Mingjia Zhi

Zhejiang University | ZJU · MSE

We present an efficient approach for the consecutive synthesis of Au-TiO2 nanocomposites with controlled morphologies in a microfluidic chip. Seed-mediated growth method was employed to synthesize Au nanorods as the...

Electrolyte design holds the greatest opportunity for the development of batteries that are capable of sub-zero temperature operation. To get the most energy storage out of the battery at low temperatures, improvements in electrolyte chemistry need to be coupled with optimized electrode materials and tailored electrolyte/electrode interphases. Here...

This work reports the synthesis of a zeolitic imidazolate framework-67 (ZIF-67) aerogel by an anion exchange method. A conventional cobalt hydroxide wet gel is prepared as the precursor. Aging of this precursor in 2-methylimidazole/methanol solution at room temperature initiates an anion exchange process in which the OH- anions in the original gel...

In this paper, a series of Au-Ru-CeO2 aerogel-based photocatalysts are constructed for the nonoxidative methane coupling reaction. A modified epoxide-adding method is employed to incorporate Au and Au-Ru nanoparticles into the CeO2 aerogel framework. While the pristine CeO2 shows negligible activity, it is found that the incorporation of Au nanopar...

In our previous work, we adopted the organic acids assisted sol–gel method to prepare ZrO2 aerogels. In preparation process, we found the organic acids with two carboxyl groups and one side group including –OH, –NH2, and –SH were prerequisite to form wet gels. Furthermore, the citric acid with three carboxyl groups and one hydroxyl group was also s...

Herein, we demonstrate the synthesis of bifunctional nickel cobalt selenide@nickel telluride (NixCo12‐xSe@NiTe) core‐shell heterostructures via an electrodeposition approach for overall urea electrolysis and supercapacitors. The 3D vertically orientated NiTe dendritic frameworks induce the homogeneous nucleation of 2D NixCo12‐xSe nanosheet arrays a...

This work reports the synthesis of CuxSny alloy aerogels for electrochemical CO2 reduction catalysts. An in situ reduction and the subsequent freeze-drying process can successfully give CnxSny aerogels with tuneable Sn contents, and such aerogels are composed of three-dimensional architectures made from inter-connected fine nanoparticles with pores...

Biomass-derived porous carbons have received an extensive importance as effective electrode materials owing to their abundance and low cost. The unique porous architectures and large specific surface areas of biomass are beneficial for manipulating the charge storage performance of assembled supercapacitor devices. Here, we demonstrate nitrogen and...

The surface plasmon resonance (SPR) effect of oxygen-deficient WO3-xhas been utilized for photocatalysis in the literature. A unique feature of WO3-xis that its plasmonic peak can be adjusted to the visible light range, which is close to that of typical plasmonic metals like Au. In this work, we have demonstrated the coupling effect of the SPR of W...

A Schottky junction is an ideal candidate for photocatalytic H2 evolution since the photo-induced charge kinetics of semiconductors can be harnessed via coupling with metals. In this work, the ZnIn2S4 semiconductor and metallic MoO2 are successfully integrated to form a composite photocatalyst, which is analogous to the conventional metal-semicondu...

This work studies KxFe0.2Mn0.8-yMgyO2 (y = 0, 0.05, 0.10, 0.15) layered oxides as the cathode of sodium-ion battery and proposes a Mg²⁺-K⁺ synergistic effect. Previous studies have proved that both K⁺ intercalation and Mg²⁺ doping can increase the diffusion coefficient of layered-oxide cathode materials. On this basis, this paper further demonstrat...

H2 is promising clean energy and electrochemical hydrogen evolution reaction offers a sustainable route compared with traditional methane steam reforming. In this work, highly porous Co2Ni and Co2Ni/reduced graphene oxide composite aerogels are prepared by a simple in-situ reduction-gelation method in an aqueous solution. The synthesis starts with...

Metal oxide aerogels have emerged as a new class of photocatalysts. As a type of 3-dimensional (3D) porous structure, an aerogel owns the characteristics of high specific surface area, tunable pore size, and large pore volume, which can distinguish itself from conventional powder or film counterparts. Such merits allow aerogels to expose more activ...

Manipulating the structure of electroactive materials with hierarchical frameworks can boost the electrochemical properties. The soaring fidelity of mixed nanostructured materials in electrochemistry verifies their candidature as appropriate electrodes for sustainable energy storage and conversion devices. Herein, we present facile and economical t...

Composite aerogels with a metallic Ag phase and a semiconductor CeO2 phase are prepared using a conventional epoxide assistant sol-gel method and ethanol supercritical drying. In such an aerogel, CeO2 nanoparticles surround Ag nanoparticles to form a continuous network for mass and charge transfer. The photocatalytic CO2 reduction reaction is studi...

Hybrid metal chalcogenides incorporating prolific redox-active transition metal selenides with optimized interactions are suitable candidates to boost the electrochemical properties of supercapacitors. The present study elaborates the design and application of selenium (Se)-enriched reduced graphene oxide hybridized heterostructured nickel bismuth...

Pseudocapacitive materials based on multi-active components are attractive platforms for future portable energy devices due to their excellent redox processes and low cost. In this study, nanostructured bismuth-iron chalcogenide anchored on multiwalled carbon nanotube frameworks (Bi-Fe chalcogenide/C) were fabricated via a simple solvothermal proto...

Highly-ranked positive electrode materials with distinct electrochemical properties and appropriate designs of heterostructured porous architectures integrating mixed transition metal selenides are necessary to boost energy storage capability, which thus have been intensively investigated in the recent years. In this work, we develop a one-step che...

Transition metal selenides have been explored as suitable candidates for sustainable energy systems. More specific, designing battery-type and capacitor electrodes with exceptional structural, compositional and physiochemical properties is of a great significance to build battery-type supercapacitor hybrid (BSH) devices with high energy and power p...

Biomass-derived porous carbons (BPCs) represents one of the most diverse classes of materials with exceptional properties such as high specific surface area, wide availability, biodegradability, low cost, and tunable porous features. A broad range of new carbon materials for suitable applications including water purification, catalyst supports and...

Pseudocapacitive materials with multiple oxidation/reduction modes can deliver an improved specific capacity and energy density owing to their reversible Faradic redox reactions. Also, ingeniously integrating a conductive carbon material and a pseudocapacitive transition metal to develop reactive compounds with a high conductivity is a plausible so...

It is of great significance to degrade antibiotics contamination by visible-light photocatalysis, however, exploiting photocatalysts with a strong visible light response, high efficiency, and stability remains a major challenge. Herein, a direct Z-scheme photocatalyst based on ZnIn2S4@MoO3 has been obtained, in which ZnIn2S4 nanosheets in-situ grow...

In this work, we report the template‐free synthesis of zinc cobalt oxides/phosphides (Co2P/CoO/ZnCo2O4) hollow sub‐micron boxes as electrocatalysts for HER (hydrogen evolution reaction). The synthesis of such sub‐micron box starts with the preparation of the hollow oxide sub‐micron box and is followed by a phosphorization process. It is proven that...

The development of effective electrocatalysts for hydrogen evolution reaction (HER) with a high performance and low-cost is greatly desirable to meet the increasing demands for sustainable energy. In this work, we herein demonstrate Au nanoparticles (NPs)-coupled Co9S8 (Au/Co9S8) aerogels with a porous feature and high surface area via a simple sol...

In terms of supercapacitor electrode materials, biomass derived carbon electrodes are gaining much attention as a viable option for practical applications. Obtaining unique carbon nanostructures can significantly promote the electrochemical performance. Waste potato peel (WPP) derived hierarchical porous carbon materials with heteroatoms doping can...

Low temperature hydrazine fuel cells have been advocated as potential energy carriers by virtue of their exceptional power densities and carbon free containing byproducts. However, the large‐scale application of these renewable energy systems has been extremely inhibited by the insufficient performance and high cost of the state‐of‐art platinum (Pt...

Asymmetric supercapacitors have emerged as one of the most appropriate energy storage systems. Enhancing the specific capacity of electrode materials at high current densities is a critical issue in asymmetric capacitors. Herein, we optimized a simple strategy to develop partial reduced hierarchical nanosheets shaped nickel-cobalt layered double hy...

Fabrication of highly reactive and cost-effective electrode materials is a key to efficient functioning of green energy technologies. Decorating redox-active metal sulfides with conductive dopants is one of the most effective approaches to enhance electric conductivity and consequently boost capacitive properties. Herein, hierarchically hollow Ag2S...

This paper reports a general electrospinning method to prepare various metal phosphide/carbon nanofibers composite for electrochemical hydrogen evolution reaction (HER) catalysts. An earth-abundant organic acid-phytic acid is successfully incorporated into a conventional electrospinning precursor as the phosphorus source, and continuous nanofibers...

Ni(OH)2 nanosheets (NSs) were grown onto an electrochemically activated carbon cloth (ECC) with a self-supported microstructure by using efficient ethanol assisted supercritical deposition method. Benefited from the structural features of the well-developed porous architecture with effective channels for electrolyte ions diffusion and accessible re...

Effective electrode design is necessary to drastically improve the performance and efficiency of sustainable energy conversion and storage devices. In this study, carbon decorated three-dimensional (3D) yolk-shelled nickel cobalt sulfide (NiCo2S4/C) hollow cages structure was synthesized by a simple one-pot method under solvothermal conditions in a...

The controllable introduction of heteroatoms into electrode materials via doping is one of the most effective strategies to realize improved electrochemical reaction kinetics and then electrochemical energy storage properties. Herein, vanadium doped nickel-cobalt layered double hydroxide nanosheet arrays (NCV-LDH NSAs) were prepared via a one-step...

Urea has shown a potential importance as a possible alternative hydrogen‐storage source for low‐temperature fuel cells. Besides, the electrooxidation of urea provides an efficient solution for the disposal of wastewater in the agricultural industry, but the state‐of‐the art urea electrocatalysis suffers from the associated sluggish kinetics. In thi...

The design of hierarchical electrodes comprising multiple components with a high electrical conductivity and a large specific surface area has been recognized as a feasible strategy to remarkably boost pseudocapacitors. Herein, we delineate hexagonal sheets‐in‐cage shaped nickel–manganese sulfides (Ni‐Mn‐S) with nanosized open spaces for supercapac...

Mixed metal sulfides with high specific capacitances and superior rate capabilities can meet the need of new materials for technological advancement of energy storage systems. We demonstrate in this study a facile fabrication of microspheres-like NixMny sulfides with different molar ratios of metallic salts through a one-step solvothermal route. Th...

The electrocatalysis of urea displays an important potential as an efficient technology for sustainable energy developments. This anodic reaction generates hydrogen or electrical power through direct electrooxidation of urea molecules, but greatly prohibited by its slow kinetics. Therefore, tailoring highly efficient, earth‐abundant, and durable el...

Sustainable and high performance energy devices such as solar cells, fuel cells, metal–air batteries, as well as alternative energy conversion and storage systems have been considered as promising technologies to meet the ever-growing demands for clean energy. Hydrogen evolution reaction (HER) is a crucial process for cost-effective hydrogen produc...

The oxygen reduction reaction is an important cathode reaction, thus seeking for low cost and high activity catalysts is highly demanded. Herein, a ternary catalyst composed of Co2P nanoparticles, N and P co-doped carbon (NPC) and CeO2 nanosheets (Co2P-NPC-CeO2) is reported for efficient oxygen reduction. In such composite, CeO2 nanosheets are coat...

Transition‐metal selenide based materials have recently aroused an increasing consideration in the field of energy reservation and conversion owing to their good electrochemical performance and low synthetic cost. Herein, multi‐walled carbon nanotubes supported binary nickel cobalt selenide composite (NiCoSe2/CNT) were prepared by a one‐pot‐hydroth...

Clean and light hydrogen fuel holds great promise for sustainable energy developments in future because of its high energy density, but, its transportation and storage represents a crucial obstacle towards scalable application. Recently, urea has aroused a considerable interest as a potential hydrogen carrier to supply renewable energy, thus, inexp...

The oxygen reduction reaction (ORR) is the key cathode reaction process in the renewable‐energy technologies. Developing high‐efficient, low‐cost, good methanol tolerant and good long‐term durable ORR catalyst is highly demanded. In this research, we reported a rather simple complexing‐coprecipitation method to synthesize CeO2 nanosheets encapsulat...

It is vital to develop oxygen evolution reaction catalyst with rational designed composition and microstructure to facilitate the overall electrochemical water splitting. In this work, uniform NixFe1-x-P nanosheets arrays are vertically grown on carbon cloth to form an effective oxygen evolution reaction catalyst. Such structure is prepared by phos...

Hydrogen evolution reaction (HER) is a crucial half-reaction of water splitting to produce possible future energy carrier: H 2 , which is directly associated with the conversion and storage of clean energy. There is a great demand on efficient earth-abundant electrocatalysts to replace Pt, especially in alkaline medium. Herein, we report Co 2 Ni al...

In this work, three-dimensional porous Ni-Co layered double hydroxide nanosheets are vertically decorated on N-doped reduced graphene oxide via a simple one-step microwave-assisted hydrothermal process. The incorporated N-doped reduced graphene oxide brings the following advantages: firstly, the improved hydrophilicity of the N-doped reduced graphe...

This work reported the preparation of amorphous MoSx aerogel and MoSx/carbon nanotubes composite aerogels by a modified epoxide addition sol–gel method. In this process, propylene epoxide scavenged the protons from a S–H-contained organic acid (dl-Mercaptosuccinic acid) and promoted the interactions between (NH4)6Mo7O24•4H2O and the functional grou...

This work reports the synthesis of coaxial carbon@NiMoO4 nanofibers for supercapacitor electrode applications. Thin NiMoO4 nanosheets are uniformly coated on the conductive electrospun carbon nanofibers by a microwave assisted hydrothermal method to form a hierarchical structure, which increases the porosity as well as the conductivity of the elect...

Great efforts have been devoted on searching for sustainable and earth-abundant precursors to prepare activated carbon suitable for supercapacitor electrode applications. In this paper, we demonstrated the preparation of mesoporous carbon nanofiber network (~ 10 nm in diameter of the nanofibers) from agarose precursors. With the aid of zinc acetate...

We reported the preparation of a series of ZrO2-SiO2 composite aerogels via the sol-gel reaction between the zirconium source (ZrOCl2·8H2O) and the gel initiator (mercaptosuccinic acid-triethoxyvinylsilane). Such novel gel gelator was prepared by the thiol-ene click reaction using triethoxyvinylsilane (VTES) and mercaptosuccinic acid (MSA). The uni...

This work reported Co9S8 nanoparticle-decorated carbon nanofibers (CNF) as a supercapacitor electrode. By using a mild ion-exchange method, the cobalt oxide-based precursor nanoparticles were transformed to Co9S8 nanoparticles in a microwave hydrothermal process, and these nanoparticles were decorated onto a carbon nanofiber backbone. The compositi...

In this study, Ni-Al layered double hydroxide (NiAl-LDH) hollow microspheres with a high surface area and large pore volume were prepared using Al2O3 hollow microspheres composed of Al2O3 nanosheets as templates. During a mild microwave-assisted hydrothermal process, the Al2O3 nanosheets transformed to NiAl-LDH nanosheets without any damage to the...

This work introduces anion exchange method into the sol-gel process for the first time to prepare metal sulfide aerogel. Porous Co9S8 aerogel with the high surface area (274.2 m2/g) and large pore volume (0.87 cm3/g) has been successfully prepared by exchanging Cobalt citrate wet gel in thioacetamide and subsequently drying in supercritical ethanol...

Zirconia aerogel monolith was prepared by a facile co-hydrolysis method, which adopts ZrOCl2 as the precursor and water glass (Na2SiO3) as the gel initiator. ZrO2 aerogel was formed by rational controlling of the hydrolysis rate of Zr⁴⁺ ions by Na2SiO3. The obtained aerogel consists of ZrO2 nanoparticles surrounded by amorphous SiO2 nano shell. The...

In our previous work, a citric acid assisted sol–gel method was developed for preparing monolithic metal oxide aerogels. Such method adopted citric acid as the gelator, which replaced the well-studied proton scavenger propylene oxide. In this work, we have further extended this “organic acid assisted” sol–gel method and investigated the gelation me...

Monolithic micro-nano yttria-stabilized ZrO2 (YSZ)-Al2O3 composite aerogel composed of Al2O3 hollow microspheres which was filled with YSZ nanoparticles was prepared by one-step sol-gel process. Such aerogel-like microstructure combined the advantages of good high temperature tolerant property of Al2O3 hollow microspheres and favorable thermal insu...

We report the synthesis of porous NiCo2S4 and NiCo2S4-reduced graphene oxide composite aerogel with high surface area (up to 262.4 m²/g) and large pore volume (up to 1.44 cm³/g). The aerogel is prepared by “DL-Mercaptosuccinic acid accelerated” sol-gel method, which is different from the well-established “nanoparticle condensation” and “metathesis”...

Monolithic NiO aerogels were prepared by a facile citric acid assisted sol-gel method for supercapacitor electrodes. The highly porous aerogel microstructure is composed of a rigid nanoparticle backbone, which offers a large number of surface active sites for pseudocapacitive reactions and a high pore volume to facilitate ion transfer. As a result,...

TiO2 nanofibers (TNFs) with different anatase/rutile phase ratios were fabricated using electrospinning technique followed by the annealing at different temperatures. The effect of annealing temperatures on their morphology, structural, and optical properties and photocatalytic activity was investigated. The photocatalytic performance of TNFs was e...

Harvesting mechanical energy from biological systems possesses great potential for in vivo powering implantable electronic devices. In this paper, a development of flexible piezoelectric nanogenerator (NG) is reported based on mesoporous poly(vinylidene fluoride) (PVDF) films. Monolithic mesoporous PVDF is fabricated by a template-free sol–gel-base...

Two new quaternary thioarsenates(III) NaAg2AsS3·H2O (1) and KAg2AsS3 (2) with high yields have been successfully prepared through a facile surfactant-thermal method. It is interesting that 2 can only be obtained with the aid of ethanediamine (en), which indicates that weak basicity of solvent is beneficial to the growth of 2 compared with 1. Both 1...

Two new quaternary thioarsenates(III) SrAg4As2S6*2H2O (1) and BaAgAsS3 (2) have been prepared through hydrazine-hydrothermal method at low temperature. Compound 1 possesses the two-dimensional (2D) layer network, while compound 2 features the one-dimensional (1D) column structure. The detailed structure analysis indicates that Sr2+ and Ba2+ cations...

A facile solvothermal method combined with heat treatment was introduced to obtain enhanced photocatalytic activity of TiO2@C/RGO (reduced graphene oxide) photocatalyst under the visible light. By adjusting the annealing temperature, the physical and chemical status of interfacial carbonaceous layer could be successfully tuned. The carbonaceous lay...

Two isostructural quaternary chalcogenidoantimonates(III) BaCuSbQ3 (Q = S, Se): BaCuSbS3 (1) and BaCuSbSe3 (2) have been successfully synthesized through a facile hydrazine-hydrothermal method. Both two compounds crystallize in the orthorhombic space group and feature a three-dimensional (3D) channeled [Cu2Sb2Q6]4- framework, which is constructed b...

In this study, one-dimensional (1D) uniform Cu(OH)2 nanobelts have been synthesized by a facile wet chemistry method. The effect of different synthesis parameters on the morphologies of the target products was systematically studied. The uniform nanobelts can be easily controlled by different reaction time and temperature, while the quantity of amm...

Facile synthesis of porous and high conductive materials is highly desirable for supercapacitor electrode application. In this work, hierarchical porous CoMn(CoMn)2O4 spinel coated on reduced graphene oxide (rGO) was synthesized successfully through mixed solvothermal process followed by calcination. By adjusting the solvent ratio of dimethyl forma...

Three new quaternary thioantimonates(III) ACu2SbS3 (A = K, Rb, Cs) have been prepared through the surfactant-thermal method. X-ray single crystal diffraction analysis reveals that these three compounds are isostructural and feature a two-dimensional layered structure. Both experimental and theoretical studies conrm they are semiconductors with narr...

A facile and general strategy for the synthesis of yttria-stabilized zirconia (YSZ) aerogels was developed by using citric acid as a gelation accelerator. This is a low-cost, nontoxic approach to prepare zirconia based aerogels which have important application potential in catalysis and insulation materials.

Two novel porous three-dimensional (3D) quaternary ACuSb2S4 (A = Rb, Cs) were successfully synthesized by employing the neutral surfactant PEG-400 (PEG = polyethyleneglycol) as reaction media, which are totally different from the known quaternary A-Cu-Sb-S thioantimonates(III) with two-dimensional (2D)crystal structures. This is the first time to p...

The two new quaternary thioantimonates(III) BaAgSbS3 (1) and BaAgSbS3·H2O (2) have been synthesized through a hydrazine-hydrothermal method at low temperature. Compound 1 possesses a two-dimensional (2D) layer structure, while compound 2 features a three-dimensional (3D) channel framework. The optical band gaps of 1 and 2 are approximately 2.2 and...

Facile synthesis of porous and hollow spinel materials is highly desirable for their extensive applications in energy storage fields. In this work, uniform and decentralized flower-like CoMn2O4 microspheres were synthesized and characterized for supercapacitor electrodes in neutral aqueous electrolyte. In this contribution, uniform microspheres pre...

The porous activated carbon nanofibers have been prepared by electrospinning H3PO4-containing polyacrylonitrile precursor. A small amount of H3PO4 (<1 wt%) serves as the activation agent during carbonization of nanofibers. The activated carbon nanofibers have a large surface area (~709 m2/g) and high porosity (0.356 cm3/g). High specific capacitanc...

It is important to address the challenges posed with the ever-increasing demand for energy supply and environmental sustainability. Activated carbon, which is the common material for commercial supercapacitor electrodes, is currently derived from petroleum-based precursors. This paper presents an effective synthetic method that utilizes waste tires...

In this work, one-dimensional TiO2(B)@anatase heterostructure nanocomposites were synthesized via a facile hydrothermal process in ethanol/water solution with the aid of polyvinylpyrrolidone. TiO2(B) nanobelts were uniformly coated with an anatase nanocrystals shell. The shell thickness can be tuned from 10 nm to 30 nm. The energy bandgap at the he...

Molybdenum disulfide (MoS2) is a promising candidate for solar hydrogen generation but it alone has negligible photocatalytic activity. In this work, 5-20 nm sized p-type MoS2 nano-platelets are deposited on the n-type nitrogen-doped reduced graphene oxide (n-rGO) nanosheets to form multiple nanoscale p-n junctions in each rGO nanosheet. The p-MoS2...

The conventional sensor calibration aims at mathematically relating the steady-state sensor responses to the target analyte concentrations to realize environment monitoring. However, commonly used chemical sensors usually require a relatively long time (say, minutes) to reach a steady state, and exhibit delayed responses when the analyte concentrat...

The photocatalytic water oxidation activity of hematite (α-Fe2O3) has been greatly enhanced by incorporating hematite nanoparticles on the reduced graphene oxide (rGO) nanosheets. Photoelectrochemical measurement results show that coupling the hematite nanoparticles with the rGO greatly increases the photocurrent and reduces the charge recombinatio...

20 nm sized Co3O4 nanoparticles are in-situ grown on the chemically reduced graphene oxide (rGO) sheets to form a rGO–Co3O4 composite during hydrothermal processing. The rGO–Co3O4 composite is employed as the pseudocapacitor electrode in the 2 M KOH aqueous electrolyte solution. The rGO–Co3O4 composite electrode exhibits a specific capacitance of 4...

In order to generate hydrogen by splitting water under visible-light irradiation, nitrogen-doped La2Ti2O7 (LTO) nanosheets loaded with the Pt nanoparticles have been synthesized by hydrothermal processing, followed with wet impregnation and subsequent heat treatment in a NH3 flow. The light absorption of the pristine LTO nanosheets is cut off at 33...

This paper presents a review of the research progress in the carbon-metal oxide composites for supercapacitor electrodes. In the past decade, various carbon-metal oxide composite electrodes have been developed by integrating metal oxides into different carbon nanostructures including zero-dimensional carbon nanoparticles, one-dimensional nanostruct...

TiO2 nanobelts (NBs) and nanoparticles (NPs) have been coupled with the chemically reduced graphene oxide (rGO) to form nanocomposites which are used as supercapacitor electrodes. The specific capacitance of rGO–TiO2 composites is higher than that of monolithic rGO, TiO2 NPs or NBs. The optimal electrochemical performance is achieved with the rGO–T...

Plasmonic metal nanostructures have been incorporated into semiconductors to enhance the solar-light harvesting and the energy-conversion efficiency. So far the mechanism of energy transfer from the plasmonic metal to semiconductors remains unclear. Herein the underlying plasmonic energy-transfer mechanism is unambiguously determined in Au@SiO(2)@C...

Lanthanum strontium manganite (La(0.8)Sr(0.2)MnO(3), LSM) nanofibers have been synthesized by the electrospinning method. The electrospun nanofibers are intact without morphological and structural changes after annealing at 1050 °C. The LSM nanofibers are employed as the sensing electrode of an electrochemical sensor with yttria-stabilized zirconia...

This paper presents highly conductive carbon nanofiber/MnO2 coaxial cables in which individual electrospun carbon nanofibers are coated with an ultrathin hierarchical MnO2 layer. In the hierarchical MnO2 structure, an around 4 nm thick sheath surrounds the carbon nanofiber (CNF) in a diameter of 200 nm, and nano-whiskers grow radically outward from...

Lanthanum strontium cobalt ferrite (LSCF) nanofibers have been fabricated by the electrospinning method and used as the cathode of an intermediate-temperature solid oxide fuel cell (SOFC) with yttria-stabilized zirconia (YSZ) electrolyte. The three-dimensional nanofiber network cathode has several advantages: (i) high porosity; (ii) high percolatio...

Approximately 15 nm thick nitrogen-doped lanthanum titanate (La2Ti2O7) nanosheets with a single-crystalline perovskite structure have been prepared by hydrothermal processing and subsequent heat treatment in NH3 at 600 °C. Doping nitrogen into the La2Ti2O7 nanosheets results in the narrowing of the band gap, extending the light absorption into the...

A high performance solid oxide fuel cell cathode using the yttria-stabilized zirconia (YSZ) nanofibers scaffold with the infiltrated La1-xSrxMnO3 (LSM) shows an enhanced catalytic activity toward oxygen reduction. Such a cathode offers a continuous path for charge transport and an increased number of triple-phase boundary sites.

TiO2 nanostructures with various morphologies and crystal structures were obtained by calcination of alkaline hydrothermal synthesized hydrogen titanate at different temperatures. The photocatalytic activities of the as-prepared samples were investigated by degradation of methyl orange aqueous solution under ultraviolet irradiation. The effects of...