Yongdan Li

Aalto University · Chemcial & Metallurgical Engineering

Developing high-performance catalyst is of paramount for NO direct decomposition. Here, composite catalysts BaMnO3-CeO2 were designed and prepared by the one-pot method, which show high catalytic activity, oxygen resistance and durability. The NO conversion to N2 of 85.9% at 800 oC is achieved for 5%BaMnO3-CeO2. It exhibits 66.5% activity in the pr...

A lithium oxygen battery (LOB) with molten salt electrolyte operating at elevated temperature has aroused great interest because it enables fast reaction kinetics. However, there is still a lack of open literature on the separator (membrane) of this kind of LOB. Metal‐organic framework (MOF) materials are widely used as components of separators in...

The cathode of a lithium-oxygen battery (LOB) should be well designed to deliver high catalytic activity and long stability, and to provide sufficient space for accommodating the discharge product. Herein, a facile coprecipitation approach is employed to synthesize LaNi0.5Co0.5O3 (LNCO) perovskite oxide with a low annealing temperature. The assembl...

CO 2 perm-selective ceramic/carbonate dual phase membranes are promising in a number of high temperature separation and reaction processes for CO 2 capture or process intensification. The stability of these membranes in gas containing SO 2 is important for their applications dealing with sulfur containing stream. The present work studies gas permea...

A metal-free route based on a carbon catalyst to synthesize biphenyls through oxidative dehydrogenation (ODH) of phenyl cyclohexene has been investigated. Among the samples examined, an air-oxidized active carbon exhibits the best activity with a 9.1 × 10-2 h-1 rate constant, yielding 74% biphenyl in 28 h at 140 °C under five bar O2 in anisole. The...

Ni-based cermets are the most widely used anode materials for solid oxide fuel cells. Reducing the content of Ni is beneficial to anode stability but usually unfavorable for the catalytic activity. In this study, Ni-Ce0.8Sm0.2O2-δ anode with a low Ni content is synthesized through a polymer-directed evaporation-induced self-assembly strategy. Ni di...

CO2 emission is deemed to be mainly responsible for global warming. To reduce CO2 emissions into the atmosphere and to use it as a carbon source, CO2 capture and its conversion into valuable chemicals is greatly desirable. To reduce the transportation cost, the integration of the capture and utilization processes is a feasible option. Here, the rec...

Wadsley–Roth phase titanium niobium oxides have received considerable interest as anodes for lithium ion batteries. However, the volume expansion and sluggish ion/electron transport kinetics retard its application in grid scale. Here, fast and durable lithium storage in entropy‐stabilized Fe0.4Ti1.6Nb10O28.8 (FTNO) is enabled by tuning entropy via...

The dissolution and solvolysis processes of enzymatic hydrolysis lignin (EHL) in ethylene glycol are investigated. Ethylene glycol exhibits high EHL solubility and achieves complete EHL dissolution at room temperature. Gaussian simulation reveals that van de Waals interactions between ethylene glycol and EHL, including C-H⋯O and lone pair⋯π interac...

In this study, exhausted olive pomace (EOP) biochar prepared by carbonization at 400 ◦C is investigated as a fuel in a direct carbon fuel cell (DCFC) with an electrolyte-supported configuration. The feasibility of using the EOP biochar in the DCFC is confirmed, showing a maximum power density of 10 mW·cm−2 at 700 ◦C. This limited DCFC performance i...

A 5 wt% BaMnO3-CeO2 composite catalyst prepared by the one-pot method exhibits extraordinary catalytic performance for nitrogen monoxide (NO) direct decomposition into N2 and O2; however, the reasons for the high activity remain to be explored. Here, the catalyst was prepared by mechanical mixing and then subjected to thermal treatment at different...

h i g h l i g h t s g r a p h i c a l a b s t r a c t Z scheme graphitic carbon nitride-anodic TiO 2 nanotubes (C 3 N 4-TNT) is prepared. Polarization curve of C 3 N 4-TNT is recorded in a broad potential, À0.5 À 2.5 V RHE. C 3 N 4-TNT shows enhanced light absorption and promoted charge carrier separation. The effect of potential and solar light on...

Redox flow battery (RFB) has been widely considered to be one of the most promising grid-scale energy-storage technology. The membrane, namely separator, serves as preventing the crossover of the positive and negative active species, while facilitating the transport of the supporting electrolyte ions, is crucial to achieve a high performance and a...

A crucial challenge in the commercialization of Ni-based materials as the anode of solid oxide fuel cell is the fast voltage drop due to carbon deposition and structural degradation during cell operation. Herein, Sn-doped Ce0.8Sm0.2O2-δ (SDC) supported Sn-Ni alloy anode is rationally designed and prepared, via a simple and convenient dual-modificat...

Pd/SSZ-13 catalysts were investigated for the simultaneous storage of NO and C3H6 at 100 °C. The effects of the state of Pd species on co-adsorption and release were studied under simulated exhaust conditions. The catalysts were characterized by NH3-TPD, XRD, and TEM for Pd²⁺ and PdO species. NO adsorption/release behavior is impacted by the nature...

Rechargeable lithium-oxygen (Li-O2) batteries have been regarded as a promising energy storage device, but its practical use is impeded by its low energy efficiency. Herein, a bi-functional catalytic perovskite LaNi0.5Co0.5O3 (LNCO) is employed as the cathode of an efficient Li-O2 battery with a molten nitrate salt electrolyte at 160 oC. It display...

Nonaqueous redox flow batteries (NARFBs) have the potential as high-energy-density electrochemical storage systems due to their wider electrochemical windows compared with their aqueous counterpart. Before possible commercial application, three major performance metrics (energy density, power density, and cycling stability) of NARFBs need to be imp...

The metallic cobalt supported on nitrogen dopped carbon material was employed as an efficient catalyst in the oxidative esterification of 5-hydroxymethylfurfural (HMF) to furan-2,5-dimethylcarboxylate (FDMC). The carbonization temperature has a significant effect on the morphology and structure of Co/N-C samples. The Co/N-C calcined at 900 oC exhib...

The high temperature hydrothermal stability in the presence of SO2 of the one-pot synthesized Cu-SSZ-13 was investigated for selective catalytic reduction of NOx by NH3 (NH3-SCR). The uncalcined samples were treated with HNO3 (pH = 1.0-1.1) with different duration (3, 6, and 9 h) and then calcined, finally subjected to 750 oC hydrothermal aging wit...

The second-generation biofuel strategy aims to fully utilize lignocellulose, which is the major component of the plant cell wall and the most abundant form of renewable organic resources. Among three major components of lignocellulose, i.e. cellulose, hemicellulose and lignin, lignin has been the least utilized one up to now. Nevertheless, lignin d...

A thin yttria stabilized zirconia (YSZ)/gadolinia doped ceria (GDC) bi-layer membrane is fabricated through the slurry spin coating technique and used as an electrolyte of a solid oxide fuel cell with La0.6Sr0.4Co0.2Fe0.8O3-δ as the cathode. The viscosity of the YSZ slurry is controlled by adding ethanol in the terpineol solvent, which shows a negl...

Low selectivity and complex product distribution are the main challenges for the utilization of lignin. Herein, the selective production of 2-(tert-butyl)-3-methylphenol (TBC), an antioxidant in the polymer industry, from depolymerization of enzymatic hydrolysis lignin (EHL) on a hydrothermally synthesized MoS2 catalyst is studied. The total aromat...

A Mo(OCH2CH3)x/NaCl catalyst showed high efficiency in supercritical ethanol without adding H2 in the conversion of Kraft lignin to chemicals, including C6 alcohols, C8-C10 esters, benzyl alcohols and arenes. Control experiments were done with MoCl5, NaOC2H5 and the physical mixture of them. The Mo(OCH2CH3)x/NaCl catalyst exhibited superior activit...

Developing low-cost, efficient and stable metal oxide cathode catalyst for hydrogen evolution reaction (HER) is of great importance to overcome the major challenge in photoelectrochemical water splitting (PECWS) cell. Anodic titanium dioxide nanotube (TNT) as the electrode has shown promising for its flexibility, economy and efficiency. Herein, a h...

Nonaqueous redox flow batteries (NARFBs) hold great promise to offer high energy density due to the broader electrochemical window. However, the achieved energy density is relatively low due to the poor stability and low solubility of redox active materials. Herein, we demonstrate that N-substituted naphthalimides can be employed as stable anolyte...

The depolymerization of enzymatic hydrolysis lignin (EHL) is examined over one-step hydrothermal-synthesized MoS2 in ethanol without hydrogen gas. Value-added aromatic molecules, mainly including alkyl-substituted phenols (A-Ps), are obtained without char or tar formation. The MoS2 samples prepared with different Mo and S precursors have been teste...

A series of hydroxyapatite (HAP) supports with different Ca/P ratios were synthesized to prepare the MnOx/HAP catalysts. A MnOx/HAP catalyst showed highly efficient conversion of 5-hydroxymethylfurfural (HMF) into 2, 5-diformylfuran (DFF) in toluene solvent under no-alkali condition. 86.4% conversion of HMF with 90.9% selectivity of DFF at 120 °C f...

The cobalt nanoparticles embedded into graphitic nitrogen-rich carbon nanotube (Co/GCN) was prepared with a facile method and employed as an efficient catalyst for oxidative esterification of 5-hydroxymethylfurfural (HMF). The introduction of N species to carbon benefits the synergistic effects between Co nanoparticles and nitrogen-doped carbon nan...

Sluggish anode kinetics and serious carbon deposition are two major obstacles to developing hydrocarbon fueled solid oxide fuel cells. A highly active and stable perovskite La0.5Ba0.5FeO3-δ anode material is studied in this work. The oxygen surface exchange and charge transfer steps are the rate-determining steps of the anode process, and the forme...

Developing high-performance catalyst is of paramount importance for NO direct decomposition. Here, composite catalysts BaMnO3-CeO2 were designed and prepared by the one-pot method, which show high catalytic activity, oxygen resistance and durability. The NO conversion to N2 of 85.9% at 800 oC is achieved over 5%BaMnO3-CeO2. It exhibits 66.5% activi...

NASICON-type solid-state electrolyte is characterized by high electrical conductivity but its application in all-solid-state battery is limited by the high sintering temperature and poor interface contact with the electrodes. Here, solid-state reactive sintering, without intermediate calcination and ball-milling steps and no sintering additive, is...

Developing highly efficient and robust electrocatalysts for oxygen evolution reaction (OER) is critical to renewable energy technologies. Here, we report an effective strategy to enhance the OER activity of a perovskite electrocatalyst through improving the electrical conductivity introduced by the structural transition. La0.7Sr0.3Fe1−xNixO3−δ (den...

α-Fe2O3-Bi2S3 nanorods was successfully synthesized via a hydrothermal route with incorporation of graphene obtained from the pyrolysis of alginate, and was employed as a catalyst of the degradation of benzotriazole (BTA) in a photo-Fenton process. Due to the unique combination of graphene and the binary α-Fe2O3-Bi2S3 nanorod, the sample with 3wt%...

Anodic TiO2 nanotube (TNT) films show promises for photon-driven catalytic, electricity storage and chemical processes. The film thickness of anodic TNT is known to affect its performance in optical and electronic applications. Also, factors affecting the morphology and dimensions of anodic TNT films are rather well-known. However, the knowledge on...

Anodic TiO2 nanotube (TNT) arrays have been intensively investigated as anodes in water splitting (WS) cells because of their excellent chemical stability. However, anodic TNT is seldom considered as a cathode for the hydrogen evolution reaction (HER) in an electrochemical WS cell. This study shows that a reduced TNT (R-TNT) sample prepared with a...

Non-aqueous redox flow batteries (NARFBs) are promising in the grid-scale energy storage for the harvesting of the intermittent renewable power sources. However, the lack of efficient separator is still impeding their further development. A flexible nanoporous separator is prepared through a “rolling dough” strategy, with zinc metal-organic framewo...

CuCe0.8La0.1Sm0.1O2-δ and CuCe0.8Nd0.1Sm0.1O2-δ are studied as anode materials for solid oxide fuel cells with methanol as fuel. The oxygen surface exchange and bulk diffusion coefficients of Ce0.8Sm0.2O2-δ both increase with La and Nd doping. The CH3OH temperature-programmed surface reaction results show that the addition of La and Nd accelerates...

Anodic TiO2 nanotube (NT) array is promising for the flexible and efficient photoanode in photoelectrochemical water splitting (PECWS) cell. However, the photocurrent response of pristine anodic TiO2 NT photoanode in literature has a ca 50 times difference, viz. from 0.05 to 1 mA/cm². Improvement of the pristine TiO2 NT is the base for achieving a...

Amorphous nickel oxide loaded on nickel foam (a-NiOx/NF) is synthesized via a facile photochemical metal-organic deposition (PMOD) approach and evaluated as catalyst for urea oxidation reaction (UOR). It exhibits superior activity with current density of 1 and 10 mA cm−2 at 1.240 (0.002) and 1.256 (0.001) V vs. RHE in 1.0 M KOH and 0.5 M urea solut...

The non-aqueous redox flow batteries (NARFBs) are promising for large-scale energy storage. However, the crossover contamination of active materials seriously imparts the performance. Here, two-dimensional (2D) vermiculite nanosheets modified Celgard porous membrane is prepared by the filtration method. The 2D vermiculite nanosheet layers stacked o...

Redox flow battery (RFB) is promising in grid-scale energy storage, and potentially applicable for facilitating the harvest of the intermittent renewable power sources, like wind and solar, and stabilizing the power grid. Early RFBs are based on aqueous electrolytes and the all-vanadium as well as Zn/Br systems have been demonstrated in close comme...

The effects of SO2 on an one-pot synthesized Cu-SSZ-13 catalyst for selective reduction of NOx by NH3 were examined. The addition of SO2 inhibited NOx conversion significantly below 300 oC, while no effect on NOx conversion was observed above 300 oC. TGA, TPD, and XPS results showed that the deactivation was caused by the formation of (NH4)2SO4, SO...

The 5%BaCoO3-CeO2 catalysts show excellent catalytic performance for NO direct decomposition; however, the reasons for the high activity remain to be explored. Here, the catalyst was prepared by different methods (citric acid-nitrate one-pot method, impregnation method and mechanical mixing method), aiming to reveal the factors determining the cata...

BaCe0.2Fe0.8-xPrxO3-δ (x = 0–0.3) is studied as a cobalt-free cathode material for proton-conducting solid oxide fuel cells. The cathode is composed of a cubic BaFeO3-δ phase and an orthorhombic BaCeO3-δ phase, and Pr is doped in both phases. The partial substitution of Pr for Fe decreases the content of the BaFeO3-δ phase, leading to a lower elect...

Azobenzene (azoB) is a promising anode active material for nonaqueous redox flow battery (NARFB), but the battery performance assembled with azoB is rather poor. Here, we show that the rate performance of NARFB with azoB and 2,5-di-tert-butyl-1-methoxy-4-[2′-methoxyethoxy] benzene (DBMMB) as anolyte and catholyte active materials can be significant...

The high value-added products such as alkyl substituted phenols (A-Ps) are very important from lignin-derived feedstocks. Herein, the selective conversion of guaiacol, an important chemical of lignin-derived bio-oil, to A-Ps over hydrothermally synthesized bulk MoS 2 (HT-MoS 2) was examined under supercritical methanol conditions without any gaseou...

The chemistry during the preparation of Pd/SSZ-13, including impregnation and calcination process, was investigated, using Pd(NO3)2 as precursor and NH4-SSZ-13 as the support. Special attention was paid on analyzing the improvement effect of NH4-SSZ-13 support on Pd²⁺ ions dispersion. The Pd(NO3)2 precursor remained intact after impregnation and tr...

The surface properties of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) perovskite electrode are modified with HNO3 treatment to improve its catalytic activity towards oxygen reduction reaction between 500–650 °C. The surface concentrations of A-site cations are reduced after the acid etching. After the calcination at 1150 °C, severe segregation of Sr is observe...

NO direct decomposition is deemed as the ideal technology to diminish NO from exhaust waste owing to its cost-effectiveness and eco-friendliness characteristics. However, its wide application is seriously impeded by the low activity and stability of catalysts under the real conditions. Here, the advances of catalysts for NO direct decomposition hav...

The Pd/SSZ-13 with the same Pd loading (1 wt.%) but different Si/Al ratio (6 and 13) were hydrothermal aged at 800, 850, and 900 ºC, respectively. The Pd/SSZ-13 with a lower Si/Al ratio suffers a more severe deactivation. The Pd/SSZ-13 with a Si/Al ratio of 6 experiences structural damage due to dealumination, while the structure of the sample with...

Anthraquinone (AQ)-based materials are promising active materials for aqueous redox flow batteries (ARFBs) owing to their fast kinetics and reversible two-electron redox reactions, but their application in non-aqueous RFBs (NARFBs)...

The crossover of anolyte and catholyte during cycling places a serious obstacle for the performance of non-aqueous redox flow batteries (NARFBs). Employing symmetric RFB is an effective strategy to alleviate this issue. A new bi-redox material, 1-(ferrocenylmethyl-amino)-anthraquinone (FcMeAAQ) composed of ferrocene and anthraquinone two moieties,...

The efficient depolymerization and hydrodeoxygenation of enzymatic hydrolysis lignin are achieved in cyclohexane solvents over a gamma-alumina supported nickel molybdenum alloy catalyst in a single step. Under initial 3 MPa hydrogen at 320 °C, the highest overall cycloalkane yield of 104.4 mg/g enzymatic hydrolysis lignin with 44.4 wt% selectivity...

Ce oxide-based catalysts with different molar ratio of Co/Ce (denoted as CoCe-x, x represents the Co to Ce ratio) were examined as the catalyst of 5-hydroxymethylfurfural (5-HMF) oxidation to 2,5-furandicarboxylic acid (FDCA). The Co to Ce ratio, catalyst amount and reaction temperature all have remarkable effects on yield and selectivity. Complete...

In recent decades, catalysis has witnessed increasing interests in many catalytic reactions with bulk phase and interface charge transfer steps as a distinguished feature. Here, the charge can be cations, anions, electrons or holes. Research into both bulk phase and interface charge transfer has changed our understanding and in-focus design of cata...

Selective oxidation of 5-hydroxymethylfurfural (HMF) to 2, 5-diformylfuran (DFF) with molecular oxygen is realized with an α-MnO2 catalyst under mild conditions. In this work, α-MnO2 exhibited the best performance among the samples examined. Meanwhile, solvent shows a significant effect on the product selectivity and isopropanol is found good for i...

The Cover Feature shows the catalytic NO direct decomposition reaction with BaCoO3‐CeO2 catalysts synthesized by a one‐pot method. In their Full Paper, P. Xie et al. present durable catalysts of superior activity and robust oxygen resistance. Their performance is ascribed to the microstructure obtained through the citric acid‐nitrate one‐pot synthe...

NO direct decomposition is the most promising but also the most challenging approach for nitrogen oxides mitigation. Developing high performance catalysts is greatly desirable to promote the application of this technology. The present catalysts BaCoO3−CeO2 prepared by the one‐pot method show superior activity towards NO direct decomposition, robust...

An improved SOFC anode with excellent stability against carbon deposition with syngas as fuel is reported. The anode material is Ni–La0.8Sr0.2FeO3 (LSF) composite synthesized by anhydrous impregnation. After reduction in wet H2 (3% H2O), the material partially decomposes to SrLaFeO4 and exsolved Fe. The exsolved Fe forms Ni–Fe alloy with impregnate...

The influence of SO2 presence during high temperature hydrothermal aging (600, 700, and 800 °C) on the performance of Cu-SSZ-13 prepared by the conventional ion-exchange method for selective catalytic reduction of NOx by NH3 (NH3-SCR) was studied. The high-temperature activity of Cu-SSZ-13 is obviously enhanced by the SO2 presence for the 700 and 8...

La0.5Ba0.5Mn1-xCoxO3-δ (x < 0.4) with a perovskite structure is studied as a cathode material for solid oxide electrolysis cells. The exsolution of metallic Co from the perovskite in a reducing atmosphere is in situ investigated. Co improves the electrical conductivity of La0.5Ba0.5MnO3-δ in a reducing atmosphere, and facilitates the oxygen exchang...

The amorphous Co-Ce binary metal oxides Co1-yCeyOx prepared by the photochemical metal–organic deposition (PMOD) method is developed as high performance electrocatalysts for oxygen evolution reaction (OER). The influence of Ce content on the OER activity is investigated in terms of geometric and electronic factors. Ce can remarkably enhance the OER...

Lignin represents the largest renewable source of aromatic compounds in nature, and the production of value-added aromatic compounds from lignin can reduce the dependence on fossil feedstocks. Here, a number of unsupported nickel-based catalysts were prepared from the decomposition of nickel formate, and were employed for the depolymerization of en...

Ni/Ce0.8Sm0.2O1.9 (SDC) with a three-dimensionally ordered macroporous (3DOM) structure is prepared with poly(methyl methacrylate) as the template and characterized using X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, H2 temperature-programmed reduction, X-ray photoelectron spectroscopy and ultraviolet Ram...

Ni–Ce0.8PrxSm0.2-xO2-δ (x = 0–0.15) is studied as an anode of solid oxide fuel cells. The doping of Pr facilitates the chemical oxidation of CH3OH on the ceramic phase because the strength of Pr–O bond is weaker than that of Ce–O bond. With the addition of Pr, the electronic conductivity of the ceramic phase increases in an oxidizing atmosphere but...

La0.9Sr0.1CoO3 perovskite oxides were prepared by a hard template and a sol-gel method, respectively. The catalytic activities for oxidation of CO and C3H6 were examined. XRD, BET, TEM, TPR, and TGA techniques have been used to characterize structural properties, reducibility, mobility of lattice oxygen, and oxygen release rate. La0.9Sr0.1CoO3 synt...

A novel carbon-chain increasing valorization of furfural (FUR), a cheap bio-based platform compound, has been successfully performed via the catalytic oxidative condensation process with mono-dispersed palladium oxide catalyst. For the reaction of furfural, n-propanol and O-2, the PdO@TiO2 exhibited a prominent catalytic activity in which a 77.8% c...

The distribution of framework Si and Al in the Cu-SSZ-13 catalyst, for NH3 selective catalytic reduction of NOx, is manipulated via a new strategy, using SAPO-34 as a seed in hydrothermal synthesis instead of the conventional SSZ-13 micro-crystallite. The SAPO-34 seed has a strong impact on the hydrothermal stability of the catalyst, moderating the...

A one-pot process for the depolymerization of lignin-rich corncob residue (LRCR) is investigated in supercritical ethanol over an alumina supported NiMo (NiMo/Al) alloy catalyst. The LRCR, as a major by-product in corncob enzymatic hydrolysis process, was completely liquefied and effectively transformed into aromatic compounds without the formation...