Rini Singh

Hiroshima University | HU · Graduate School of Advanced Science and Engineering

Iron Phosphide (Fe2P) particles embedded within in-situ generated tubular carbon structures uniformly doped with nitrogen heteroatoms (Fe2P @ NC) have been investigated as an anode in all-solid-state lithium-ion batteries (ASSLIBs). The designed morphology offered a number of suitable features, such as high conductivity, robust framework, and abund...

The irradiation-induced effects of Ni7+ ion irradiation on the structural and electrical properties of e-beam evaporation synthesized Bi2Te3 thin films have been examined. X-ray Diffraction (XRD) results revealed that the films possessed a polycrystalline rhombohedral (R-3 m) crystal structure. No appreciable change was observed in lattice paramete...

The superior hydrogen storage properties makes the KSiH3 system a potential hydrogen storage material for practical applications. A theoretical capacity of 4.3 wt% bring this material to the front line of all the available hydrogen storage materials; however, the activation barrier of the reaction restricts the system to absorb and desorb hydrogen...

Invoking defects with ion implantation is an attractive means to modify the physical parameters of materials. In the present work, Cu ions at fluence (1 × 1015 ions cm−2) with 100 keV energy were implanted on BiSbTe3 (BST) single crystals. The X-ray diffraction (XRD) measurements on pristine and Cu ion-implanted crystals demonstrate a decrease in l...

Electrochemical energy storage is considered a remarkable way to bridge the gap between demand and supply due to intermittent renewable energy production. All-solid-state batteries are an excellent alternative and are known to be the safest class of batteries. In the present scenario to accomplish the energy demands, high-capacity and stable anodes...

Breaking of time reversal symmetry in 3D topological insulators and tuning of Fermi level in the vicinity of the Dirac point is a prerequisite for unravelling various exotic physical phenomena which might be leveraged for potential technological device applications. Here we account effective single crystal growth of (BiSb)2-xDyxTe3 where x = 0, 0.0...

The hunt for a cleaner energy carrier leads us to consider a source that produces no toxic byproducts. One of the targeted alternatives in this approach is hydrogen energy, which, unfortunately, suffers from a lack of efficient storage media. Solid-state hydrogen absorption systems, such as lithium amide (LiNH2) systems, may store up to 6.5 weight...

Hydrogen as an energy carrier has shown promises for future energy infrastructure. Due to its light weight and explosive nature, hydrogen need to be stored in safe and efficient way. The storage in solid state materials has been proposed as the safest method, which can store hydrogen through chemical bonding. Among several studied materials so far,...

An extended-gate field-effect transistor (EGFET) is an important device which is studied as a pH sensor. The objective of this research is to characterize and study nanostructured bismuth oxide (Bi2O3) film for pH sensing applications. Bi2O3 film was developed in a two-step process through the electron-beam evaporation technique and subsequently by...

The current paper reports the electrochemical synthesis and characterization of novel multidimensional copper/cuprous oxide (Cu2O) and cupric oxide (CuO) nanoparticles (NPs) with varying shapes and morphologies using trisodium citrate (TSC) as an additive at pH 13.11. This electrochemical one-pot synthetic route is facile and sustainable in which a...

The influence of magnetic dopants on the transport properties of topological insulators is of great interest. In this work, studies on the impact of Fe− ion implantation on the physical and electronic properties of Sb2Te3 thin films have been done. The implantation was done with low-energy Fe− ions at three different fluences (1 × 1013, 1 × 1014, a...

All-solid-state Li-S batteries (use of solid electrolyte LiBH4) were prepared using cathodes of a homogeneous mixture of graphene oxide (GO) and reduced graphene oxide (rGO) with sulfur (S) and solid electrolyte lithium borohydride (LiBH4), and their electrochemical performance was reported. The use of LiBH4 and its compatibility with Li metal perm...

Implantation of defects is an attractive trend for the modification of important properties of thin films for practical applications. In the present attempt, an effective approach for tuning the native defects in thin films is reported. The films were sequentially irradiated at five different fluences (5 × 10¹¹, 1 × 10¹², 3 × 10¹², 5 × 10¹², and 1...

Recently, considerable interest has been initiated by the influence of magnetic dopants as well as the generation of internal strain on the transport properties of topological insulators. The controlled bulk charge carriers in topological insulators help in removing barriers for surface‐dominated transport. In this work, the impact of Fe‐ion implan...

In layered structure materials, tuning of strain is used to control critical electronic and physical properties. In this work, precise and controlled tuning of strain is achieved with implantation. Thin films of BiSbTe3 were implanted with Fe ion of energy 100 keV at 5 different fluences. The lattice strain is found to be reversibly tuned with Fe i...

In this paper, palladium thin films were deposited on the Si/SiO2/Pt substrate by using the electron beam evaporation technique, and then the films were annealed at 500 °C for one hour in an oxygen ambient to form the palladium oxide (PdO) film. The films have been tested for hydrogen ion(pH) sensing. The film was characterized by FESEM (Field-emis...

The time-reversal symmetry-protected surface states make topological insulators an interesting candidate for the fantastic quantum phenomenon. Nowadays, 3D Topological insulators doped with magnetic elements are becoming a promising area of research in fundamental device applications. The present work aims to investigate the influence of Cu dopants...

All‐solid‐state Li‐ion batteries are considered as next‐generation batteries, which provide safer operation by replacing the flammable liquid electrolyte by solid electrolyte. Developing these batteries using high capacity anode materials is warranted with the increasing demand of the energy sector. Among all the anode materials, alloying‐type anod...

Electrochemical energy storage is considered a remarkable way of bridging the gap between demand and supply due to intermittent renewable energy production. Recently developed metal hydride (M-H)-based negative electrodes have been proven the potential candidate for lithium-ion batteries including the merits of high theoretical capacity, relatively...

All-solid-state Li-ion batteries along with conversion reaction electrodes, represent a promising next generation technology for energy storage. Among the conversion reaction type materials, MgH2 is a leading contender owing to its high theoretical specific capacity (2036 mAhg⁻¹) and a suitable potential to be used as anode material. However, some...

For next-generation lithium-ion batteries (LIBs), it is essential to develop efficacious anode materials. Zinc oxide (ZnO) has been considered to be an effective material due to several interesting features such as high theoretical capacity, easy to synthesize, environmentally friendly, and low cost. Besides its many advantages, it suffers from two...

The electrochemical reaction mechanism of Bi2Te3 as negative electrode in all solid-state Li-ion battery (LIB) having LiBH4 as a solid electrolyte is established herein. To observe the effect of nanosized electrode material on the battery performance, Bi2Te3 nanorods were also used as anode material similar to the above battery setup. The galvanost...

In the present work, the simple and efficient wet chemical route is presented for the preparation of bismuth telluride nanostructures (nanoparticles, nanorods, and nanotubes). The temperature parameter was controlled to see the effect on the structure and morphology of the Bismuth Telluride. The structural, morphological, and oxide formation of Bis...

Bismuth chalcogenide (Bi2X3; X = sulfur (S), selenium (Se), and tellurium (Te)) materials are considered as promising materials for diverse applications due to their unique properties. Their narrow bandgap, good thermal conductivity, and environmental friendliness make them suitable candidates for thermoelectric applications, photodetector, sensors...

The electrochemical reaction mechanism of lithium (Li)-ion with Bi2Se3 anode material in all solid-state lithium-ion batteries (LIBs) has been successfully established in this work. Firstly, commercial bulk Bi2Se3 was directly used as anode in LIB and then hydrothermally synthesized Bi2Se3 nanostructures were used as anode material in order to impr...

Isovalent doping is a well-known method to induce internal stress without altering the electronic structure of materials. This study aims at understanding the effect of isovalent substitution of bismuth with antimony on the structural and electrical transport properties in Bismuth Antimony Telluride (BST) systems. Single crystals of BixSb2-xTe3 (0...

Bi2Te3, Sb2Te3, and their intermixtures are classical topological insulators with relatively simple electronic band structure. These materials are well known for their near room temperature thermoelectric effect too. The tuning of the Fermi level is considered relatively easy in these materials to achieve bulk insulating character. This study aims...

In the present paper, Na3BiO4–Bi2O3 films have been tested for hydrogen ion sensing. Na3BiO4–Bi2O3 mixed oxide nanostructures were deposited on the Indium–Tin-Oxide (ITO) coated glass substrate using a low-cost electrodeposition technique at room temperature. The nanostructures have been characterized using FESEM and XPS to study their morphology a...

Films of bismuth telluride (Bi2Te3) and its selenium (Se) derivatives (Bi2SeTe2, Bi2Se2Te, Bi2Se3) were deposited using electrodeposition on indium tin oxide coated glass substrate (ITO). The structural, morphological and optical properties of the prepared films were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), raman s...

This study presents a systematic observation of the ability of bismuth nanostructures to detect trace amounts of mercury. Nanostructured hexagons of bismuth were synthesized using electrochemical deposition with potentiostatic mode on indium tin oxide-coated glass electrodes. Regular hexagons composed of nano-sized hexagonal building blocks (edge l...

Bismuth telluride (\({\hbox {Bi}}_{2} {\hbox {Te}}_{3}\)) has myriad applications in the field of topological insulators and thermoelectrics. In the present work, \({\hbox {Bi}}_{2} {\hbox {Te}}_{3}\) nanostructures with two different morphologies were synthesized by wet chemical method. Prepared nanostructures were found to be polycrystalline with...

The present study highlights the first-ever application of fastest lithium (Li) ion conducting complex hydride containing cluster anions, namely lithium borohydride (LiBH4) into an all-solid-state Li-ion battery having Bi2Te3 as anode material. Bi2Te3 nanostructures were prepared by the simple wet chemical method and characterized by their crystal...

Bismuth nano hexagons were synthesized using potentiostatic electrodeposition and studied for their performance towards electrochemical hydrogen storage and evolution. Regular hexagons with edge length ≈ 500 nm and thickness ≈ 80 nm were observed in scanning electron microscopy (SEM). X-ray diffraction (XRD) pattern indicates the presence of poly-c...