A5047020055- Electrocatalysts for Energy Conversion
- Electrochemical Analysis and Applications
- Advanced battery technologies research
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Catalytic Processes in Materials Science
- Matrix Theory and Algorithms
- X-ray Diffraction in Crystallography
- Metal-Organic Frameworks: Synthesis and Applications
- Magnetic and transport properties of perovskites and related materials
- Dielectric properties of ceramics
- Advanced Photocatalysis Techniques
- Advanced Optimization Algorithms Research
- Copper-based nanomaterials and applications
- Crystallization and Solubility Studies
- Advanced Condensed Matter Physics
- Magnetic Properties and Synthesis of Ferrites
- Advanced Battery Materials and Technologies
- TiO2 Photocatalysis and Solar Cells
- Microfluidic and Capillary Electrophoresis Applications
- 2D Materials and Applications
- Advancements in Battery Materials
- Advanced oxidation water treatment
- Organic Electronics and Photovoltaics
- Ga2O3 and related materials
Korea Institute of Science and Technology
2021-2025
Korea Advanced Institute of Science and Technology
2022-2025
Indian Institute of Technology Madras
2017-2024
Indian Association for the Cultivation of Science
1976-2010
University of Calcutta
2008
The two-electrons (2e–) oxygen reduction reaction (ORR) offers a sustainable and decentralized alternative to the traditional synthetics for hydrogen peroxide (H2O2) production. Although various Co single atom catalysts (SACs) have been proposed as highly effective 2e– ORR catalysts, there is still room improvement through fine-tuned coordination environment. Here, Co-N5-O-C with combination of coordinated Co-N5 moieties nearby electro-withdrawing epoxides first time developed reach optimal...
Dinickel phosphide (Ni2P), an efficient electrocatalyst derived from commonly available elements, shows a noteworthy performance in the hydrogen evolution reaction (HER). This research includes extensive analysis using diverse characterization techniques, including scanning electron microscopy, transmission energy dispersive spectrometry, X-ray diffraction, absorption spectroscopy (XAS), paramagnetic resonance (EPR), and situ Raman spectroscopy, revealing structural change of Ni2P particles...
Water splitting for hydrogen production is a promising method storing sustainable energy sources. The oxygen-evolution reaction (OER) through water-oxidation reactions provides electrons and limitation water splitting. Thus, finding an efficient stable OER catalyst critical Herein, NiFe foam, after harsh anodization at 60 V in two-electrode system, reported as electrocatalyst. oxide formed on the foam's surface was characterized by some methods. These methods show presence of different...
Water splitting for large-scale hydrogen production is a method storing sustainable but intermittent energy sources. Oxygen evolution reaction (OER) through the water oxidation provides low-cost electrons formation of hydrogen. OER complicated, sluggish and bottleneck splitting. Herein, first, tetranuclear Ni complex with di(2-pyridyl) ketone (compound 1) has been synthesized. In next step, OERs in presence compound 1 at pHs 3.0 7.0 have investigated. The study attempts to answer following...
Tungsten disulfide (WS2), a promising electrocatalyst made from readily available materials, demonstrates significant effectiveness in the hydrogen-evolution reaction (HER). The study conducts thorough investigation using various analytical methods such as scanning electron microscopy (SEM), transmission (TEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), absorption spectroscopy (XAS), paramagnetic resonance (EPR), and situ Raman spectroscopy. These techniques have...
This study focuses on the oxygen-evolution reaction (OER) activity comparison between two forms of NiFe (hydr)oxides: compound 1, where Fe ions are applied surface nickel (hydr)oxide, and 2, with incorporated into structural matrix (hydr)oxide. The observed exponential link Coulombic energy total charge system points to a direct proportionality potential concentration oxidized (e.g., V ∝ [oxidized Ni]), diverging from logarithmic relationship outlined in Nernst equation or its modifications,...
The potential of the oxygen-evolution reaction (OER) to serve as a vital source electrons for reducing water, carbon dioxide, and ammonia is an area intense research. Among numerous catalysts investigated OER, Ir compounds have emerged particularly promising candidates. A notable highlight this study concurrent OER activity both Fe. Remarkably, independently exhibits high activity, even at exceedingly low overpotentials, establishing its distinctiveness among other metal oxides. Under...
NiFe oxide-based electrodes are promising compounds for oxygen-evolution reaction (OER), which is essential in metal–air batteries and water splitting. Indeed, OER of great significance the energy storage domain. Herein, have been applied as effective durable electrocatalysts presence NaHCO3 (baking soda). Compared to corrosive acidic or alkaline solutions, electrolysis baking soda solution toward producing oxygen hydrogen highly promising. Surprisingly, foam, without any anodization...
The electrochemical fixation of carbon dioxide (CO2) into organic halides is one the most prominent strategies for mitigating atmospheric CO2 emission, along with difficulties associated toxic and carcinogenic halogenated compounds. Cu-based nanomaterials have been explored numerous applications in nanotechnology, including electrocatalysis, catalytic transformations, photocatalysis. In this work, we designed developed a Cu-embedded carbazole-derived porous polymer (Cu@Cz-POP) nanohybrid by...
Understanding lithium-ion dynamics across defect-rich grain boundaries (GBs) is crucial for solid-state electrolytes. This study examines local electronic and structural changes in a Li1.3Al0.3Ti1.7(PO4)3 (LATP) solid electrolyte via X-ray absorption spectroscopy (XAS) their correlation with ion transport properties. GBs were tailored through conventional isothermal sintering (CIS) spark plasma (SPS). Ti L2,3-, K-, O P L2,3-edges from XAS revealed octahedral symmetry bulk regions of both...
Metal-organic frameworks (MOFs) are extensively investigated as catalysts in the oxygen-evolution reaction (OER). A Ni-Fe MOF with 2,5-dihydroxy terephthalate a linker has been claimed to be among most efficient for (OER) under alkaline conditions. Herein, stability OER was reinvestigated by electrochemical methods, X-ray diffraction, absorption spectroscopy, energy-dispersive scanning electron microscopy (SEM), transmission microscopy, nuclear magnetic resonance, operando visible...
Large-scale solar-driven water splitting is a way to store energy, but it requires the development of practical and durable oxygen evolution reaction (OER) catalysts. The present paper aims investigate mechanism OER, local pH, high-valent metal ions, limitations, conversions, details during OER in presence FeNi foam using situ surface-enhanced Raman spectroscopy. This research also explores use spectroscopy for detecting species on surfaces OER. acidic media around electrode not only limit...
An efficient and durable oxygen evolution reaction (OER) catalyst is necessary for the water-splitting process toward energy conversion. The OER through water oxidation reactions could provide electrons H2O, CO2, N2 reduction produce valuable compounds. Herein, FeNi (1:1 Ni/Fe) alloy as foam, after anodizing at 50 V in a two-electrode system KOH solution (1.0 M), was characterized by Raman spectroscopy, diffuse reflectance spectroscopy (DRS), X-ray absorption (XAS), diffraction (XRD),...
A new approach is used to synthesize various metal ions [Mg(II), Ca(II), Ba(II), Al(III), Zn(II), Cd(II), Mn(II), Fe(III), Co(III), Ni(II), and Cu(II)] between layers of Mn oxide in a pre-synthesized framework layered Mn–K oxide. These oxides were heated at 60–600 °C, their electrochemistry water oxidation reaction (WOR) investigated pH = 1. Using this strategy, the structure catalysts same, all are synthesized containing K(I) framework. Thus, comparing different same easier. After...
Temperature-dependent Raman spectral studies of BiFeO3 (BFO) films coated on three different substrates, viz., conducting Si (BFO-Si), sapphire (BFO-SAP), and fluorine-doped tin oxide (BFO-FTO), are reported between 123 773 K. The activity Bi–O Fe–O modes in these samples as a function temperature shows features despite having synthesized from the same precursor. To understand source variations, spectra obtained above were compared with those bulk (BFO-bulk) prepared via spark-plasma...
Abstract This study investigated the dynamic changes in NiFe (hydr)oxide and identified role of high‐valent Fe oxygen‐evolution reaction (OER) within alkaline media via situ techniques. Several ions were found to remain considerably stable absence potential (hydr)oxide, even 96 hours after OER. For Ni 2+ hydroxide treated with 57 ions, where sites are introduced onto surface hydroxide, no 4+ species detected at rate‐determining step (RDS). The findings this suggested that oxidation bulk...
Designing solid-state perovskite oxide solar cells with large short circuit current (JSC) and open voltage (VOC) has been a challenging problem. Epitaxial BiFeO3 (BFO) films are known to exhibit VOC (>50 V). However, they low JSC (≪μA/cm2) under 1 Sun illumination. In this work, taking polycrystalline thin films, we demonstrate that oxygen vacancies (VO) present within the lattice at grain boundary (GB) can explicitly be controlled achieve high simultaneously. While aliovalent substitution...
Sustainable energy sources require a large-scale storage system. Water electrolysis toward hydrogen formation is remarkable method for storage. However, oxygen-evolution reaction (OER) through water-oxidation bottleneck in water-splitting systems. Different Ni-based molecular structures have been claimed to be OER catalysts. the impact of Ni (hydr)oxides formed by degradation on challenging issue. The effect electrolyte impurity presence metal coordination compounds rarely investigated. In...
Large-scale solar-driven water splitting requires developing practical and durable oxygen-evolution reaction (OER) catalysts. Herein, a NiFe (hydr)oxide-based electrode that undergoes operation at 50 V is introduced as an effective electrocatalyst under neutral conditions. The produced on the surface of foam examined through several methods. All mentioned methods indicate presence various (hydr)oxides with different phases surface. For anodized pH 7, overpotential for onset OER activity 1...
Recently, copper(II) complexes have been extensively investigated as oxygen-evolution reaction (OER) catalysts through a water-oxidation reaction. Herein, new findings regarding OER in the presence of Cu(II) complex with 6,6'-dihydroxy-2,2'-bipyridine ligand are reported. Using scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, Raman spectroscopy, situ visible spectroelectrochemistry, absorption and electrochemistry, it is hypothesized that film formed on...
The oxygen-evolution reaction (OER), which involves water oxidation, is a complex four-electron with high activation barrier. In this study, an iron-doped oxidized cobalt–nickel alloy reported as efficient and stable OER electrocatalyst. anodized electrode underwent various characterizations, including surface-enhanced Raman spectroscopy (SERS). situ SERS was utilized to investigate the mechanism of detect high-valence metal oxides during OER, where Ni(III) Co(IV) species were observed....
The hydrogen evolution reaction (HER) plays a crucial role in various renewable energy technologies, and its efficiency is contingent upon the utilization of effective catalysts. Cobalt disulfide (CoS2), like platinum, utilized as an HER electrocatalyst. Nevertheless, CoS2 has advantage being sourced from elements that are abundantly available on Earth, compared to for HER. In this study, stability commercially accessible nanostructured powder investigated. To achieve aim, analytical...