A5083249913- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Electrocatalysts for Energy Conversion
- Supercapacitor Materials and Fabrication
- Fuel Cells and Related Materials
- Advanced Photocatalysis Techniques
- Gas Sensing Nanomaterials and Sensors
- Graphene research and applications
- Advanced battery technologies research
- Inorganic Chemistry and Materials
- Layered Double Hydroxides Synthesis and Applications
- Chemical Synthesis and Characterization
- Copper-based nanomaterials and applications
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Battery Technologies Research
- Carbon and Quantum Dots Applications
- Electronic and Structural Properties of Oxides
Humboldt-Universität zu Berlin
2020-2022
Indian Institute of Technology Madras
2022
Friedrich Schiller University Jena
2019-2020
King Abdullah University of Science and Technology
2017-2018
Ulsan National Institute of Science and Technology
2015-2016
National Chemical Laboratory
2010-2016
Here, a simple but efficient way is demonstrated for the preparation of nanoporous graphene enriched with Fe/Co–nitrogen‐doped active sites (Fe/Co‐NpGr) as potential electrocatalyst electrochemical oxygen reduction reaction (ORR) applications. Once converted into porous (pGr) by controlled oxidative etching process, pGr can be ORR utilizing created edge doping nitrogen and subsequently to utilize doped nitrogens build Fe/Co coordinated centers (Fe/Co‐NpGr). The structural information...
A simple way to produce an efficient metal-free oxygen reduction electrocatalyst from graphene by generating nanopores in the matrix and subsequently establishing nitrogen-doped active sites along pore openings is demonstrated. Well-structured nanoporous (pGr) photoluminescent quantum dots (GQDs) could be simultaneously generated a chemically assisted oxidative treatment of graphene. The process helped knock out small pieces Gr through epoxide formation, which resulted generation GQD pGr...
A simple way to simultaneously create pores and nitrogen doped active sites on graphene for the electrochemical oxygen reduction reaction (ORR) is developed. The key aspect of process in-situ generation Fe2O3 nanoparticles their concomitant dispersion by pyrolyzing oxide (GO) with iron phenanthroline complex. Thus deposited act as seeds pore etching carbon layer along graphene–Fe2O3 interface. Detection presence Fe3C confirms spill-over from a plausible step involved in engraving process....
Abstract The facile synthesis of a porous carbon material that is doped with iron‐coordinated nitrogen active sites (FeNC‐70) demonstrated by following an inexpensive synthetic pathway zeolitic imidazolate framework (ZIF‐70) as template. To emphasize the possibility tuning porosity and surface area resulting materials based on structure parent ZIF, two other ZIFs, is, ZIF‐68 ZIF‐69, are also synthesized. derived from ZIF‐70, FeNC‐70, exhibits highest BET 262 m 2 g −1 compared to ZIF‐69....
Abstract Here, a Sn–C composite material prepared from bulk precursors (tin metal, graphite, and melamine) using ball milling annealing is reported. The (58 wt% Sn 42 N‐doped carbon) shows capacity up to 445 mAh g Sn+C −1 an excellent cycle life (1000 cycles). For the leads graphene nanoplatelets (GnP) for which storage mechanism changes solvent co‐intercalation conventional intercalation. final (Sn at nitrogen‐doped graphite (SnNGnP)) obtained by combining GnPs with melamine as nitrogen...
Ever-increasing energy demands and the depletion of fossil fuels are compelling humanity toward development suitable electrochemical conversion storage devices to attain a more sustainable society with adequate renewable zero environmental pollution. In this regard, supercapacitors being contemplated as potential afford cleaner, environmentally friendly energy. Recently, great deal attention has been paid two-dimensional (2D) nanomaterials, including 2D graphene its inorganic analogues...
Abstract Here, a simple and efficient preparation of NiCoO 2 nanoparticle modified nanoporous bismuth vanadate (BiVO 4 ) thin film its application in photoelectrocatalytic (PEC) oxygen evolution reaction (OER) is demonstrated. The role the composite electrode /NiCoO twofold: OER cocatalyst band structure modifier. It improves surface kinetics for PEC enhances charge separation efficiency simultaneously, which believed to be determining factor unprecedentedly high performance this BiVO...
The ability of phosphonated carbon nanotubes to offer an unprecedented approach tune both proton conductivity and mechanical stability hybrid polymer electrolytes based on the polybenzimidazole membrane is demonstrated for fuel cell applications. covalent attachment between amino group 2-aminoethylphosphonic acid precursor CNTs has been confirmed by NMR IR experiments, while EDAX analysis indicates that one out every 20 atoms in CNT functionalized. Proton composite shows a remarkable 50%...
Abstract This work reports the facile synthesis of a Sn–P composite combined with nitrogen doped hard carbon (NHC) obtained by ball‐milling and its use as electrode material for sodium ion batteries (SIBs). The “Sn 4 P 3 ”/NHC (with nominal composition ”:NHC = 75:25 wt%) when coupled diglyme‐based electrolyte rather than most commonly employed carbonate‐based systems, exhibits reversible capacity 550 mAh g −1 at 50 mA 440 over 500 cycles (83% retention). Morphology solid interphase formation...
The effects of annealing treatment between 400 °C and 540 on crystallization behavior, grain size, electrochemical (EC) photoelectrochemical (PEC) oxygen evolution reaction (OER) performances bismuth vanadate (BiVO4) thin films are investigated in this work. results show that higher temperature leads to larger improved crystallinity, better crystal orientation for the BiVO4 film electrodes. Under air-mass 1.5 global (AM 1.5) solar light illumination, prepared at a (500-540 °C) shows PEC OER...
Abstract The limited Na‐storage capacity of graphite anodes for sodium‐ion batteries (∼110 mAh g −1 ) is significantly enhanced by the incorporation nanosized Sn (17 wt%). composite (SntGraphite), prepared simple annealing with SnCl 2 , shows a specific 223 (at 50 mA combined excellent cycle life (i. e., 96 % retention after 2,200 cycles at 1 A and initial Coulomb efficiency (90 %). storage sodium in (by solvent co‐intercalation) alloy formation) followed situ X‐ray diffraction...
We demonstrate a facile construction of iron nitride-doped carbon nanofiber by effectively utilizing the existing slit pores and rough edges along inner wall substrate as originated virtue its cup-stack structure for increasing number active sites consequently oxygen reduction activity.
We demonstrate how surface unsaturation developed during small order buckling of graphene interlayer upon doping iron nitride (i.e., FeNx) moieties in carbon nanofiber can be utilized as a very efficient mode activation to establish fine distribution Pt nanoparticles with 10 wt %. The dislocations have been effectively modulating the oxygen reduction characteristics through synergistic effects interacting species. simultaneous enhancement dispersion and reaction (ORR) activity low weight...
MoS2 nanosheets prepared by chemical exfoliation are studied as electrode materials for sodium solid-state batteries (Na-SSBs). Sodium thiophosphate (Na3PS4) is used the solid electrolyte and synthesized high-energy ball milling. The stability of Na3PS4 in contact with Na metal a Na–Sn alloy compared, latter showing more favorable properties. configuration Na-SSB Na–Sn|Na3PS4|(MoS2, Na3PS4, carbon) positive containing 60 wt % MoS2, 30 10 carbon. Assuming full conversion, theoretical capacity...
The use of composites instead pure metals as negative electrodes is an alternative strategy for making all-solid-state lithium-ion batteries (Li-SSBs) more viable. This study reports on the properties a composite electrode (Sn/Graphite) consisting nanosized Sn (17 wt %) and graphite (83 %). theoretical capacity this material 478 mAh g(Sn/Graphite)–1. When mixed with Li3PS4 (LPS) solid electrolyte (SE), areal 1.75 cm–2 (active mass loading 3.8 mg cm–2) obtained, which can be increased up to...
In article number 1700540, Peng Wang and co-workers report that bismuth vanadate (BiVO4), when assisted by nickel cobalt oxides (NiCoO2), shows vastly improved photo(electro)catalysis (PEC) oxygen evolution reaction (OER) performance. The role of NiCoO2 is two folds: OER cocatalyst band structure adjustment. dual-role on single-component improves surface kinetics for PEC enhances charge separation the BiVO4 simultaneously, which determining factor unprecedented