A5020694640- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Advanced battery technologies research
- Catalytic Processes in Materials Science
- CO2 Reduction Techniques and Catalysts
- Advancements in Battery Materials
- Catalysis and Hydrodesulfurization Studies
- Advanced Battery Materials and Technologies
- Semiconductor materials and devices
- Ionic liquids properties and applications
- Advanced Nanomaterials in Catalysis
- Graphene and Nanomaterials Applications
- Carbon Dioxide Capture Technologies
- Catalysis and Oxidation Reactions
- Carbon and Quantum Dots Applications
- Advanced Battery Technologies Research
- Carbon dioxide utilization in catalysis
- Extraction and Separation Processes
- Spectroscopy and Quantum Chemical Studies
- Advanced Photocatalysis Techniques
- Advanced Memory and Neural Computing
- Covalent Organic Framework Applications
- Chemical Looping and Thermochemical Processes
- MXene and MAX Phase Materials
East China University of Science and Technology
2021-2025
State Key Laboratory of Chemical Engineering
2023-2024
École Nationale Supérieure de Chimie de Montpellier
2019-2022
Université de Montpellier
2019-2022
Centre National de la Recherche Scientifique
2019-2022
Collaborative Innovation Center of Chemical Science and Engineering Tianjin
2020-2021
Institut Charles Gerhardt Montpellier
2018-2021
Tianjin University
2020-2021
Northeastern University
2015-2020
Universidad del Noreste
2015-2020
Nitrogen-doped carbon materials featuring atomically dispersed metal cations (M–N–C) are an emerging family of with potential applications for electrocatalysis. The electrocatalytic activity M–N–C toward four-electron oxygen reduction reaction (ORR) to H2O is a mainstream line research replacing platinum-group-metal-based catalysts at the cathode fuel cells. However, fundamental and practical aspects their two-electron ORR H2O2, future green "dream" process chemical industry, remain poorly...
The biomimetic dynamic nature of the Fe–N–C active site with a near-optimal Fe<sup>2+/3+</sup>redox potential facilitates ORR by balancing site-blocking effect and O<sub>2</sub>dissociation.
Single-atom catalysts with full utilization of metal centers can bridge the gap between molecular and solid-state catalysis. Metal-nitrogen-carbon materials prepared via pyrolysis are promising single-atom but often also comprise metallic particles. Here, we pyrolytically synthesize a Co-N-C material only comprising atomically dispersed cobalt ions identify X-ray absorption spectroscopy, magnetic susceptibility measurements density functional theory structure electronic state three...
Developing highly efficient, low-cost oxygen reduction catalysts, especially in acidic medium, is of significance toward fuel cell commercialization. Although pyrolyzed Fe-N-C catalysts have been regarded as alternatives to platinum-based catalytic materials, further improvement requires precise control the Fe-Nx structure at molecular level and a comprehensive understanding site ORR mechanism on these materials. In this report, we present microporous metal–organic-framework-confined...
Despite the fundamental and practical significance of hydrogen evolution oxidation reactions (HER/HOR), their kinetics in base remain unclear. Herein, we show that alkaline HER/HOR can be unified by catalytic roles adsorbed hydroxyl (OHad)-water-alkali metal cation (AM+) adducts, on basis observations enriching OHad abundance via surface Ni benefits HER/HOR; increasing AM+ concentration only promotes HER, while varying identity affects both HER/HOR. The presence OHad-(H2O)x-AM+ double-layer...
Abstract Cu‐based electrocatalysts facilitate CO 2 electrochemical reduction (CO ER) to produce multi‐carbon products. However, the roles of Cu 0 and + mechanistic understanding remain elusive. This paper describes controllable construction ‐Cu sites derived from well‐dispersed cupric oxide particles supported on copper phyllosilicate lamella enhance ER performance. 20 % Cu/CuSiO 3 shows superior performance with 51.8 C H 4 Faraday efficiency at −1.1 V vs reversible hydrogen electrode during...
Realization of the hydrogen economy relies on effective production, storage, and utilization. The slow kinetics evolution oxidation reaction (HER/HOR) in alkaline media limits many practical applications involving generation utilization, how to overcome this fundamental limitation remains debatable. Here we present a kinetic study HOR representative catalytic systems media. Electrochemical measurements show that rate Pt-Ru/C Ru/C is decoupled their binding energy (HBE), challenging current...
Pyrolysis is indispensable for synthesizing highly active Fe–N–C catalysts the oxygen reduction reaction (ORR) in acid, but how Fe, N, and C precursors transform to ORR-active sites during pyrolysis remains unclear. This knowledge gap obscures connections between input output products, clouding pathway toward catalyst improvement. Herein, we unravel evolution of comprised exclusively single-atom Fe1(II)–N4 via in-temperature X-ray absorption spectroscopy. The Fe precursor transforms oxides...
Significant progress toward the understanding of electrochemical process has been achieved in past decades, owning to advancements <italic>operando</italic> characterization techniques.
Doping with a transition metal was recently shown to greatly boost the activity and durability of PtNi/C octahedral nanoparticles (NPs) for oxygen reduction reaction (ORR), but its specific roles remain unclear. By combining electrochemistry, ex situ in spectroscopic techniques, density functional theory calculations, newly developed kinetic Monte Carlo model, we showed that Mo atoms are preferentially located on vertex edge sites Mo–PtNi/C form oxides, which stable within wide potential...
Iridium-based electrocatalysts are the most promising candidates for acidic oxygen evolution reaction (OER). Considering their high cost and scarcity, it is imperative to maximize atom utilization enhance intrinsic activity of iridium. In this work, IrOx sub-2 nm clusters stabilized on TiO2 supports via metal support interaction (MSI) induced by vacancy defects in TiO2. The strength MSI readily tuned type vacancies: vacancies (VO-TiO2) induce adsorbed with relatively weak strength, while...
Many industrial catalysts are composed of metal particles supported on oxides (MMO). It is known that the catalytic activity MMO materials governed by and oxide interactions (MMOI), but how to optimize systems via manipulation MMOI remains unclear, due primarily ambiguous nature MMOI. Herein, we develop a Pt/NbOx/C system with tunable structural electronic properties modified arc plasma deposition method. We unravel characterizing this under reactive conditions utilizing combined...
Proper understanding of the major limitations current catalysts for oxygen reduction reaction (ORR) is essential further advancement. Herein by studying representative Pt and non-Pt ORR with a wide range redox potential (Eredox) via combined electrochemical, theoretical, in situ spectroscopic methods, we demonstrate that role site-blocking effect limiting varies drastically depending on Eredox active sites; intrinsic activity sites low have been markedly underestimated owing to overlook this...
The H<sub>2</sub>O<sub>ad</sub>↓ and [AM(H<sub>2</sub>O)<sub>x</sub>]<sup>+</sup>promote the HOR HER of Pt by removing H<sub>ad</sub>and OH<sub>ad</sub>, respectively.
Metal macrocycles are among the most important catalytic systems in electrocatalysis and biocatalysis owing to their rich redox chemistry. Precise understanding of behavior metal operando is essential for fundamental studies practical applications this system. Here we present electrochemical data representative iron phthalocyanine (FePc) both aqueous nonaqueous media coupled with situ Raman X-ray absorption analyses challenge traditional notion transition FePc at low potential end by showing...
Abstract Fe‐N‐C catalysts containing atomic FeN x sites are promising candidates as precious‐metal‐free for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. The durability of cells has been extensively studied using accelerated stress tests (AST). Herein we reveal stronger degradation the structure and four‐times higher ORR activity loss when performing load cycling AST O 2 ‐ vs. Ar‐saturated pH 1 electrolyte. Raman spectroscopy results show carbon corrosion after ,...
Two Fe-N-C catalysts comprising only atomically-dispersed FeNx moieties were prepared, differing in the fact that second catalyst (Fe0.5-NH3) was obtained by subjecting first one (Fe0.5-Ar) to a short pyrolysis ammonia. While initial ORR activity acid medium rotating disk electrode is similar for both catalysts, alkaline significantly higher Fe0.5-NH3. Time-resolved Fe dissolution reveals circa 10 times enhanced leaching rate acidic electrolyte Fe0.5-NH3 relative Fe0.5-Ar. Furthermore,...
NADPH oxidase (NOX) as a transmembrane enzyme complex controls the generation of superoxide that plays important roles in immune signaling pathway. NOX inactivation may elicit immunodeficiency and cause chronic granulomatous disease (CGD). Biocompatible synthetic materials with NOX-like activities would therefore be interesting curative and/or preventive approaches case deficiency. Herein, we synthesized Fe–N doped graphene (FeNGR) nanomaterial could mimic activity by efficiently catalyzing...
Abstract The commercial success of the electrochemical energy conversion technologies required for decarbonization sector requires replacement noble metal‐based electrocatalysts currently used in (co‐)electrolyzers and fuel cells with inexpensive, platinum‐group metal‐free analogs. Among these, Fe/N/C‐type catalysts display promising performances reduction O 2 or CO , but their insufficient activity stability jeopardize implementation such devices. To circumvent these issues, a better...