Two‐Dimensional Porous Molybdenum Phosphide/Nitride Heterojunction Nanosheets for pH‐Universal Hydrogen Evolution Reaction

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 60(12), P. 6673 - 6681

Published: Dec. 18, 2020

Abstract Herein, we present a new strategy for the synthesis of 2D porous MoP/Mo 2 N heterojunction nanosheets based on pyrolysis [PMo 12 O 40 ] 3− ‐melamine (PMo ‐MA) nanosheet precursor from polyethylene glycol (PEG)‐mediated assembly route. The heterostructure are ca. 20 nm thick and have plentiful pores (<5 nm). These structure features offer advantages to promote HER activity, including favorable water dissociation kinetics around as confirmed by theoretical calculations, large accessible surface nanosheets, enhanced mass‐transport ability pores. Consequently, exhibit excellent activity with low overpotentials 89, 91 89 mV achieve current density 10 mA cm −2 in alkaline, neutral acidic electrolytes, respectively. performance is superior commercial Pt/C at >55 medium >190 alkaline medium.

Language: Английский

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Surface Reconstruction of Water Splitting Electrocatalysts

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(33)

Published: July 8, 2022

Abstract Water electrolysis is regarded as an efficient and green method to produce hydrogen gas, a clean energy carrier that holds the key solving global problems. So far, efficiency large‐scale application of water are restricted by electrocatalytic activity applied catalysts. Recently, reconstruction phenomenon electrocatalysts during catalytic reaction has been discovered, which could form reactive sites for both oxygen evolution reactions. Regulation process generate large number species with high since demonstrated effective strategy enhance performance electrocatalysts. This review summarizes recent progress in regulation strategies First, mechanism briefly introduced, critical factors regarding systematically discussed, followed brief introduction advanced characterization reconstruction. Moreover, modulation summarized reported examples highlighting promoted effects on process. Finally, challenges facing surface‐reconstructed catalysts future discussed.

Language: Английский

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Transition metal-based catalysts for electrochemical water splitting at high current density: current status and perspectives

Nanoscale, Journal Year: 2021, Volume and Issue: 13(30), P. 12788 - 12817

Published: Jan. 1, 2021

Current popular transition metal-based electrocatalysts developed for HER/OER in water splitting at high current density are critically reviewed and discussed.

Language: Английский

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Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co₃O₄ and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

ACS Catalysis, Journal Year: 2021, Volume and Issue: 11(23), P. 14338 - 14351

Published: Nov. 12, 2021

The development of high-performance electrocatalysts is a highly efficient strategy to optimize the sluggish kinetic property oxygen evolution reaction (OER). Herein, we synthesize kind nickel foam (NF)-supported electrocatalyst composed one-dimensional Co3O4 nanowire as core and two-dimensional NiFe-LDH nanosheet shell (denoted NiFe-60/Co3O4@NF). Fluorine introduced into precursor Co(OH)F Co3O4, which results in improved thermal stability significantly increased regularly distributed vacancies, while electrochemically deposited nanosheets possess crystalline/amorphous hybrid structure. As result, hetero-interface mainly constituting Ni species from contributes interaction between Co Fe facilitates electron transfer. Simultaneously, vacancies coordinatively unsaturated amorphous area also determined, finally completing backtracking. Benefiting these factors, only low overpotentials 221 257 mV are required deliver current densities 100 500 mA cm–2, respectively, with quite small Tafel slope 34.6 dec–1 during OER for well-designed NiFe-60/Co3O4@NF electrocatalyst.

Language: Английский

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High‐Entropy Alloys for Electrocatalysis: Design, Characterization, and Applications

Small, Journal Year: 2021, Volume and Issue: 18(7)

Published: Nov. 5, 2021

Abstract High‐entropy alloys (HEAs) are expected to function well as electrocatalytic materials, owing their widely adjustable composition and unique physical chemical properties. Recently, HEA catalysts extensively studied in the field of electrocatalysis; this motivated authors investigate relationship between structure HEAs performance. In review, latest advances electrocatalysts systematically summarized, with special focus on nitrogen fixation, carbon cycle, water splitting, fuel cells; addition, by combining characterization analysis microstructures, rational design strategies for optimizing electrocatalysts, including controllable preparation, component regulation, strain engineering, defect theoretical prediction proposed. Moreover, existing issues future trends predicted, which will help further develop these high‐entropy materials.

Language: Английский

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A pyrolysis-free Ni/Fe bimetallic electrocatalyst for overall water splitting

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: March 31, 2023

Catalysts capable of electrochemical overall water splitting in acidic, neutral, and alkaline solution are important materials. This work develops bifunctional catalysts with single atom active sites through a pyrolysis-free route. Starting conjugated framework containing Fe sites, the addition Ni atoms is used to weaken adsorption electrochemically generated intermediates, thus leading more optimized energy level sand enhanced catalytic performance. The synthesis also ensured formation well-defined within structure, providing ideal platforms understand processes. as-prepared catalyst exhibits efficient capability for both acidic electrolytes. At current density 10 mA cm-2, overpotential hydrogen evolution oxygen 23/201 mV 42/194 0.5 M H2SO4 1 KOH, respectively. Our not only route towards applicable across wide range pH values, it provides successful showcase model in-depth mechanistic insight into splitting.

Language: Английский

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Key components and design strategy of the membrane electrode assembly for alkaline water electrolysis

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(4), P. 1384 - 1430

Published: Jan. 1, 2023

This review presents the state-of-the-art MEAs, including key components and preparation technologies. Especially, overall design strategies of MEAs are discussed to promote high-performance alkaline water electrolysis.

Language: Английский

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Single-Atom Engineering to Ignite 2D Transition Metal Dichalcogenide Based Catalysis: Fundamentals, Progress, and Beyond

Chemical Reviews, Journal Year: 2021, Volume and Issue: 122(1), P. 1273 - 1348

Published: Nov. 17, 2021

Single-atom catalysis has been recognized as a pivotal milestone in the development history of heterogeneous by virtue its superior catalytic performance, ultrahigh atomic utilization, and well-defined structure. Beyond single-atom protrusions, two more motifs substitutions vacancies along with synergistic motif assemblies have progressively developed to enrich family. On other hand, besides traditional carbon material based substrates, wide variety 2D transitional metal dichalcogenides (TMDs) emerging promising platform for owing their diverse elemental compositions, variable crystal structures, flexible electronic intrinsic activities toward many reactions. Such substantial expansion both substrates provides an enriched toolbox further optimize geometric structures pushing performance limit. Concomitantly, higher requirements put forward synthetic characterization techniques related technical bottlenecks being continuously conquered. Furthermore, this burgeoning catalyst (SAC) system triggered serial scientific issues about changeable single atom-2D substrate interaction, ambiguous effects various assemblies, well dynamic structure-performance correlations, all which necessitate clarification comprehensive summary. In context, Review aims summarize critically discuss engineering whole field TMD covering evolution history, methodologies, techniques, applications, correlations. situ are highlighted regarding critical roles real-time detection SAC reconstruction reaction pathway evolution, thus shedding light on lifetime correlations lay solid theoretical foundation field, especially SACs.

Language: Английский

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Boosting efficient alkaline fresh water and seawater electrolysis via electrochemical reconstruction

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(9), P. 3945 - 3957

Published: Jan. 1, 2022

A novel electrochemical reconstruction strategy enables the best seawater electrolysis performance.

Language: Английский

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Atomically Dispersed Reactive Centers for Electrocatalytic CO₂ Reduction and Water Splitting

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 60(24), P. 13177 - 13196

Published: Dec. 14, 2020

Developing electrocatalytic energy conversion technologies for replacing the traditional source is highly expected to resolve fossil fuel exhaustion and related environmental problems. Exploring stable high-efficiency electrocatalysts of vital importance promotion these technologies. Single-atom catalysts (SACs), with atomically distributed active sites on supports, perform as emerging materials in catalysis present promising prospects a wide range applications. The rationally designed near-range coordination environment, long-range electronic interaction microenvironment sphere cast huge influence reaction mechanism catalytic performance SACs. In current Review, some recent developments dispersed reactive centers CO2 reduction water splitting are well summarized. underlying structure-activity relationship elaborated based progresses various operando investigations. Finally, by highlighting challenges development single-atom catalysis, we hope shed light future research SACs conversion.

Language: Английский

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