Theoretical investigation of HER/OER/ORR catalytic activity of single atom-decorated graphyne by DFT and comparative DOS analyses

Applied Surface Science, Journal Year: 2022, Volume and Issue: 592, P. 153237 - 153237

Published: March 29, 2022

Language: Английский

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Anode Catalysts in Anion‐Exchange‐Membrane Electrolysis without Supporting Electrolyte: Conductivity, Dynamics, and Ionomer Degradation

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(35)

Published: July 5, 2022

Anion-exchange-membrane water electrolyzers (AEMWEs) in principle operate without soluble electrolyte using earth-abundant catalysts and cell materials thus lower the cost of green H2 . Current systems lack competitive performance durability needed for commercialization. One critical issue is a poor understanding catalyst-specific degradation processes electrolyzer. While non-platinum-group-metal (non-PGM) oxygen-evolution show excellent strongly alkaline electrolyte, this has not transferred directly to pure-water AEMWEs. Here, AEMWEs with five non-PGM anode are built catalysts' structural stability interactions ionomer characterized during electrolyzer operation post-mortem. The results catalyst electrical conductivity one key obtaining high-performing that many restructure operation. Dynamic Fe sites correlate enhanced rates, as does addition impurities. In contrast, electronically conductive Co3 O4 nanoparticles (without crystal structure) yield from simple, standard preparation methods, comparable IrO2 These reveal fundamental dynamic catalytic resulting AEMWE device failure under relevant conditions, demonstrate viable operation, illustrate underlying design rules engineering catalyst/ionomer layers higher durability.

Language: Английский

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Atomic‐Level Surface Engineering of Nickel Phosphide Nanoarrays for Efficient Electrocatalytic Water Splitting at Large Current Density

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(4)

Published: Nov. 30, 2022

Abstract Designing high‐performance and cost‐effective electrocatalysts for water splitting at high current density is pivotal practical industrial applications. Herein, it found that atomic‐level surface engineering of self‐supported nickel phosphide (NiP) nanoarrays via a facile cation‐exchange method can substantially regulate the chemical physical properties catalysts by introducing Co atoms. Such surface‐engineered Ni x 1–x P endows several aspects merits: i) rough nanosheet array electrode structure accessible to diffusion electrolytes release gas bubbles, ii) enriched vacancies companied doping thus increased active sites, iii) synergy 5 4 NiP 2 beneficial catalytic activity enhancement. By virtue finely controlling contents, optimal 0.96 0.04 achieves remarkable bifunctional electrocatalytic performance overall large 1000 mA cm −2 , showing overpotentials 249.7 mV hydrogen evolution reaction 281.7 oxygen reaction. Furthermore, 500 exhibits an ultralow potential (1.71 V) ultralong durability (500 h) splitting. This study implies materials offers viable route gaining density.

Language: Английский

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Modulation of the interfacial charge density on Fe2P–CoP by coupling CeO2 for accelerating alkaline electrocatalytic hydrogen evolution reaction and overall water splitting

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 451, P. 138550 - 138550

Published: Aug. 9, 2022

Language: Английский

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Anion exchange membrane water electrolysis for sustainable large‐scale hydrogen production

Carbon Neutralization, Journal Year: 2022, Volume and Issue: 1(1), P. 26 - 48

Published: June 1, 2022

Abstract The development of sustainable energy technology has received considerable attention to meet the increasing demands and realize carbon neutrality. Hydrogen is a promising alternative source replace fossil fuels mitigate environmental issues. However, most hydrogen produced by reforming fuels, called gray hydrogen, production emits large amount dioxide. As approach, water electrolysis been developed produce high‐purity green hydrogen. Among various technologies, equipped with an anion exchange membrane regarded as attractive pathway for large‐scale H 2 at low cost. status electrolyzers approaching toward megawatt‐scale companies, which potential become competitive existing (alkaline electrolyzer, proton electrolyser). This review article represents recent advances in major components (membrane, catalyst, electrode assembly) electrolyzers. By recognizing current performance solving remaining challenges, can be leading production.

Language: Английский

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Cost‐Effective High Entropy Core–Shell Fiber for Stable Oxygen Evolution Reaction at 2 A cm⁻²

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(50)

Published: Aug. 1, 2023

Abstract Exploring highly efficient oxygen evolution reaction (OER) electrocatalysts is important for industrial water electrolysis, especially under high current densities (>1 A cm −2 ). High‐entropy alloy (HEA) with surface OER activity and excellent electrical conductivity of the core an ideal route to improve catalytic activity. Herein, a combined theoretical experimental approach establish core–shell FeCoNiMoAl‐based HEA as promising electrocatalyst presented. Theoretical calculations structure analyses indicate crystalline–amorphous ( c–a ) heterostructure shell reduces electron transfer resistance generates more active sites, furthermore crystalline improves self‐supporting ability. electrodes demonstrate superior performance overpotential η 470 mV at 2 no apparent degradation even after 330 h continuous testing, notably, overall splitting stability than 120 2.06 V. The special achieves win–win strategy stability. These findings shed light on structural design present achieve electrolysis relevant energy conversion processes.

Language: Английский

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Local hydroxyl enhancement design of NiFe sulfide electrocatalyst toward efficient oxygen evolution reaction

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 331, P. 122715 - 122715

Published: April 1, 2023

Language: Английский

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Dense Crystalline/Amorphous Phosphides/Oxides Interfacial Sites for Enhanced Industrial-Level Large Current Density Seawater Oxidation

ACS Nano, Journal Year: 2023, Volume and Issue: 17(16), P. 16008 - 16019

Published: June 29, 2023

Designing high-efficiency and low-cost catalysts with high current densities for the oxygen evolution reaction (OER) is critical commercial seawater electrolysis. Here, we present a heterophase synthetic strategy constructing an electrocatalyst dense heterogeneous interfacial sites among crystalline Ni2P, Fe2P, CeO2, amorphous NiFeCe oxides on nickel foam (NF). The synergistic effect of high-density interfaces effectively promotes redistribution charge density optimizes adsorbed intermediates, lowering energy barrier promoting O2 desorption, thus enhancing OER performance. obtained NiFeO-CeO2/NF catalyst exhibited outstanding catalytic activity, low overpotentials 338 408 mV required to attain 500 1000 mA cm-2, respectively, in alkaline natural electrolytes. solar-driven electrolysis system presents record-setting stable solar-to-hydrogen conversion efficiency 20.10%. This work provides directives developing highly effective large-scale clean production.

Language: Английский

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Disordered materials for high-performance lithium-ion batteries: A review

Nano Energy, Journal Year: 2024, Volume and Issue: 121, P. 109250 - 109250

Published: Jan. 3, 2024

Disordered materials (DMs) have become promising in the advancement of lithium-ion batteries (LIBs). Their disordered, open structure is conductive to facilitate efficiency storage. DMs with tunable compositions also possess abundant defects that can interact Li+, further enhancing their electrochemical performances LIBs. Yet, revealing structural origin superior properties DM-based LIBs remains a challenge. In this article, we review recent advances development components for LIBs, such as anodes, cathodes, coating layers, and solid-state electrolytes. We describe primary preparation characterization methods utilized DMs, while describing mechanisms involved DM synthesis. This article addresses correlation between performances. Moreover, elucidate challenges future perspectives summarize key advantages LIB performance over crystalline counterparts, providing insights developing through tailored development.

Language: Английский

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Electrostatically robust CoFeOF nanosheet against chloride for green-H2 production in alkaline seawater electrolysis

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 480, P. 146545 - 146545

Published: Oct. 9, 2023

Language: Английский

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