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

Energy & Environmental Science, Год журнала: 2023, Номер 16(4), С. 1384 - 1430

Опубликована: Янв. 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.

Язык: Английский

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Electrocatalytic seawater splitting: Nice designs, advanced strategies, challenges and perspectives

Materials Today, Год журнала: 2023, Номер 69, С. 193 - 235

Опубликована: Сен. 19, 2023

Язык: Английский

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Bubble Engineering on Micro-/Nanostructured Electrodes for Water Splitting

ACS Nano, Год журнала: 2023, Номер 17(23), С. 23299 - 23316

Опубликована: Ноя. 21, 2023

Bubble behaviors play crucial roles in mass transfer and energy efficiency gas evolution reactions. Combining multiscale structures surface chemical compositions, micro-/nanostructured electrodes have drawn increasing attention. With the aim to identify exciting opportunities rationalize electrode designs, this review, we present our current comprehension of bubble engineering on electrodes, focusing water splitting. We first provide a brief introduction wettability electrodes. Then discuss advantages for (detailing lowered overpotential, promoted supply electrolyte, faster growth kinetics), localized electric field intensity, stability. Following that, outline strategies promoting detachment directional transportation. Finally, offer perspectives emerging future research directions.

Язык: Английский

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Rational Design of Hydrogen Evolution Reaction Electrocatalysts for Commercial Alkaline Water Electrolysis

Small Structures, Год журнала: 2023, Номер 4(8)

Опубликована: Март 22, 2023

With the further exploitation of renewable energy sources, electrochemical hydrogen evolution reaction (HER) is considered a key technology to solve environmental problems and achieve global carbon neutrality. Currently, alkaline water electrolyzers (AWEs) have been revitalized as traditional electrolytic production industry, yet they face great challenges in achieving new technological breakthroughs due catalytic properties electrode materials. In media, besides slow kinetics oxygen reaction, sluggish HER needing dissociation mass transfer at high current densities are among major factors limiting development electrolysis for industrial applications. Therefore, it importance design electrocatalysts with activity stability (>500 mA cm −2 ) applications “Research Development level” (R&D level). Herein, brief overview AWEs scale presented, some mainstream recognized catalysis mechanisms electrolytes summarized. Based on requirements application theoretical guidance, activation strategies also This review will propose insights into future electrolysis.

Язык: 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, Год журнала: 2023, Номер 33(50)

Опубликована: Авг. 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.

Язык: Английский

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Regulating Spin States in Oxygen Electrocatalysis

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(15)

Опубликована: Янв. 4, 2023

Abstract Developing efficient and stable transition metal oxides catalysts for energy conversion processes such as oxygen evolution reaction reduction is one of the key measures to solve problem shortage. The spin state strongly correlated with their catalytic activities. In an octahedral structure oxides, active centers could be regulated by adjusting splitting electron pairing energy. Regulating directly modulate d orbitals occupancy, which influence strength metal‐ligand bonds adsorption behavior intermediates. this review, we clarified significance regulating centers. Subsequently, discussed several characterization technologies some recent strategies regulate Finally, put forward views on future research direction vital field.

Язык: Английский

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Stable hydrogen evolution reaction at high current densities via designing the Ni single atoms and Ru nanoparticles linked by carbon bridges

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 12, 2024

Abstract Continuous and effective hydrogen evolution under high current densities remains a challenge for water electrolysis owing to the rapid performance degradation continuous large-current operation. In this study, theoretical calculations, operando Raman spectroscopy, CO stripping experiments confirm that Ru nanocrystals have resistance against deactivation because of synergistic adsorption OH intermediates (OH ad ) on single atoms. Based conceptual model, we design Ni atoms modifying ultra-small nanoparticle with defect carbon bridging structure (UP-RuNi SAs /C) via unique unipolar pulse electrodeposition (UPED) strategy. As result, UP-RuNi /C is found capable running steadily 100 h at 3 A cm −2 , shows low overpotential 9 mV density 10 mA alkaline conditions. Moreover, allows an anion exchange membrane (AEM) electrolyzer operate stably 1.95 V cell 250 1 .

Язык: Английский

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Dynamically Adaptive Bubbling for Upgrading Oxygen Evolution Reaction Using Lamellar Fern‐Like Alloy Aerogel Self‐Standing Electrodes

Advanced Materials, Год журнала: 2023, Номер 36(1)

Опубликована: Сен. 24, 2023

Adopting renewable electricity to produce "green" hydrogen has been a critical challenge because at high current density the mass transfer capability of most catalytic electrodes deteriorates significantly. Herein, unique lamellar fern-like alloy aerogel (LFA) electrode, showing dynamically adaptive bubbling and can effectively avoid stress concentration caused by bubble aggregation is reported. The LFA electrode intrinsically highly catalytic-active shows porous, resilient, hierarchically ordered, well-percolated conductive network. It not only superior gas evacuation but also exhibits significantly improved stability densities, record lowest oxygen evolution reaction (OER) overpotential 244 mV 1000 mA cm

Язык: Английский

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Seed-assisted formation of NiFe anode catalysts for anion exchange membrane water electrolysis at industrial-scale current density

Nature Catalysis, Год журнала: 2024, Номер 7(8), С. 944 - 952

Опубликована: Авг. 13, 2024

Язык: Английский

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Ferricyanide Armed Anodes Enable Stable Water Oxidation in Saturated Saline Water at 2 A/cm²

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(40)

Опубликована: Авг. 21, 2023

The direct seawater electrolysis at high current density and low overpotential affords an effective strategy toward clean renewable hydrogen fuel production. However, the severe corrosion of anode as a result saturation Cl- upon continuous feeding seriously hamper electrolytic process. Herein, cobalt ferricyanide / phosphide (CoFePBA/Co2 P) anodes with Cap/Pin structure are synthesized, which stably catalyze alkaline saturated saline water oxidation 200-2000 mA cm-2 over hundreds hours without corrosion. Together experimental findings, molecular dynamics simulations reveal that PO43- Fe(CN)63- generated by electrode play synergistic role in repelling via electrostatic repulsion dense coverage, reduced adsorption nearly 5-fold. novel anionic synergy endow superior protection for electrode, is expected to promote practical application electrolysis.

Язык: Английский

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