Grain‐Boundary‐Rich RuO₂ Porous Nanosheet for Efficient and Stable Acidic Water Oxidation

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(28)

Published: April 25, 2024

Abstract RuO 2 has been considered as the most likely acidic oxygen evolution reaction (OER) catalyst to replace IrO , but its performance, especially long‐term stability under harsh conditions, is still unacceptable. Here, we propose a grain boundary (GB) engineering strategy by fabricating ultrathin porous nanosheet with abundant of boundaries (GB‐RuO ) an efficient acid OER catalyst. The involvement GB induces significant tensile stress and creates unsaturated coordination environment, effectively optimizing adsorption intermediates stabilizing active site structure during process. Notably, GB‐RuO not only exhibits low overpotential (η 10 =187 mV) ultra‐low Tafel slope (34.5 mV dec −1 ), also steadily operates for over 550 h in 0.1 M HClO 4 . Quasi situ/operando methods confirm that improved attributed preventing Ru dissolution greatly inhibiting lattice oxidation mechanism (LOM). A proton exchange membrane water electrolysis (PEMWE) using voltage 1.669 V at cm −2 stably 100 mA

Language: Английский

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Pinning effect of lattice Pb suppressing lattice oxygen reactivity of Pb-RuO2 enables stable industrial-level electrolysis

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Nov. 12, 2024

Ruthenium (Ru) is widely recognized as a low-cost alternative to iridium anode electrocatalyst in proton-exchange membrane water electrolyzers (PEMWE). However, the reported Ru-based catalysts usually only operate within tens of hours PEMWE because their intrinsically high reactivity lattice oxygen that leads irrepressible Ru leaching and structural collapse. Herein, we report design concept by employing large-sized acid-resistant lead (Pb) second element induce pinning effect for effectively narrowing moving channels atoms, thereby lowering oxides. The Pb-RuO

Language: Английский

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Atomically engineered interfaces inducing bridging oxygen-mediated deprotonation for enhanced oxygen evolution in acidic conditions

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Nov. 28, 2024

The development of efficient and stable electrocatalysts for water oxidation in acidic media is vital the commercialization proton exchange membrane electrolyzers. In this work, we successfully construct Ru–O–Ir atomic interfaces oxygen evolution reaction (OER). catalysts achieve overpotentials as low 167, 300, 390 mV at 10, 500, 1500 mA cm−2 0.5 M H2SO4, respectively, with electrocatalyst showing robust stability >1000 h operation 10 negligible degradation after 200,000 cyclic voltammetry cycles. Operando spectroelectrochemical measurements together theoretical investigations reveal that OER pathway over active site near-optimal, where bridging Ir–OBRI serves acceptor to accelerate transfer on an adjacent Ru centre, breaking typical adsorption-dissociation linear scaling relationship a single thus enhancing activity. Here, show rational design multiple sites can break activity/stability trade-off commonly encountered catalysts, offering good approaches towards high-performance catalysts. Efficient are essential authors report enable oxygen-mediated deprotonation pathways, overcoming evolution.

Language: Английский

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Breaking the Bottleneck of Activity and Stability of RuO₂-Based Electrocatalysts for Acidic Oxygen Evolution

Nano Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 13, 2024

Electrochemical acidic oxygen evolution reaction (OER) is an important part for water electrolysis utilizing a proton exchange membrane (PEM) apparatus industrial H

Language: Английский

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Boosting the durability of RuO2 via confinement effect for proton exchange membrane water electrolyzer

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 2, 2025

Language: Английский

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Dual Doping in Precious Metal Oxides: Accelerating Acidic Oxygen Evolution Reaction

International Journal of Molecular Sciences, Journal Year: 2025, Volume and Issue: 26(4), P. 1582 - 1582

Published: Feb. 13, 2025

Developing a highly active and stable catalyst for acidic oxygen evolution reactions (OERs), the key half-reaction proton exchange membrane water electrolysis, has been one of most cutting-edge topics in electrocatalysis. A dual-doping strategy optimizes electronic environment, modifies coordination generates vacancies, introduces strain effects through synergistic effect two elements to achieve high catalytic performance. In this review, we summarize progress dual doping RuO2 or IrO2 OERs. The three main mechanisms OERs are dicussed firstly, followed by detailed examination development history catalysts, from experimentally driven systems machine learning (ML) theoretical screening systems. Lastly, provide summary remaining challenges future prospects, offering valuable insights into

Language: Английский

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Electrochemical epoxidation enhanced by C2H4 activation and hydroxyl generation at the Ag/SnO2 interface

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Feb. 23, 2025

Language: Английский

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Inhibiting Overoxidation of Dynamically Evolved RuO₂ to Achieve a Win–Win in Activity–Stability for Acidic Water Electrolysis

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

Proton exchange membrane (PEM) water electrolysis offers an efficient route to large-scale green hydrogen production, in which the RuO2 catalyst exhibits superior activity but limited stability. Unveiling atomic-scale structural evolution during operando reaction conditions is critical remains a grand challenge for enhancing durability of acidic oxygen (a-OER). This study proposes adaptive machine learning workflow elucidate potential-dependent state-to-state global RuO2(110) surface within complex composition and configuration space, revealing correlation between patterns We identify active state with distorted RuO5 units that self-evolve at low potential, minor Ru dissolution self-promotion phenomenon. However, this potential resistance capacity (PRC) evolves into inert RuO4 elevated potential. To enhance PRC mitigate overevolution state, we explore metal doping engineering uncover inverse volcano-type rule: doped metal-oxygen bond strength should significantly differ from Ru-O bond. rule provides theoretical framework designing stable RuO2-based catalysts clarifies current discrepancies regarding roles different metals stabilizing RuO2. Applying rule, predict confirm experimentally Na can effectively stabilize its state. The synthesized Na-RuO2 operates a-OER over 1800 h without any degradation enables long-term PEM electrolysis. work enhances our understanding aids durable a-OER.

Language: Английский

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Oxyanion Engineering on RuO2 for Efficient Proton Exchange Membrane Water Electrolysis

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(47)

Published: Aug. 12, 2024

Abstract In acidic proton exchange membrane water electrolysis (PEMWE), the anode oxygen evolution reaction (OER) catalysts rely heavily on expensive and scarce iridium‐based materials. Ruthenium dioxide (RuO 2 ) with lower price higher OER activity, has been explored for similar task, but restricted by poor stability. Herein, we developed an anion modification strategy to improve performance of RuO in media. The designed multicomponent catalyst based sulfate anchored /MoO 3 displays a low overpotential 190 mV at 10 mA cm −2 stably operates 500 hours very degradation rate 20 μV h −1 electrolyte. When assembled PEMWE cell, this as shows excellent stability 150 h. Experimental theoretical results revealed that MoO could stabilize surface suppress its leaching during OER. Such ‐anchored not only reduces formation energy *OOH intermediate , also impedes both Ru lattice loss, thereby achieving high activity exceptional durability.

Language: Английский

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Local compressive strain-induced anti-corrosion over isolated Ru-decorated Co3O4 for efficient acidic oxygen evolution

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Nov. 4, 2024

Enhancing corrosion resistance is essential for developing efficient electrocatalysts acidic oxygen evolution reaction (OER). Herein, we report the strategic manipulation of local compressive strain to reinforce anti-corrosion properties non-precious Co3O4 support. The incorporation Ru single atoms, larger in atomic size than Co, into lattice (Ru-Co3O4), triggers localized compression and distortion on Co-O lattice. A comprehensive exploration correlation between this specific electrocatalytic performance conducted through experimental theoretical analyses. presence Ru-Co3O4 confirmed by operando X-ray absorption studies supported quantum calculations. This strain, presented a shortened bond length, enhances suppressing metal dissolutions. Consequently, shows satisfactory stability, maintaining OER over 400 hours at 30 mA cm−2 with minimal decay. study demonstrates potential effect fortifying catalyst stability beyond. crucial reaction. Here, authors improve Co3O4, demonstrating cm-2.

Language: Английский

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