Frank Partial Dislocation Pinning Effect Engineered IrNi Alloy Nanoparticles for Water Splitting

ACS Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 3378 - 3390

Published: Feb. 10, 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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Recent Development of Ir- and Ru-Based Electrocatalysts for Acidic Oxygen Evolution Reaction

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

Proton exchange membrane (PEM) water electrolyzers are one type of the most promising technologies for efficient, nonpolluting and sustainable production high-purity hydrogen. The anode catalysts account a very large fraction cost in PEM electrolyzer also determine lifetime electrolyzer. To date, Ir- Ru-based materials types acidic oxygen evolution reaction (OER), but they still face challenges high or low stability. Hence, exploring Ir stable electrocatalysts OER attracts extensive research interest recent years. Owing to these great efforts, significant developments have been achieved this field. In review, field comprehensively described. possible mechanisms first presented, followed by introduction criteria evaluation electrocatalysts. development then elucidated according strategies utilized tune catalytic performances. Lastly, future burgeoning is discussed.

Language: Английский

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Tuning α‐MnOOH Formation via Atomic‐Level Fe Introduction for Superior OER Performance

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 25, 2025

Abstract The arrangement of atoms in the catalyst directly impacts catalytic performance. Herein, a heteroatom doping strategy is found as an effective approach for regulation MnO 2 crystal reconstruction during oxygen evolution reaction (OER), thereby ensuring and optimizing performance catalyst. Real‐time tracking dynamic surface reveals that δ‐MnO transforms into less active γ‐MnOOH phase, while single‐atom Fe facilitates formation highly α‐MnOOH phase. asymmetric Fe─O─Mn bonds induce lattice distortions promote electron transfer from to Mn with increase 3 ⁺ content, which conducive intensifying spillover crucial factor OER activity. Theoretical calculations also demonstrate sites regulated representative can reduce energy barrier step process (the *O *OOH transition), thus significantly enhancing typical achieves successful processes through doping, holds significant implications developing new class catalysts, not limited catalysts reported this study.

Language: Английский

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Feasibility of Active and Durable Lattice Oxygen‐Mediated Oxygen Evolution Electrocatalysts in Proton Exchange Membrane Water Electrolyzers Through d⁰ Metal Ion Incorporation

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 28, 2025

Abstract The primary hurdle faced in the practical application of proton exchange membrane water electrolyzer (PEMWE) involves improving intrinsic kinetic activity oxygen evolution reaction (OER) electrocatalysts while concurrently enhancing their durability. Although based on lattice oxygen‐mediated mechanism (LOM) have potential to significantly enhance OER without being restricted by scaling relationships, they are neglected acidic electrolytes due limited In this study, an innovative approach is presented simultaneously promote activation and improve durability LOM‐based incorporating d 0 metal ions into RuO 2 electrocatalyst. Leveraging unique electronic properties ion, O 2p band center Ru‐O covalency electrocatalyst successfully engineered, resulting change mechanism. Furthermore, a single cell PEMWE, demonstrates outstanding performance, achieving 3.0 A cm −2 at 1.81 V maintaining for 100 h 200 mA , surpassing commercial . This strategy challenges traditional viewpoint that suppressing essential PEMWE durability, offering new perspectives development electrolytes.

Language: Английский

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Asymmetric Ru–O–Cr structure with stabilized oxygen vacancies for efficient Electrocatalytic Oxygen Evolution in Acid Media

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 139, P. 403 - 408

Published: May 24, 2025

Language: Английский

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Switchable Acidic Oxygen Evolution Mechanisms on Atomic Skin of Ruthenium Metallene Oxides

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 25, 2024

RuO2 has been considered as a promising, low-cost, and highly efficient catalyst in the acidic oxygen evolution reaction (OER). However, it suffers from poor stability due to inevitable involvement of lattice mechanism (LOM). Here, we construct unique metallene-based core-skin structure unveil that OER pathway atomic skin can be regulated LOM an adsorbate by altering core species metallene oxides metallenes. This switch is achieved without sacrificing number active sites, enabling Pd@RuO2 metallenes exhibit outstanding activity with low overpotential 189 mV at 10 mA cm–2, which 54 lower than counterpart PdO@RuO2 Additionally, they also robust negligible decay over 100 h 50 outperforming most reported RuO2-based catalysts. Multiple spectroscopic analyses theoretical calculations demonstrate Pd-metallene core, acting electron donor, increases migration energy subsurface atoms optimizes adsorption intermediates on Ru mechanism. Such offers novel way for tuning catalytic behaviors electrocatalysts.

Language: Английский

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In Situ Construction of IrO_x Nanofilm on TiO_x for Boosting Low‐Ir Catalysis in Practical PEM Electrolyze

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 10, 2025

Abstract Exploring low‐iridium (Ir) electrocatalysts for oxygen evolution reaction (OER) is exigent to promote the commercialization of proton electrolyte membrane water electrolyzers (PEMWEs). Herein, study presents a scalable and facile strategy in situ construct an IrO x nanofilm continuously coated on TiO support as efficient durable OER catalyst through one‐step annealing Ir‐salt‐adsorbed titanium‐based metal–organic frameworks (MOFs) precursor. The unique structure forms continuous p‐n junction interface, endowing strong interfacial electron transfer from also ensuring well‐connected conductive network anodic catalytic layer due dispersion . optimal requires low overpotential 233 mV at 10 mA cm −2 with 40‐fold com. 2 mass activity. assembled PEMWE shows cell voltage 1.762 V 1 A ≈220 h operation under start/shut‐down operation. Operando characterizations theoretical calculation reveal that not only reduces energy barrier dissociation deprotonation step *OOH boosting kinetics but prevents oxidation Ir sites form soluble species improves durability. This work offers new avenue rationally design synthesize low‐Ir application.

Language: Английский

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Tailoring Coordinated Steps with Ni-Substituted Co3o4 Asymmetric Active Unit for Durable and Efficient Acidic Water Oxidation

Published: Jan. 1, 2025

Language: Английский

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Advances in Ru-based Acidic OER Electrocatalysts: Addressing the Activity-Stability Trade-off

Published: April 1, 2025

Language: Английский

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