Engineering High‐Density Grain Boundaries in Ru_0.8Ir_0.2O_x Solid‐Solution Nanosheets for Efficient and Durable OER Electrocatalysis

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

Published: March 23, 2025

Abstract The oxygen evolution reaction (OER) in proton exchange membrane water electrolyzers (PEMWE) has long stood as a formidable challenge for green hydrogen sustainable production, hindered by sluggish kinetics, high overpotentials, and poor durability. Here, these barriers are transcended through novel material design: strategic engineering of high‐density grain boundaries within solid‐solution Ru 0.8 Ir 0.2 O x ultrathin nanosheets. These carefully tailored synergistic Ir─Ru interactions, reduce the coordination atoms optimize distribution charge, thereby enhancing both catalytic activity stability nanosheets, verified merely requiring an overpotential 189 mV to achieve 10 mA cm −2 acidic electrolyte. In situ electrochemical techniques, complemented theoretical calculations, reveal that OER follows adsorption mechanism, demonstrating pivotal role boundary electronic modulation accelerating kinetics. Most notably, exhibits outstanding industrial‐scale performance PEMWE, reaching 4.0 A at 2 V maintaining >1000 h 500 . This efficiency reduces production costs $0.88 kg −1 work marks transformative step forward designing efficient, durable catalysts, offering promising pathway toward technologies advancing global transition energy.

Language: Английский

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Real Active Site Identification of Co/Co₃O₄ Anchoring Ni-MOF Nanosheets with Fast OER Kinetics for Overall Water Splitting

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(15), P. 7045 - 7052

Published: April 3, 2024

Doping metals and constructing heterostructures are pivotal strategies to enhance the electrocatalytic activity of metal–organic frameworks (MOFs). Nevertheless, effectively designing MOF-based catalysts that incorporate both doping multiphase interfaces poses a significant challenge. In this study, one-step Co-doped Co3O4-modified Ni-MOF catalyst (named Ni NDC-Co/CP) with thickness approximately 5.0 nm was synthesized by solvothermal-assisted etching growth strategy. Studies indicate formation Co–O–Ni–O-Co bond in NDC-Co/CP found facilitate charge density redistribution more than Co–O–Ni bimetallic synergistic effect NiCo NDC/CP. The designating achieved superior oxygen evolution reaction (OER) (245 mV @ 10 mA cm–2) robust long stability (100 h 100 1.0 M KOH. Furthermore, NDC-Co/CP(+)||Pt/C/CP(−) displays pregnant overall water splitting performance, achieving current cm–2 at an ultralow voltage 1.52 V, which is significantly lower commercial electrolyzer using Pt/C IrO2 electrode materials. situ Raman spectroscopy elucidated transformation NDC-Co Ni(Co)OOH under electric field. This study introduces novel approach for rational design OER electrocatalysts.

Language: Английский

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Metal-organic-framework-derived dual-atom catalysts: from synthesis to electrocatalytic applications

Materials Science and Engineering R Reports, Journal Year: 2024, Volume and Issue: 162, P. 100886 - 100886

Published: Nov. 23, 2024

Language: Английский

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Tuning the Inter‐Metal Interaction between Ni and Fe Atoms in Dual‐Atom Catalysts to Boost CO2 Electroreduction

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(44)

Published: Aug. 8, 2024

Abstract Dual‐atom catalysts (DACs) are promising for applications in electrochemical CO 2 reduction due to the enhanced flexibility of catalytic sites and synergistic effect between dual atoms. However, precisely controlling atomic distance identifying dual‐atom configuration DACs optimize performance remains a challenge. Here, Ni Fe pairs were constructed on nitrogen‐doped carbon support three different configurations: NiFe‐isolate, NiFe‐N bridge, NiFe‐bonding. It was found that bridge catalyst with NiN 4 FeN sharing two N atoms exhibited superior activity stability when compared NiFe‐isolate NiFe‐bonding catalysts. A series characterizations density functional theory calculations suggested N‐bridged NiFe an appropriate can exert more pronounced synergy. not only regulated suitable adsorption strength *COOH intermediate but also promoted desorption *CO, thus accelerating electroreduction CO. This work provides important implication enhancement catalysis by tailoring coordination structure DACs, identification neighboring

Language: Английский

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Asymmetric Microenvironment Tailoring Strategies of Atomically Dispersed Dual‐Site Catalysts for Oxygen Reduction and CO₂ Reduction Reactions

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(41)

Published: Aug. 17, 2024

Dual-atom catalysts (DACs) with atomically dispersed dual-sites, as an extension of single-atom (SACs), have recently become a new hot topic in heterogeneous catalysis due to their maximized atom efficiency and dual-site diverse synergy, because the synergistic diversity dual-sites achieved by asymmetric microenvironment tailoring can efficiently boost catalytic activity optimizing electronic structure DACs. Here, this work first summarizes frequently-used experimental synthesis characterization methods Then, four mechanisms (cascade mechanism, assistance co-adsorption mechanism bifunction mechanism) key modulating (active site strategy, transverse/axial-modification engineering, distance engineering strain engineering) are elaborated comprehensively. The emphasis is placed on effects DACs oxygen/carbon dioxide reduction reaction. Finally, some perspectives outlooks also addressed. In short, review useful strategy speed up high-performance electrocatalysts for different reactions.

Language: Английский

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