Unleashing the Potential of Metastable Materials in Electrocatalytic Water Splitting

ACS Materials Letters, Год журнала: 2025, Номер unknown, С. 524 - 543

Опубликована: Янв. 6, 2025

Electrocatalytic water splitting is pivotal for advancing the hydrogen economy, yet conventional stable-phase catalysts are constrained by rigid crystal structures and electronic states, leading to fixed active sites, limited adaptability, sluggish kinetics. Metastable materials emerge as promising alternatives due their structural flexibility tunable properties; however, dynamic regulatory mechanisms remain underexplored. This review uniquely offers a comprehensive analysis of metastable catalysts, emphasizing how factors such size, phase structure, properties, defects, interfaces significantly enhance catalytic performance. By dissecting range (metals, alloys, oxides, sulfides, nitrides, hydroxides), we elucidate precise modulation strategies that improve efficiency stability. Practical applications highlight superior adaptability activity compared traditional catalysts. Addressing key challenges technical bottlenecks, this provides innovative insights strategic directions optimizing materials, thereby efficient sustainable energy conversion technologies.

Язык: Английский

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Unlocking Peak Efficiency in Anion‐Exchange Membrane Electrolysis with Iridium‐Infused Ni/Ni₂P Heterojunction Electrocatalysts

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Abstract Developing cost‐effective, highly efficient, and durable bifunctional electrocatalysts for water electrolysis remains a significant challenge. Nickel‐based materials have shown promise as catalysts, but their efficiency in alkaline electrolytes is still lacking. Fascinatingly, Mott–Schottky catalysts can fine‐tune electron density at interfaces, boosting intermediate adsorption facilitating desorption to reduce the energy barrier. In this study, iridium‐implanted Ni/Ni 2 P nanosheets (Ir SA –Ni/Ni P) introduced, which are delivered from metal–organic framework employ them devices. This catalyst requires small 54 mV overpotential hydrogen evolution reaction (HER) 192 oxygen (OER) reach 10 mA·cm −2 1.0 m KOH electrolyte. Density functional theory (DFT) calculations reveal that incorporation of Ir atoms with enriched interfaces between Ni promote active sites be favorable HER OER. discovery highlights most likely reactive offers valuable blueprint designing efficient stable tailored industrial‐scale electrolysis. The ‐Ni/Ni electrode exhibits exceptional current outstanding stability single‐cell anion‐exchange membrane electrolyzer.

Язык: Английский

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Interface engineering strategies for enhanced electrocatalytic hydrogen evolution reaction

Energy Advances, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

The interface engineering includes intricate procedures for the development of heterostructures and heterojunctions, modifying composition at interface, optimizing interfacial area to enhance H 2 catalytic performance.

Язык: Английский

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Manifesting p‐d Orbital Hybridization Through Strategic D‐Band Engineering: A Pathway to Boosted Bifunctional HER/OER Electrochemical Performance in Self‐Templated Co‐SnO₂ Grown Over Co‐SnS₂ Nanosheets

Small Methods, Год журнала: 2025, Номер unknown

Опубликована: Май 29, 2025

Abstract In this study, Co‐doped SnO 2 is synthesized atop the hexagonal CoS template (CoSS) via direct air calcination of as‐synthesized SnS (CoS) nanosheets. The structural evolution facilitated emergence Co 2+ and 3+ states, complemented by surface‐adsorbed sulfur oxyanions (SO 4 2− , HSO 3 ‐ SO ). CoSS deposited over carbon cloth (CoSS/CC) exhibited superior bifunctional HER OER, demonstrating higher stability efficiency than their CoS/CC counterparts. Notably, CoSS/CC||CoSS/CC shows overall water splitting at a minimum cell voltage 1.5 V, significantly lower CoS/CC||CoS/CC. Mechanistically, states serve as catalytically active sites that enhance while synergistic interaction between promotes activities. Density functional theory (DFT) calculations revealed an upshifted d‐band centre (ɛ d ) enhanced metal‐oxygen covalency (Δ) in CoSS, with charge transfer p‐d hybridization. ATR‐FTIR, Raman, XPS investigations confirmed surface reconstruction CoSS/CC electrodes electrical conductivity. It related highly strained system V O ‐CoSS has more unfilled electronic near Fermi level F to facilitate stable HER/OER intermediates. Overall, study underscores electrocatalytic CoS/CC, establishing it promising candidate for efficient splitting.

Язык: Английский

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Cobalt Substitution on SnS-rGO Composites for Efficient Oxygen and Hydrogen Evolution Reactions

Energy & Fuels, Год журнала: 2024, Номер 38(17), С. 16861 - 16872

Опубликована: Авг. 8, 2024

To overcome the high cost of established electrocatalysts (viz., Pt/C and RuO2), there is a pressing need to replace them with highly efficient, cost-effective, sustainable electrocatalysts. In this study, series Co-substituted orthorhombic tin sulfide-reduced graphene oxide (SnS-rGO) [CTSx-rGO, (x: 0.1 0.3)] catalysts were produced via one-pot hydrothermal process. potassium hydroxide (1.0 mol/L), CTSx-rGO acts as competent stable catalyst for both oxygen evolution reaction (OER) hydrogen (HER) owing cumulative effect Co SnS-rGO composites. substitution improves electrochemical active surface area (ECSA), reduces Rct (charge-transfer resistance), tunes electronic configuration. The resulting CTS0.2-rGO composite exhibited exceptional performance toward OER HER activities by offering relatively small overpotentials 323.0 233.1 mV at 20 mA/cm2, respectively, long-term stability up 50 h ECSA that attributable improvement specific ample sites from in situ structural morphology change substitution. This work facilitates strengthens development an efficient SnS-rGO-based heterostructure electrocatalyst overall water splitting.

Язык: Английский

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