Modulating electronic structure of CoS2 nanorods by Fe doping for efficient electrocatalytic overall water splitting

Nano Energy, Journal Year: 2024, Volume and Issue: unknown, P. 110564 - 110564

Published: Dec. 1, 2024

Language: Английский

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Insights into the pH effect on hydrogen electrocatalysis

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

This review systematically provides various insights into the pH effect on hydrogen electrocatalysis, and thus providing a reference for future development of electrocatalysis based these insights.

Language: Английский

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Synergistic Atomic Environment Optimization of Nickel–Iron Dual Sites by Co Doping and Cr Vacancy for Electrocatalytic Oxygen Evolution

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

Published: Jan. 8, 2025

The dual-site synergistic catalytic mechanism on NiFeOOH suggests weak adsorption of Ni sites and strong Fe limited its activity toward alkaline oxygen evolution reaction (OER). Large-scale density functional theory (DFT) calculations confirm that Co doping can increase adsorption, while the metal vacancy reduce adsorption. combined two factors further modulate atomic environment optimize free energy oxygen-containing intermediates, thus enhancing OER activity. Accordingly, we used Cr vacancies to fabricate an amorphous catalyst VCr,Co-NiFeOOH. It provides overpotential 239 mV at 100 mA cm–2 high stability over 500 h with a ∼98% potential retention. resulting water electrolyzer based anion exchange membrane (AEM) exhibits remarkable performance 1 A 1.68 V in M KOH. XPS, soft-XAS, XANES Bader charge analysis results reveal regulation local microenvironment valence state by doping, improving sites. alleviate DFT effect redistribute Ni/Fe sites, d-band center Fe, endow Ni–Fe dual barrier rate-determining step.

Language: Английский

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Molecular Weight Engineering Modulates Lignin‐Metal Supramolecular Framework to Construct Carbon‐Coated CoRu Alloy for Effective Overall Water Splitting

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

Published: Feb. 25, 2025

Abstract To overcome the challenges of low catalytic activity and instability, a molecular weight engineering strategy coupled with oxidative ammonolysis is developed to synthesize CoRu‐based alloy catalysts distinct morphologies properties from biorefinery lignin. This approach effectively modulates intrinsic active sites exposes unsaturated nitrogen‐oxygen structures, thereby tailoring morphology defect structure carbon layers in catalysts. The as‐synthesized CoRu lignin precursors varying weights are designated as CoRu@OALC‐EtOAC, CoRu@OALC‐EtOH, CoRu@OALC‐Residual. featuring defect‐rich graphitic carbon‐coated structure, exhibited exceptional overall water‐splitting performance (1.48 V at 10 mA cm −2 ), significantly surpassing Pt/C || Ru/C (1.58 ). In contrast, CoRu@OALC‐Residual, its amorphous demonstrated remarkable stability (350 h 100 vastly outperforming (6 In‐situ Raman spectroscopy DFT calculations revealed that adsorb * H intermediates, accelerating process. strong adsorption also induces layer rearrangement, leading dissolution oxidation metal particles. provides universal method for biomass‐derived catalysts, establishing direct relationship between weight, catalyst morphology, electrocatalytic performance.

Language: Английский

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From design to efficiency: cobalt-based MOFs for efficient and stable electrocatalysis in hydrogen and oxygen evolution reactions

RSC Advances, Journal Year: 2025, Volume and Issue: 15(11), P. 8420 - 8429

Published: Jan. 1, 2025

This study systematically explores how variations in linker chemistry affect metal-active site distribution, stability, and reaction kinetics, providing a deeper understanding of structure/morphological-performance relationships.

Language: Английский

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Cross‐Scale Process Intensification of Spindle CuO Supported Tungsten Single‐Atom Catalysts toward Enhanced Electrochemical Hydrogen Production

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 15, 2024

Abstract Process intensification engineering of electrocatalysts is crucial to facilitate electrocatalytic reaction, while its cross‐scale modulation great challenge. Herein, the spindle CuO supported tungsten single‐atom catalysts (W SACs) with tunable mesoscale electric field and atomic‐scale coordination structure are reported toward enhanced electrochemical hydrogen evolution process. Finite element analysis indicates can be by tailoring tip angle configuration from 74° 27°, enhancing production rate 5 times. Based on density functional theory calculations, regulation also triggers increase number W–O, which increases charge transfer downshifts d‐band center, stabilizing W sites optimizing desorption The optimized SA /CuO‐27 exhibits much better activity (η 100 = 94 mV) stability (200 mA cm −2 for 120 h) than as‐prepared /CuO‐56 /CuO‐74 analogues. Impressively, anion exchange membrane electrolyzer fabricated presents excellent comparable that commercial electrocatalysts, delivers an ultra‐low attenuation 0.085 h −1 at 300 after continuous electrocatalysis h. This work inspires design high‐efficiency metal synthesis via process engineering.

Language: Английский

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Transition metal single-atom catalysts for water splitting: Unravelling coordination strategies and catalytic mechanisms for sustainable hydrogen generation

Next Materials, Journal Year: 2025, Volume and Issue: 6, P. 100491 - 100491

Published: Jan. 1, 2025

Language: Английский

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Development of Electrochemical Water Splitting with Highly Active Nanostructured NiFe Layered Double Hydroxide Catalysts: A Comprehensive Review

Catalysts, Journal Year: 2025, Volume and Issue: 15(3), P. 293 - 293

Published: March 20, 2025

Electrochemical water splitting is a feasible and effective method for attaining hydrogen, offering mechanism renewable energy solutions to combat the world’s crises due scarcity of fossil fuels. Evidently, viability stability electrocatalysts are fundamental electrochemical water-splitting process. However, net efficiency this process noticeably hindered by kinetic drawbacks related OER. Hence, NiFe LDH has been widely used as highly efficient OER HER catalyst material its unique nanostructure, tunable composition, favorable electronic structure. This review offers systematic analysis latest progress in fabrication functional catalysts associated strategies, structure optimizations, performance improvements. Special emphasis given understanding role nanostructure engineering increasing active site accessibility, enhancing effectiveness subsequent electron transfer, boosting intrinsic catalytic activity Moreover, we discuss influence doping, defects, formation heterostructures with other materials on activities LDHs. Additional accounts basic structures provided, along an enhanced theoretical based DFT studies LDH. limitations potential developments work focus need existing synthesis approaches, catalysts, their insertion into working processes. comprehensive current state research use foster improved development sustainable hydrogen sources future.

Language: Английский

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Tuning the catalytic microenvironment by incorporating P atoms into Co9S8 with enhanced water splitting catalytic activity

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 163531 - 163531

Published: May 1, 2025

Language: Английский

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Strong Interaction between Molybdenum Compounds and Mesoporous CMK‐5 Supports Boosts Hydrogen Evolution Reaction

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(48)

Published: July 16, 2024

Abstract Strong metal‐support interaction (SMSI) between transition metal nanoparticles and carbon matrix offers significant structure advantages due to the ability modulate electronic of nanoparticles, increase density active sites, improve conductivity catalysts. Here, ultrafine metallic molybdenum compounds (MoP, Mo 2 C, MoS ) strongly coupled with mesoporous CMK‐5 are synthesized. The confinement growth in pores produces encapsulated affording facilitated electron transfer, enhancing HER activity induced by SMSI effect. hierarchical nanostructure strong interactions substrate molybdenum‐based allow efficient mass/electron transport improving catalytic hydrogen evolution reaction (HER) activity. effective exchange species support is studied X‐ray photoelectron spectroscopy (XPS) measurement, confirming presence resulting MoP/CMK‐5 catalyst exhibits outstanding performance alkaline (65 mV@10 mA cm −2 ), acidic (123 simulated seawater electrolytes (103 making it one most promising catalysts reported for HER. This work provides guidance on designing high‐performance electrocatalysts enhancement electrochemical reaction.

Language: Английский

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