Magnesium-doped Nickel-iron (Hyro)oxides-based Catalyst for Efficient and Stable Hydrogen Evolution

Molecular Catalysis, Journal Year: 2025, Volume and Issue: 574, P. 114885 - 114885

Published: Feb. 1, 2025

Language: Английский

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Ferrocene-MOFs: Optimizing OER Kinetics for Water Splitting

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 27, 2025

Optimizing the adsorption and desorption kinetics of oxygen evolution reaction (OER) is crucial for efficient overall water splitting. Herein, we report a series porous ferrocene-based metal–organic framework (MFc-MOF, M = Co, Ni, Fe, Mn) nanoflowers featuring close π–π stacking lattice structure as model catalysts, explore structure–activity relationship. Operando electrochemical impedance spectroscopy implies that synthesized CoFc-MOF@NF facilitates intermediate desorption. It exhibits an ultralow overpotential 189 mV at 10 mA cm–2 maintains stability 250 h. In splitting device, when serves anode, it yields significantly lower cell voltage than commercial RuO2 shows excellent 100 situ Raman reveals surface transforms into CoFeOOH, OER-active species, while preserving MOF framework. The inner MOF's ferrocene units act electron-transfer mediators. These findings highlight CoFc-MOF@NF's potential leading catalyst sustainable hydrogen production, combining high catalytic activity, rapid kinetics, robust stability. This work presents new approach to balance activity in MOF-based OER catalysts.

Language: Английский

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Tuning the Electronic Structure of Ni₂P through Fe Doping to Trigger the Lattice-Oxygen-Mediated Oxygen Evolution Reaction

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

Developing cost-effective electrocatalysts for efficient seawater splitting requires a fundamental understanding of the oxygen evolution reaction (OER) mechanism. Herein, iron-doped nickel phosphide (Fe-Ni2P) is synthesized via hydrothermal-impregnation-phosphidation strategy to investigate role Fe incorporation in modulating electronic structure and OER pathways. Mechanistic investigations demonstrate that doping triggers shift from adsorbate mechanism (AEM) lattice oxygen-mediated (LOM) pathways, evidenced by pH-dependent kinetics, tetramethylammonium cation probing, situ electrochemical impedance spectroscopy (EIS). The LOM involves nonconcerted proton-electron transfers, facilitated accelerated hydroxide adsorption (ks = 0.275 s-1) dynamic surface reconstruction into amorphous NiOOH. reduced activation energy (27.1 kJ mol-1) lower charge-transfer resistance Fe-Ni2P underscore its superior thermodynamics kinetics. X-ray photoelectron EIS further validate vacancy accumulation during process. Electrochemical studies reveal exhibits low overpotential 220 mV at 10 mA cm-2 remarkable stability through phosphate-mediated Cl- repulsion involving alkaline seawater. This work establishes Fe-induced modulation as critical activating LOM-dominated catalysis transition metal phosphides.

Language: Английский

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Thermally activated growth of ternary oxyhydroxides on perovskites for efficient water oxidation

Chemical Communications, Journal Year: 2024, Volume and Issue: 60(70), P. 9380 - 9383

Published: Jan. 1, 2024

Perovskite oxides are promising catalysts for water oxidation. Herein, we constructed a Sr

Language: Английский

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Boron-doped diamond composites for durable oxygen evolution

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 677, P. 675 - 682

Published: Aug. 15, 2024

Language: Английский

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