Exploring Ni-Based Alkaline OER Catalysts: A Comprehensive Review of Structures, Performance, and In Situ Characterization Methods

DeCarbon, Год журнала: 2025, Номер unknown, С. 100097 - 100097

Опубликована: Янв. 1, 2025

Язык: 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, Год журнала: 2025, Номер unknown

Опубликована: Май 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.

Язык: Английский

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Ru Nanoparticle Assemblies Modified with Single Mo Atoms for Hydrogen Evolution Reactions in Seawater Electrocatalysis

Catalysts, Год журнала: 2025, Номер 15(5), С. 475 - 475

Опубликована: Май 12, 2025

Ru-based catalysts manifest unparalleled hydrogen evolution reaction (HER) performance, but the hydrolysis of Ru species and accumulation corresponding intermediates greatly limit HER activity stability. Herein, nanoparticle assemblies modified with single Mo atoms supported on N-incorporated graphene (referred to as MoRu-NG) are compounded via hydrothermal chemical vapor deposition (CVD) methods. The incorporation into lattices modifies local atomic milieu around centers, significantly improving catalytic behavior More specifically, MoRu-NG achieves overpotentials 53 mV 28 at 10 mA cm−2, exceptional stability in acidic alkaline seawater solutions, respectively. In MoRu-NG, have a special electronic structure thus possess optimal adsorption energy, which indicates that excellent mainly hinges upon centers. To be specific, d-electron orbitals close half full, giving moderate bond energy for assimilation release hydrogen, is beneficial conversion intermediates. Moreover, facilitates formation O O’-bidentate ligands, enhancing structural universal-pH electrolysis. This work advances feasible construction method hexagonal octahedral configuration (Ru-O-Mo-N-C) provides route synthesize an efficient stable catalyst electrocatalytic seawater.

Язык: Английский

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Alternating current and electrolyte engineering-promoted surface reconstruction of NiFeOxHy catalysts for amper-level oxygen evolution reaction

Journal of Colloid and Interface Science, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 1, 2024

Язык: Английский

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