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Electron Manipulation and Surface Reconstruction of Bimetallic Iron-Nickel Phosphide Nanotubes for Enhanced Alkaline Water Electrolysis.


ABSTRACT: Developing high-efficiency and stable bifunctional electrocatalysts for water splitting remains a great challenge. Herein, NiMoO4 nanowires as sacrificial templates to synthesize Mo-doped NiFe Prussian blue analogs are employed, which can be easily phosphorized to Mo-doped Fe2xNi2(1-x)P nanotubes (Mo-FeNiP NTs). This synthesis method enables the controlled etching of NiMoO4 nanowires that results in a unique hollow nanotube architecture. As a bifunctional catalyst, the Mo-FeNiP NTs present lower overpotential and Tafel slope of 151.3 (232.6) mV at 100 mA cm-2 and 76.2 (64.7) mV dec-1 for HER (OER), respectively. Additionally, it only requires an ultralow cell voltage of 1.47 V to achieve 10 mA cm-2 for overall water splitting and can steadily operate for 200 h at 100 mA cm-2. First-principles calculations demonstrate that Mo doping can effectively adjust the electron redistribution of the Ni hollow sites to optimize the hydrogen adsorption-free energy for HER. Besides, in situ Raman characterization reveals the dissolving of doped Mo can promote a rapid surface reconstruction on Mo-FeNiP NTs to dynamically stable (Fe)Ni-oxyhydroxide layers, serving as the actual active species for OER. The work proposes a rational approach addressed by electron manipulation and surface reconstruction of bimetallic phosphides to regulate both the HER and OER activity.

SUBMITTER: Wang X 

PROVIDER: S-EPMC11234420 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature

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Electron Manipulation and Surface Reconstruction of Bimetallic Iron-Nickel Phosphide Nanotubes for Enhanced Alkaline Water Electrolysis.

Wang Xinqiang X   Zhou Jinhao J   Cui Wengang W   Gao Fan F   Gao Yong Y   Qi Fulai F   Liu Yanxia Y   Yang Xiaoying X   Wang Ke K   Li Zhenglong Z   Yang Yaxiong Y   Chen Jian J   Sun Wenping W   Sun Lixian L   Pan Hongge H  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20240505 26


Developing high-efficiency and stable bifunctional electrocatalysts for water splitting remains a great challenge. Herein, NiMoO<sub>4</sub> nanowires as sacrificial templates to synthesize Mo-doped NiFe Prussian blue analogs are employed, which can be easily phosphorized to Mo-doped Fe<sub>2x</sub>Ni<sub>2(1-x)</sub>P nanotubes (Mo-FeNiP NTs). This synthesis method enables the controlled etching of NiMoO<sub>4</sub> nanowires that results in a unique hollow nanotube architecture. As a bifunctio  ...[more]

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