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Al-Induced In Situ Formation of Highly Active Nanostructured Water-Oxidation Electrocatalyst Based on Ni-Phosphide

Abstract : We report a simple low-cost concept for the preparation of water-oxidation electrocatalyst via modification of self-supported Ni5P4-Ni2P foam catalyst precursor with Al. As an anode for alkaline oxygen evolution reaction, this material exhibits an impressive Tafel slope of 27 mV dec(-1) and offers anodic current densities of 10, 100, and 300 mA cm(-2) at overpotentials of merely 180, 247, and 312 mV, respectively. Moreover, the anode demonstrates high operational stability, as reflected by a steady-state performance for more than 8 days. Combining state-of-the-art electron microscopy and photoelectron spectroscopy, we investigated the role of the Al dopant in the formation of active Ni(OH)(2)/NiO/Ni5P4-Ni2P nanocatalyst, which exhibits oxygen-evolving activity among the highest reported to date.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02174404
Contributor : Université Normandie <>
Submitted on : Friday, July 5, 2019 - 9:52:56 AM
Last modification on : Saturday, July 6, 2019 - 1:30:33 AM

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Junyuan Xu, Juliana P. S. Sousa, Natalia E. Mordvinova, Jose Diogo Costa, Dmitri Y. Petrovykh, et al.. Al-Induced In Situ Formation of Highly Active Nanostructured Water-Oxidation Electrocatalyst Based on Ni-Phosphide. ACS Catalysis, American Chemical Society, 2018, 8 (3), pp.2595-2600. ⟨10.1021/acscatal.7b03817⟩. ⟨hal-02174404⟩

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