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

TitleAl-Induced In Situ Formation of Highly Active Nanostructured Water-Oxidation Electrocatalyst Based on Ni-Phosphide
Publication TypeJournal Article
Year of Publication2018
AuthorsXu, JY, Sousa, JPS, Mordvinova, NE, Costa, JD, Petrovykh, DY, Kovnir, K, Lebedev, OI, ko, YV
JournalAcs Catalysis
Volume8
Pagination2595-2600
Date Published03
Type of ArticleArticle
ISBN Number2155-5435
Accession NumberWOS:000426804100109
Keywordschemistry, conversion, efficient, electrode, foam, Graphene, hydrogen evolution, in situ catalyst formation, metal, nickel phosphide, OER, oxygen-evolving catalysts, PGM-free catalyst, sacrificial Al
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.

DOI10.1021/acscatal.7b03817
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Not AL