Versatile Route To Fabricate Precious-Metal Phosphide Electrocatalyst for Acid-Stable Hydrogen Oxidation and Evolution Reactions.

Author(s) Pu, Z.; Liu, T.; Zhao, W.; Shi, X.; Liu, Y.; Zhang, G.; Hu, W.; Sun, S.; Liao, S.
Journal ACS Appl Mater Interfaces
Date Published 2020 Mar 11

Highly active catalyst for the hydrogen oxidation/evolution reactions (HOR and HER) plays an essential role for the water-to-hydrogen reversible conversion. Currently, increasing attention has been concentrated on developing low-cost, high-activity, and long-life catalytic materials, especially for acid media due to the promise of proton exchange membrane (PEM)-based electrolyzers and polymer electrolyte fuel cells. Although non-precious-metal phosphide (NPMP) catalysts have been widely researched, their electrocatalytic activity toward HER is still not satisfactory compared to that of Pt catalysts. Herein, a series of precious-metal phosphides (PMPs) supported on graphene (rGO), including IrP-rGO, RhP-rGO, RuP-rGO, and PdP-rGO, are prepared by a simple, facile, eco-friendly, and scalable approach. As an example, the resultant IrP-rGO displays better HER electrocatalytic performance and longer durability than the benchmark materials of commercial Pt/C under acidic, neutral, and basic electrolytes. To attain a current density of 10 mA cm, IrP-rGO shows overpotentials of 8, 51, and 13 mV in 0.5 M dilute sulfuric acid, 1.0 M phosphate-buffered saline (PBS), and 1.0 M potassium hydroxide solutions, respectively. Additionally, IrP-rGO also exhibits exceptional HOR performance in the 0.1 M HClO medium. Therefore, this work offers a vital addition to the development of a number of PMPs with excellent activity toward HOR and HER.

DOI 10.1021/acsami.9b23426
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2020;12(10):1173711744.

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