標題: Bifunctional cobalt phosphide nanoparticles with convertible surface structure for efficient electrocatalytic water splitting in alkaline solution
作者: Wang, Miao
Dong, Chung-Li
Huang, Yu-Cheng
Shen, Shaohua
電子物理學系
Department of Electrophysics
關鍵字: Cobalt hydroxides;Cobalt phosphides;Electrocatalysis;Surface structures;Overall water splitting
公開日期: 1-Mar-2019
摘要: Highly efficient non-noble materials for water splitting are essential for renewable energy application. Herein, cobalt phosphide nanoparticles with high P/Co ratio are synthesized and display overpotentials of 348 mV (or 343 mV) for oxygen evolution reaction (OER) with surface oxidized active species formed and 200 mV (or 184 mV) for hydrogen evolution reaction (HER) in 1 M NaOH (or 1 M KOH) at 10 mA cm(-2). The improved OER could be ascribed to the smaller particle size for increased active site number and more importantly the improved intrinsic activity probably assisted by more phosphates formed during electrocatalytic reaction; while the improved HER performance is mainly attributed to the increased active sites in the form of Co-P bonds. In a two-electrode configuration, the catalysts exhibit excellent overall water splitting performance, with 10 mA cm(-2) at 1.58 V and a long-time reaction stability without attenuation during 10 h operation. (C) 2019 Elsevier Inc. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jcat.2019.02.014
http://hdl.handle.net/11536/151933
ISSN: 0021-9517
DOI: 10.1016/j.jcat.2019.02.014
期刊: JOURNAL OF CATALYSIS
Volume: 371
起始頁: 262
結束頁: 269
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