文献类型：期刊文献

英文题名：Synthesis of an Ultrafine CoP Nanocrystal/Graphene Sandwiched Structure for Efficient Overall Water Splitting

作者：Li, Liang[1];Wang, Xinran[1];Guo, Ying[1];Li, Jinxin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Lab Low Dimens Mat, Shanghai 200237, Peoples R China

年份：2020

卷号：36

期号：8

起止页码：1916

外文期刊名：LANGMUIR

收录：;EI(收录号：20200908246542);WOS:【SCI-EXPANDED(收录号:WOS:000518234900008)】；

语种：英文

外文关键词：Nanocrystals - Catalyst activity - Potassium hydroxide

摘要：A CoP/graphene composite was synthesized through a coprecipitation and in situ phosphorization protocol using alpha-Co(OH)(2) and graphene oxide as precursors. The similar two-dimensional layered structures ensured evenly attached alpha-Co(OH)(2) nanosheets on the graphene oxide support and the formation of a sandwich-like structure. The sequential in situ phosphorization strategy not only generated a high density of ultrafine CoP nanocrystals but also simultaneously reduced the graphene oxide support. The enough exposed active sites combined with a highly conductive matrix resulted in an excellent electrochemical catalyst for overall water splitting. The overpotential is only 125 mV at 10 mA.cm(2) in 0.5 M H2SO4. Good electrocatalytic performance was also exhibited in alkaline conditions for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The overpotential is 119 mV for HER and 374 mV for OER at 10 mA.cm(2) in 1 M KOH. More importantly, the composite exhibited much higher exchange current densities during HER processes (1.64 x 10(-4) A.cm(-2) in 0.5 M H2SO4 and 2.93 x 10(-4) A.cm(-2) in 1 M KOH) when compared with similar materials reported before. This low-cost, simple, and efficient approach is suitable for mass production and practical applications.