标题：Porous coordination polymer-derived ultrasmall CoP encapsulated in nitrogen-doped carbon for efficient hydrogen evolution in both acidic and basic media
作者：Liu, Shuai; Jiang, Anning; Wang, Zegao; Lin, Mengxia; Xia, Dan; Li, Qiang; Dong, Mingdong
作者机构：[Liu, Shuai; Lin, Mengxia; Xia, Dan] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China.; [Liu, Shuai; Lin, Mengxia; Xia, Dan] 更多
通讯作者：Xia, D;Xia, D;Li, Q;Li, Q;Dong, MD
通讯作者地址：[Xia, D]Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China;[Xia, D]Tianjin Key Lab Mat Laminating Fabricat & Interfa, Tianjin 300 更多
来源：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
关键词：Cobalt phosphide; Nitrogen-doped graphitic carbon layer; Hydrogen; evolution reaction; Porous coordination polymer; Electrocatalyst
摘要：Exploiting high-efficient and stable non-precious metal-based electrocatalysts toward hydrogen evolution reaction (HER) is of enormous significance to address the shortage of global power source, but there remain major challenges. Here we present a facile and controllable strategy to synthesize a strongly coupled ultrasmall-cobalt phosphide/nitrogen-doped graphitic carbon (u-CoP@NC) hybrid structure via phosphorization from a porous coordination polymer (PCP) precursor. The PCP-derived u-CoP@NC exhibits remarkable activity and stability for HER, achieving a current density of 10 mA cm(-2) with a low overpotential of 131 mV in acidic media and 111 mV in basic media. The corresponding Tafel slopes present in acidic and basic media are 62.7 and 70.3 mV dec(-1), respectively. Results reveal that the enhanced electrocatalytic performance of u-CoP@NC originates from the strongly coupled u-CoP nanoparticles and graphitic carbon layer, and the perfect dispersity of the active sites. This research opens up new avenues for designing earth abundant metal-based electrocatalysts with high capability for water splitting applications. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.