CoSe2 nanocrystals embedded into carbon support as coralline-like catalysts for hydrogen evolution reaction
CoSe2 nanocrystals embedded into carbon support as coralline-like catalysts for hydrogen evolution reaction
复制标题
嵌入碳载体中的 CoSe2 纳米晶体作为析氢反应的珊瑚状催化剂
DOI：
10.1016/j.ijhydene.2019.07.031
复制
发表时间：
2019-08-30
影响因子：
7.2
通讯作者：
Wen, Zhenhai
中科院分区：
文献类型：
--
作者：
Zhao, Linghui;Jia, Jingchun;Wen, Zhenhai
开发一种活性高、稳定性好、价格低廉的析氢反应(HER)催化剂对电化学析氢具有重要意义。采用Co纳米晶负载碳载体(XC-72R)和硒化反应合成CoSe2/C纳米晶的高温反应方法，研究了温度对CoSe2/C纳米晶的影响。在0.5M的H_2SO_4中，比较了不同温度下热处理的CoSe2/C纳米晶的形貌和催化性能。结果表明，珊瑚状CoSe2/C-650纳米晶对HER有很高的性能，Tafel斜率为45.73 mV.dec(-1)，起始电位为-196 mV vs RHE。稳定时间至少为40h，H-2的法拉第效率(FE)接近98%。CoSe2/C-650之所以具有优异的HER性能，是因为CoSe2纳米晶镶嵌在导电材料XC-72R中，不仅提供了丰富的活性中心，而且提高了HER过程中的电荷传输能力。(C)2019氢能出版有限责任公司。爱思唯尔有限公司出版。保留所有权利。
It is vital to develop a high activity, stability and inexpensive hydrogen evolution reaction (HER) catalyst for electrochemical hydrogen evolution. A high-temperature reaction approach that is Co nanocrystals on carbon support (XC-72R) and selenylation to synthetize CoSe2/C nanocrystals is used, and the effect of temperature on CoSe2/C nanocrystals is studied. The morphology and catalytic properties of CoSe2/C nanocrystals annealed at different temperatures are compared in 0.5 M H2SO4. The results indicated the corallinelike CoSe2/C-650 nanocrystals have a high performance for HER with Tafel slopes of 45.73 mV.dec(-1) and onset potential of -196 mV vs. RHE. The stability maintained for at least 40 h and the Faraday Efficiency (FE) of H-2 is nearly 98%. The outstanding HER performance of CoSe2/C-650 is due to its characteristic cora-like frame CoSe2 nanocrystals embedded into supernal conductive XC-72R, which not only offer affluent active reaction sites, but also boost the capacity of charge transportation in HER process. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.