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Ultrafine Cobalt‐Doped Iron Disulfide Nanoparticles in Ordered Mesoporous Carbon for Efficient Hydrogen Evolution
Author(s) -
Huang Guoqing,
Xu Shaonan,
Liu Zhipeng,
Yuan Shisheng,
Zhang Cong,
Ai Jing,
Li Nan,
Li Xiaotian
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201901759
Subject(s) - overpotential , materials science , mesoporous material , tafel equation , chemical engineering , catalysis , nanoparticle , carbon fibers , inorganic chemistry , electrolyte , nanotechnology , electrode , chemistry , electrochemistry , organic chemistry , composite material , composite number , engineering
Abstract Designing earth‐abundant and efficient electrocatalysts to replace noble metals is highly desired for the hydrogen evolution reaction (HER) in water electrolysis. In this study, we constructed a self‐supported electrode with ordered mesoporous carbon film coated carbon fibers as a substrate and Co doped FeS 2 nanoparticles as catalytically active phase for the HER. The ordered mesoporous carbon served as nanoreactor to restrict the growth of sulfide particles and prevent them from agglomeration, leading to the formation of ultrafine and highly dispersed sulfide of ∼5 nm, which enables the exposure of abundant active sites. Meanwhile, the Co atom doping enhanced the adsorption of the catalyst towards hydrogen, thereby improving its intrinsic activity. As a result, the electrode exhibited outstanding catalytic activity for the HER in acid electrolyte, manifesting a current density of 10 mA cm −2 at an overpotential of 92 mV and a small Tafel slope of 59 mV dec −1 .