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Cobalt Covalent Doping in MoS 2 to Induce Bifunctionality of Overall Water Splitting
Author(s) -
Xiong Qizhong,
Wang Yun,
Liu PengFei,
Zheng LiRong,
Wang Guozhong,
Yang HuaGui,
Wong PoKeung,
Zhang Haimin,
Zhao Huijun
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201801450
Subject(s) - cobalt , oxygen evolution , electrocatalyst , water splitting , materials science , catalysis , doping , covalent bond , transition metal , reversible hydrogen electrode , hydrogen , inorganic chemistry , chemical engineering , nanotechnology , electrode , chemistry , electrochemistry , optoelectronics , working electrode , metallurgy , organic chemistry , photocatalysis , engineering
The layer‐structured MoS 2 is a typical hydrogen evolution reaction (HER) electrocatalyst but it possesses poor activity for the oxygen evolution reaction (OER). In this work, a cobalt covalent doping approach capable of inducing HER and OER bifunctionality into MoS 2 for efficient overall water splitting is reported. The results demonstrate that covalently doping cobalt into MoS 2 can lead to dramatically enhanced HER activity while simultaneously inducing remarkable OER activity. The catalyst with optimal cobalt doping density can readily achieve HER and OER onset potentials of −0.02 and 1.45 V (vs reversible hydrogen electrode (RHE)) in 1.0 m KOH. Importantly, it can deliver high current densities of 10, 100, and 200 mA cm −2 at low HER and OER overpotentials of 48, 132, 165 mV and 260, 350, 390 mV, respectively. The reported catalyst activation approach can be adapted for bifunctionalization of other transition metal dichalcogenides.
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