Cobalt Covalent Doping in MoS2 to Induce Bifunctionality of Overall Water Splitting |
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| Authors: | Qizhong Xiong Yun Wang Peng‐Fei Liu Li‐Rong Zheng Guozhong Wang Hua‐Gui Yang Po‐Keung Wong Haimin Zhang Huijun Zhao |
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| Affiliation: | 1. Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, China;2. University of Science and Technology of China, Hefei, China;3. Centre for Clean Environment and Energy, Griffith University, QLD, Australia;4. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, China;5. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China;6. School of Life Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China |
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| Abstract: | The layer‐structured MoS2 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 MoS2 for efficient overall water splitting is reported. The results demonstrate that covalently doping cobalt into MoS2 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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| Keywords: | bifunctional electrocatalysts cobalt covalent doping MoS2 overall water splitting vapor‐phase hydrothermal method |
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