Preparation of ultrathin molybdenum disulfide dispersed on graphene via cobalt doping: A bifunctional catalyst for hydrogen and oxygen evolution reaction |
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| Affiliation: | 1. State Key Laboratory of Heavy Oil and Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum, Beijing, 102249, PR China;2. Lab of Advanced Nano Structures & Transfer Processes, Department of Chemical Engineering, Tianjin University, Tianjin, 300354, PR China;1. Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China;2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;1. Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, and Laboratory for Quantum Engineering and Micro-Nano Energy Technology and School of Physics and Optoelectronics, Xiangtan University, Hunan 411105, PR China;2. Hunan Key Laboratory of Two-Dimensional Materials, Hunan University, Changsha 410082, China;1. Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA;2. Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA |
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| Abstract: | The development of highly active and low-cost catalysts for hydrogen evolution reaction (HER) is significant for the development of clean and renewable energy research. Owing to the low H adsorption free energy, molybdenum disulfide (MoS2) is regarded as a promising candidate for HER, but it shows low activity for oxygen evolution reaction (OER). Herein, graphene-supported cobalt-doped ultrathin molybdenum disulfide (Co–MoS2/rGO) was synthesized via a one-pot hydrothermal method. The obtained hybrids modified electrode exhibits a high HER catalytic activity with a low overpotential of 147 mV at the current density of 10 mA cm?2, a small Tafel slope of 49.5 mV dec?1, as well as good electrochemical stability in acidic electrolyte. Meanwhile, the catalyst shows remarkable OER activity with a low overpotential of 347 mV at 10 mA cm?2. The superior activity is ascribed not only to the high conductivity originated from the reduced graphene, but also to the synergistic effect between MoS2 and cobalt. |
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| Keywords: | Molybdenum disulfide Graphene Cobalt doping Hydrogen evolution reaction Oxygen evolution reaction |
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