High-efficiency Co6W6C catalyst with three-dimensional ginger-like morphology for promoting the hydrogen and oxygen evolution reactions |
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| Affiliation: | 1. Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, PR China;2. Chemistry Department, Nalikule College of Education, Lilongwe, Malawi;1. School of Chemistry and Environmental Engineering, Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Changchun University of Science and Technology, Chang Chun Weixing Road, Jilin, China;2. Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Chang Chun 130024, Jilin, China;1. Dongguan Neutron Science Center, Dongguan 523803, China;2. Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China;3. School of Environmental and Civil Engineering, Dongguan University of Technology, Guangdong 523808, PR China;1. Dongguan Neutron Science Center, Dongguan 523803, China;2. Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China |
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| Abstract: | Development of electrocatalysts composed of low cost and abundant elements that exhibit catalytic activity comparable to noble metals is important for water splitting. As such, in this study, a catalyst material with a ginger-like morphology consisting of Co6W6C is synthesized via a hydrothermal reaction and pyrolysis treatment. The Co6W6C catalyst exhibits satisfactory electrochemical properties towards both hydrogen and oxygen evolution reactions in an alkaline electrolyte, with a low overpotential, low Tafel slope, and durable stability. Co6W6C possesses a high activity for the hydrogen evolution reaction in alkaline conditions, with an onset potential and overpotential of −0.024 V and 101 mV, respectively, and low Tafel slope of 80.5 mV dec−1 at a current density of 10 mA cm−2. In addition, Co6W6C achieves a current density of 10 mA cm−2 for the oxygen evolution reaction at an overpotential of only 343 mV. Furthermore, electrochemical stability tests indicate that the Co6W6C catalyst maintains 91% of the original current after 60,000 s for the hydrogen evolution reaction and 95% of the original current after 45,000 s for the oxygen evolution reaction. Moreover, electrochemical splitting of water via a two-electrode system employing this catalyst can hold 89% of the initial current after 40,000 s in 1 M KOH. |
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| Keywords: | Water splitting Hydrogen evolution reaction Oxygen evolution reaction Noble-metal free electrocatalyst |
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