Enhanced alkaline water splitting on cobalt phosphide sites by 4d metal (Rh)-doping method |
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| Affiliation: | 1. Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea;2. Research Center for Innovative Energy and Carbon Optimized Synthesis for Chemicals (Inn-ECOSysChem), Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea;1. Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang, 621907, Sichuan, China;2. Institute of Materials, China Academy of Engineering Physics, Mianyang, 621900, Sichuan, China;1. School of Electrical Engineering, North China University of Water Resources and Electric Power; Zhengzhou, Henan 450045, China;2. Electrical Engineering Department, Arian Company, Yerevan, Armenia;1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212000, Jiangsu, China;2. Institute of Technology Center, Jiujiang Pinggang Iron and Steel of Fangda Group Co. Ltd, Jiujiang, 332599, China;3. College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China;4. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua, 617000, China;1. College of Materials Science and Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, PR China;2. Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 211816, PR China;3. Department of Materials Science, Fudan University, Shanghai, 200433, PR China |
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| Abstract: | The construction of effective water-splitting electrocatalysts in alkaline conditions is challenging due to lower water dissociation efficiency than in acidic conditions. In this study, we investigated the effect of doping 4d and 5d metals into the 3d metal active site of cobalt phosphide (CoxP) on the water-splitting reaction. Introducing Ru slightly improved hydrogen evolution efficiency, but Rh doping significantly enhanced the catalytic parameters with an overpotential of 0.03 V at 10 mA/cm2. Rh regulated the electronic structure of CoxP to improve proton reduction. The Rh-CoxP electrode showed a comparable catalytic efficiency to that of a Pt/C standard. Ir doping slightly improved catalytic reactivity, but not as much as Rh. Our results showed that doping 4d metal from the same group as Co maximizes the doping effect during hydrogen evolution. A lab-scale water electrolyzer built with Rh-CoxP successfully demonstrated catalytic water splitting in alkaline electrolyte. |
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| Keywords: | Cobalt phosphide Rhodium doping Alkaline water-splitting |
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