The Mo as electron trapper and donor to modulate the electron of CoP2 in phosphating process |
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| Affiliation: | 1. Department of Chemistry, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China;2. College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin 150040, China;1. School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an 710049, China;2. China Special Equipment Inspection and Research Institute, Beijing 100029, China;3. Central Research Institute of China Chemical Science and Technology, Beijing 100083, China;1. National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China;2. Aviation Engineering Institute, Jiangsu Aviation Technical College, 212134, China;3. Institute of Fluid Engineering Equipment Technology, Jiangsu University, Zhenjiang 212009, China;4. Wenling Fluid Machinery Technology Institute of Jiangsu University, Wenling 317525, China;1. Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials, Xiamen University, Xiamen 361005, PR China;2. Xiamen Key Laboratory of High Performance Metals and Materials, Xiamen University, Xiamen 361005, PR China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Shenzhen 518055, PR China;4. Institute of Materials Genome and Big Data, Harbin Institute of Technology, Shenzhen 518055, PR China;5. Shenzhen R&D Center for Al-based Hydrogen Hydrolysis Materials, Shenzhen 518055, PR China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;2. Hubei Engineering Technology Research Center of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China |
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| Abstract: | To prepare bifunctional electrocatalyst towards HER and OER is extremely important for promoting the development of electrochemical water splitting technology. Herein, the element doping method is employed to tune the electron environment of cobalt phosphide (CoP). The Mo-doped CoP supported on carbon cloth (CC) is constructed by solvothermal and annealing method. The effect of Mo on the electron modulation of CoP during different phosphating time was studied carefully. It is noted that the Mo play an important role in tuning the electron state of Co and P elements which can trap the electron and was reduced to low valence, then transfer the electron to Co and P. With increasing the phosphating time, the electron transfer phenomenon between Mo and CoP is obvious. Benefiting from the electron engineering of Mo, Co and P as well as thin and wrinkle sheets structure, the optimal electrocatalyst only requires 39 mV and 251 mV to deliver 10 mA cm−2 for HER and OER, respectively. Also, as for the whole water splitting performance, it delivers 10 mA cm−2 at cell voltage of 1.56 V. Importantly, Faraday efficiency of the optimal catalyst achieves 99.9% for HER due to the tuned electron state of Co and P, high ECSA and low Rct. |
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| Keywords: | Mo-doping Cobalt phosphide Nanosheets Co-MOF |
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