One-step synthesis of carbon-encapsulated nickel phosphide nanoparticles with efficient bifunctional catalysis on oxygen evolution and reduction |
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| Authors: | Da Huo Fangfang Song Jianguo Hu Junhua Yuan Li Niu Ai-jun Wang |
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| Affiliation: | 1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Life Sciences and Chemistry, Zhejiang Normal University, Jinhua, Zhejiang, 321004, China;2. Department of Scientific Research Management, Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi, 330004, China;3. School of Pharmacy, Hubei University of Science and Technology, Xianning, Hubei, 437100, China;4. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China |
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| Abstract: | As a promising and cost-efficient alternative to noble metal catalysts, transition metal phosphides (TMPs) show highly catalytic performance toward oxygen reduction and evolution reactions (ORR and OER). Mesoporous carbon-coated nickel phosphide (NiP) nanoparticles were successfully synthesized by thermal decomposition at 500 °C under N2/H2 (95:5) atmosphere. The NiP/C hybrid exhibits excellent OER/ORR activity. It can generate an OER current density of 10 mA cm?2 at the overpotential of 0.26 V with a low Tafel slope of 43 mV dec?1, and produce a limited ORR current density of 5.10 mA cm?2 at 1600 rpm with a half-wave potential of 0.82 V via a 4-electron pathway. In addition, the OER/ORR catalytic currents remain considerable stable without significant loss for more than 25 h polarization. This work will open up a new avenue to design a bifunctional catalyst with a superior OER/ORR activity and stability, and this cost-efficient strategy will pave the way for the industrial application of the renewable energy technologies. |
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| Keywords: | Transition metal phosphides Electrocatalysis Oxygen evolution reaction Oxygen reduction reaction |
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