Facile one-pot synthesis of binder-free nano/micro structured dendritic cobalt activated nickel sulfide: a highly efficient electrocatalyst for oxygen evolution reaction |
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| Affiliation: | 1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;2. School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi''an 710119, Shaanxi, China;3. School of Chemical Engineering, The University of Adelaide, Adelaide, Australia;4. AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Yoshida, Sakyo-ku, Kyoto 606-8501, Japan;1. Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, PR China;2. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518055, PR China;3. Hong Kong Branch of National Precious Metals Material Engineering Research Centre, City University of Hong Kong, Hong Kong, China;4. Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong, China |
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| Abstract: | Reasonable design and preparation of non-noble metal electrocatalysts with predominant catalytic activity and long-term stability for oxygen evolution reaction (OER) are essential for electrocatalytic water splitting. Ni foam (NF) is highlighted for its 3D porous structure, impressive conductivity and large specific surface area. Herein, nano/micro structured dendritic cobalt activated nickel sulfide grown on 3D porous NF (Co–Ni3S2/NF) has been successfully synthesized by one-step hydrothermal method. Due to the ingenious incorporation of Co, Co–Ni3S2/NF electrode shows auspicious electrocatalytic performance for OER compared with Ni3S2/NF electrode. As a result, Co–Ni3S2/NF needs overpotential of only 274 and 459 mV at current density of 10 and 50 mA cm?2, respectively, while Ni3S2/NF requires overpotential of 344 and 511 mV. At potential of 2.0 V (vs. RHE), Co–Ni3S2/NF displays current density of 191 mA cm?2, while Ni3S2/NF just attains current density of only 135 mA cm?2. Moreover, Co–Ni3S2/NF demonstrates excellent stability for uninterrupted OER in alkaline electrolyte. The strategy of designing and preparing cobalt activated nickel sulfide grown on NF renders a magnificent prospect for the development of metal-sulfide-based oxygen evolution catalysts with excellent electrocatalytic performances. |
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| Keywords: | Water splitting Oxygen evolution reaction Electrocatalyst Ni foam |
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