Facile synthesis of free-standing nickel chalcogenide electrodes for overall water splitting |
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| Institution: | 1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3. School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;4. Institute of Advanced Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China |
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| Abstract: | Developing high-performance noble metal-free and free-standing catalytic electrodes are crucial for overall water splitting. Here, nickel sulfide(Ni_3S_2) and nickel selenide(Ni Se) are synthesized on nickel foam(NF) with a one-pot solvothermal method and directly used as free-standing electrodes for efficiently catalyzing hydrogen evolution reaction(HER) and oxygen evolution reaction(OER) in alkaline solution.In virtue of abundant active sites, the Ni_3S_2/NF and the NiS e/NF electrodes can deliver a current density of 10 m A cm~(-2) at only 123 m V, 137 m V for HER and 222 m V, 271 m V for OER. Both of the hierarchical Ni_3S_2/NF and Ni Se/NF electrodes can serve as anodes and cathodes in electrocatalytic overall watersplitting and can achieve a current density of 10 m A cm~(-2) with an applied voltage of ~1.59 V and 1.69 V,respectively. The performance of as-obtained Ni_3S_2/NF||Ni_3S_2/NF is even close to that of the noble metalbased Pt/C/NF||IrO_2/NF system. |
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