Depeng Zhao1, Meizhen Dai1, Hengqi Liu1, Kunfeng Chen2, Xiaofei Zhu1, Dongfeng Xue2, Xiang Wu1, Jinping Liu3
1School of Materials Science and Engineering, Shenyang University of technology, Shenyang 110870, P.R. China
2State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Science Changchun 130022 P. R. China
3School of Chemistry, Chemical Engineering and Life Science and State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 P. R. China
Tóm tắt
AbstractTo rationally design hybrid structures with unique surface/interface features is very significant due to their multi‐functionalization in energy storage and conversion systems. Generally, single metal oxide as electrode material is still unsatisfactory for its slow electron transportation and inevitable structural collapse. To address these issues, sulfur element‐induced interface‐tailoring hybrid NiCo2O4@NiMo2S4 nanosheet structures with high electrochemical activity are reported through a simple vulcanization process of NiCo2O4@NiMoO4 nanosheets. The hybrid NiCo2O4@NiMo2S4 structure presents excellent hydrogen evolution reaction performance with the overpotential of 159 mV at 10 mA cm−2 and low Tafel slope of 53.1 mV dec−1, and overall water splitting abilities with low cell voltage of 1.63 V at 50 mA cm−2 and stability for 13 h. As supercapacitor electrode materials, the hybrid structures exhibit a specific capacitance 519 C g−1 at 1 A g−1, which is higher than that of hybrid NiCo2O4@NiMoO4 nanosheets (420 C g−1). The asymmetric device delivers an energy density of 30.73 Wh kg−1 at a power density of 374.9 W kg−1.
