期刊
APPLIED SURFACE SCIENCE
卷 542, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148564
关键词
Hierarchical structure; Kirkendall effect; Solid-state supercapacitors; Capacity; Ragone plot
类别
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) of the Republic of Korea [20184030202210]
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20184030202210]
- Ministry of Education of the Republic of Korea through Chungbuk National University
By employing a simple two-step strategy, 3D-networked and mesoporous Zn-Ni-Co-S nanowire-like arrays were successfully grown as a free-standing electrode for supercapacitors, demonstrating superb capacity, rate capability, and cycle life. Furthermore, a solid-state asymmetric supercapacitor device based on Zn-Ni-Co-S NWAs achieved excellent energy density and cyclic performance.
The rational design and subsequent growth of apposite nanostructured transition metal sulfide on conductive scaffold with auspicious morphology to produce an advanced electrode material for supercapacitors is highly desirable to boost the electrochemical performance. Herein, a simplistic two-step strategy is designed to grow 3D-networked and mesoporous Zn-Ni-Co-S nanowire-like arrays (NWAs) on a Ni-foam scaffold, which includes the hydrothermal growth of Zn-Ni-Co-based hydroxyl precursor, followed by an effective sulfidation process. When employed as a free-standing electrode for supercapacitors, Zn-Ni-Co-S NWAs electrode delivers a superb capacity of 418.2 mA h g(-1) at 4.6 mA cm(-2), good rate capability (233.3 mA h g(-1) at 50 mA cm(-2)), and long cycle life (similar to 89% of capacity retained after 10,000 cycles). Furthermore, a solid-state asymmetric supercapacitor device was constructed based on Zn-Ni-Co-S NWAs as cathode and graphitic carbon nitride/graphene as anode materials, achieves a cell capacity of 110.7 mA h g(-1) at 5 mA cm(-2), superior capacity retention (54% at 75 mA cm(-2)) and superb cyclic performance (93% after 10,000 cycles). The device delivers a superb energy density of 88.6 W h kg(-1) at a power density of 419.4 W kg(-1), and upholds an energy density of 47.6 W h kg(-1) at a high power density of 7048.4 W kg(-1).
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