期刊
APPLIED SURFACE SCIENCE
卷 573, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151561
关键词
Hybrid supercapacitors; Mn-dopedNiCo(2)S(4); Double-shelled hollow nanowire arrays; High-reactivity
类别
资金
- National Natural Science Foundation of China [21905148]
- China Postdoctoral Science Foundation [2019T120567, 2017M612184]
- 1000-talents plan
- World-class discipline program
- Taishan scholars advantageous and distinctive discipline program of Shandong province
The synthesis of double-shelled Mn-doped NiCo2S4 hollow nanowire arrays improves the reactivity of hybrid supercapacitors, achieving high specific capacity and excellent rate performance.
Double-shelled Mn-doped NiCo2S4 (NiCoMn-S-h) hollow nanowire arrays are synthesized for optimized reactivity of hybrid supercapacitors. The NiCoMn-S-h is converted based on anion exchange reaction, which maintains the overall array structure of precursor and forms a double-shelled hollow structure. It is found that Mn composition lowers outer diffusion rate of precursor for the formation of inner shell of double-shelled structure. The specific structure and Mn-doping promote the performance of sulfides. As a result, the NiCoMn-S-h shows high specific capacity, improved rate performance and low charge transfer resistance as the battery electrode for hybrid supercapacitors. The NiCoMn-S-h exhibits a specific capacity of 948 C g-1 at 1 A g-1 combined with a highly retained specific capacity of 614 C g- 1 at 50 A g-1. The NiCoMn-S-h displays well matched performance with the capacitive electrode in hybrid supercapacitors, which exhibits both high-energy and high-power performances with specific energy of 44.9 Wh kg-1 at 780 W kg-1 and 19.2 Wh kg-1 at 23.4 kW kg-1 delivered.
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