Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 12, Pages 16562-16569Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.02.227
Keywords
Supercapacitors; NiCo2S4; Polypyrrole; Nanoneedles
Categories
Funding
- NSFC [51861004, 52071092]
- Guangxi Natural Science Foundation [2020GXNSFGA297004, 2019GXNSFDA245023, 2019GXNSFGA245005, 2020ZYZX1017]
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NiCo2S4 nanoneedles were successfully synthesized by a two-step hydrothermal method and further coated with a layer of PPy through in-situ polymerization to form NiCo2S4@PPy composite. The NiCo2S4@PPy electrodes exhibited high capacitance and excellent cycling stability, indicating great potential for energy storage electrode materials.
In this study, dicobalt tetrasulfide (NiCo2S4) nanoneedles were successfully synthesized by a two-step hydrothermal method on nickel foam. A layer of polypyrrole (PPy) was further wrapped on the surface of the NiCo2S4 nanoneedles by in-situ polymerization. The obtained NiCo2S4@PPy composite was investigated for supercapacitor applications, which exhibited a capacitance of 1842.8 F g(-1) at 1 A g(-1). An asymmetric supercapacitor device fabricated with an activated carbon negative electrode and NiCo2S4@PPy positive electrodes exhibited an energy density of 41.2 Wh kg(-1) at 402.2 W kg(-1) with a high charge-discharge cycling stability (92.8% after 5000 cycles). These results demonstrate that NiCo2S4@PPy electrodes have broad application prospects as energy storage electrode materials.
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