期刊
ENERGY
卷 227, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.120419
关键词
Supercapacitors; Flexible; Carbon nanocone; Hierarchical 3D structure; MoS2 nanosheets
资金
- National Key Research and Development Program of China [2019YFE0198000]
- China Postdoctoral Science Foundation [2019M662955]
- Science and Technology Program of Guangzhou [2019050001]
- Scientific and Technological Plan of Guangdong Province [2018A050506078]
- Department of Education of Guangdong Province [2019KZDXM014]
- Natural Science Foundation of China [21965027]
- Guangdong Provincial Natural Science Foundation [2016A030306033]
- SCNU Outstanding Young Scholar Project [8S0256]
- Research Network NANOTEC program of the National Nanotechnology Center of Thailand
- Pearl River Talent Program [2019QN01L951]
By uniformly depositing metallic molybdenum disulfide nanosheets on the surface of carbon nanocones grown on carbon cloths, a hierarchical 3D electrode structure with excellent electron transfer and ion diffusion properties is achieved, enabling the assembled supercapacitor to exhibit high energy density, high power density, and ultra-high cycling stability over 10,000 cycles, making it suitable for wearable electronics.
The ever-increasing demand for powering wearable electronics, energy concern, and climate crisis, arouse attention for developing energy storage systems with high energy and power density, long cycling life, and excellent mechanical flexibility. Herein, we demonstrate a hierarchical 3D electrode for high-performance flexible supercapacitors, in which metallic molybdenum disulfide (MoS2) nanosheets are uniformly deposited on the surface of carbon nanocones (CNC) grown on carbon cloths (CC), yielding CC-CNC@MoS2. The 3D CC-CNC substrate provides a large surface for high mass loading of MoS2, a high pathway for fast electron transfers as well as the porous structure for efficient electrolyte ion diffusion to access active materials. Also, the layered structure of metallic MoS2 nanosheets enables large amounts of active sites and facilitates ion transport as well. Benefitting from the rational nanostructure design, the assembled quasi-solid-state supercapacitor yielded a maximum energy density of 0.016 mWh cm(-2) and a peak power density of 8.3 mW cm(-2), and ultra-high cycling stability over 10,000 cycles, outperforming many recently reported flexible supercapacitors. Furthermore, the excellent mechanical properties of both CC-CNC substrates and MoS2 nanosheets endow the resulting quasi-solid-state supercapacitors with compelling flexibility for wearable electronics. Finally, an energy storage unit fabricated from the supercapacitors could light an LED, demonstrating its great application potential in wearable electronics. (C) 2021 Elsevier Ltd. All rights reserved.
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