期刊
JOURNAL OF POWER SOURCES
卷 449, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227507
关键词
Pseudocapacitance; delta-MnO2; Nanosheet; Oxygen vacancy; Hydrothermal reaction
资金
- Natural Science Foundation of China [21872174, U1932148]
- Project of Innovation-Driven Plan in Central South University [20180018050001]
- State Key Laboratory of Powder Metallurgy, International Science and Technology Cooperation Programme [2017YFE0127800]
- Hunan Provincial Science and Technology Program [2017XK2026]
- Shenzhen Science and Technology Innovation Project [JCYJ20180307151313532]
- National Postdoctoral Program for Innovative Talents of China
- Postdoctoral Science Foundation of China [2018M640759]
- Thousand Youth Talents Plan of China
- Hundred Youth Talents Program of Hunan
Coupling electrode composed of carbonaceous materials and metal oxides can effectively raise pseudocapacitance; however, due to the weak interaction between carbonaceous materials and metal oxides, structural control of the resultant coupling electrode remains a great challenge. Herein, surface-modified carbon cloth (SMCC), which is obtained by carbonizing the hydrothermal products of cetyltrimethylammonium bromide and glucose solution on carbon cloth (CC), is employed to regulate in-situ growth of delta-MnO2 in a KMnO4 and H2SO4 solution at hydrothermal condition. Structural characterizations indicate that surface modification renders SMCC to possess an oxygen-species-rich superhydrophilic surface, which in turn enables the supported delta-MnO2 to form the dense ultrathin nanosheets and abundant oxygen-vacancy (Vo) structure. Electrochemical tests demonstrate that the MnO2/SMCC can exhibit a specific capacitance of 508 F g(-1) (792.5 C g(-1)) at 1 A g(-1) under working potential range from -0.3 to 1.26 V-Ag/(AgCl) in three-electrode system, outperforming previously-reported delta-MnO2-based materials. Further, the detailed structural investigations identify that the oxygen species on SMCC dominate the generation of Vo in delta-MnO2 by reducing thickness and interface bonding, and the Vo in delta-MnO2 improves the pesudocapacitance by promoting the transition of Mn2+ to Mn4+.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据