期刊
CHEMICAL ENGINEERING JOURNAL
卷 336, 期 -, 页码 679-689出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.12.035
关键词
ZnCo2O4 thin sheets; Two dimensional materials; Porous materials; Asymmetric supercapacitors; Electrochemical energy storage
资金
- National Natural Science Foundation of China [21101176, 21676036]
- Fundamental Research Funds for the Central Universities (Chongqing University, China) [CQDXWL-2012-037]
- Large-scale Equipment Sharing Fund of Chongqing University
As a promising electrode material for supercapacitor, two dimensional (2D) porous cobaltite with spinel structure shows high specific capacitance, long cycle life and especially high energy density, which have great potential in electrochemical energy storage. In the present work, we demonstrated for the first synthesis of 2D porous ZnCo2O4 thin sheets (CQU-Chen-Zn-Co-O-2) with micro-mesoporous structure and high specific surface area of 89.63, 151.65 and 63.72 m(2).g(-1) through simple hydrothermal treatment of a mixed aqueous solution containing two kinds of transition metal nitrates (zinc nitrate (Zn(NO3)(2)) and cobalt nitrate (Co(NO3)(2))) and benzoic acid (C6H5COOH, BA) at 180, 200 and 220 degrees C for 12 h. The 3D nanoflake array assembled nanostructures of the ZnCo2O4 thin sheets facilitate the transmission of ions and electrons throughout the electrochemical testing process, which yield a higher specific capacitance of 3.07 F.cm(-2) at 1.04 mA.cm(-2) in a three-electrode system and a high energy density of 36.31 Wh.kg(-1) at a power density of 850 W.kg(-1) in an aqueous asymmetric supercapacitor (ZnCo2O4 thin sheets//active carbon (AC)). The results indicate that the 2D ZnCo2O4 thin sheets exhibt superior supercapacitor performance.
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