期刊
JOURNAL OF MATERIALS SCIENCE
卷 53, 期 24, 页码 16458-16465出版社
SPRINGER
DOI: 10.1007/s10853-018-2743-0
关键词
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资金
- National Natural Science Foundation of China [21463013]
- Jiangxi Provincial Department of Science and Technology [20171BAB203013]
- Jiangxi Provincial Education Department [GJJ160290]
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University [KLFS-KF-201716]
- National Materials Genome Project [2016YFB0700600]
- National Natural Science Foundation Committee of China [51573013]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [Kycx18_1122]
Chromium oxide has emerged as an attractive electrode material to construct high-performance supercapacitor. Despite some available reports on Cr2O3-based supercapacitors, the charge storage of Cr2O3 electrodes in alkaline electrolytes is far from being understood unlike those of other compounds of Ti, V, Mn, Fe, Co, Ni etc in periodic table of elements. Herein, the detail kinetics analyses of electrochemical behaviors of the electrode based on Cr2O3 nanoparticles in alkaline electrolyte were demonstrated in this work. We examine that there are both surface-controlled pseudocapacitance (with a contribution of 76%) and diffusion-limited redox reactions (with a contribution of 24%) for the charge storage in electrode based on Cr2O3 nanoparticles at a low sweep rate of 1mVs(-1). The identifying pseudocapacitive contribution dominates the charge storage in electrode based on Cr2O3 nanoparticles at high sweep rates, reaching up to 96% at 50mVs(-1). In addition, the assembled hybrid supercapacitor based on Cr2O3 nanoparticles as the positive electrode displays an operating voltage of 1.45V, an energy density of 14.7Whkg(-1), and high stability of 3000 cycles. This work will contribute to the development of pseudocapacitive electrode materials for supercapacitors.
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