期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 8, 页码 5835-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00981
关键词
corncob-derived carbon; hierarchical porous structure; energy density; zinc; aqueous hybrid supercapacitors
资金
- National Natural Science Foundation of China [51772147, U1601214, 51502137, 11704317, 51425301]
- National Materials Genome Project [2016YFB0700600]
- Jiangsu Distinguished Professorship Program
- Postgraduate Research amp
- Practice Innovatidn Program of Jiangsu Province [KYCX18_1128]
- Research Foundation of State Key Lab [ZK201805]
Low-cost supercapacitors with high energy densities have attracted great research attention, since it would broaden the application of capacitors. Increasing the capacitance is one principle to obtain a high energy density of a supercapacitor. In this study, a low cost aqueous Zn-based hybrid supercapacitor (AZHS) with high energy density is achieved using an actived carbon derived from corncob (denoted as ACC) as the positive electrode, zinc metal as the negative electrode, and the 2 M ZnSO4 electrolyte. The actived carbon is prepared with a facile calcination-activation process, and it exhibits high specific surface area (2619 m(2) g(-1)). Though without extra heteroatom doping, ACC demonstrates a superb specific capacitance in acidic, alkaline and neutral electrolytes. The assembled AZHS exhibits a high energy density of 94 W h kg(-1) at 68 W kg(-1) in a potential window of 0.2-1.8 V, and an excellent cycle stability with only 1.8% capacitance decay is obtained after 10 000 cycles at 5 A g(-1). These results suggest that a low cost supercapacitor with high energy density can be achieved by a hybrid system design using electrodes with high capacitance.
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