A Low-Cost Zn-Based Aqueous Supercapacitor with High Energy Density

被引：116

作者：

He, Liang ^{[1
,2
]}

Liu, Yu ^{[1
,2
]}

Li, Chunyang ^{[1
,2
]}

Yang, Dezhi ^{[1
,2
]}

Wang, Weigang ^{[1
,2
]}

Yan, Wenqi ^{[1
,2
]}

Zhou, Weibin ^{[1
,2
]}

Wu, Zhixian ^{[1
,2
]}

Wang, Lili ^{[1
,2
]}

Huang, Qinghong ^{[1
,2
]}

Zhu, Yusong ^{[1
,2
]}

Chen, Yuhui ^{[1
,2
]}

Fu, Lijun ^{[1
,2
,3
]}

Hou, Xianhua ^{[3
]}

Wu, Yuping ^{[1
,2
,3
]}

机构：

[1] Nanjing Tech Univ, State Key Lab Mat Oriented Chem Engn, Coll Energy Sci & Engn, 30 Puzhu Rd S, Nanjing 211800, Jiangsu, Peoples R China

[2] Nanjing Tech Univ, Inst Adv Mat, 30 Puzhu Rd S, Nanjing 211800, Jiangsu, Peoples R China

[3] South China Normal Univ, 55 West Zhongshan Rd, Guangzhou 510631, Guangdong, Peoples R China

来源：

ACS APPLIED ENERGY MATERIALS | 2019年 / 2卷 / 08期

基金：

中国国家自然科学基金;

关键词：

corncob-derived carbon; hierarchical porous structure; energy density; zinc; aqueous hybrid supercapacitors; HIGH-PERFORMANCE SUPERCAPACITORS; HIERARCHICAL POROUS CARBON; CAPACITY BATTERY ANODES; FUNCTIONALIZED GRAPHENE; ELECTRODE MATERIALS; SURFACE-AREA; STORAGE; NITROGEN; HYDROGEN; CONVERSION;

D O I：

10.1021/acsaem.9b00981

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：5835 / +

页数：15

共 64 条

[1] Nitrogen-doped activated carbons derived from a co-polymer for high supercapacitor performance [J].