Hierarchical Cobalt Hydroxide and B/N Co-Doped Graphene Nanohybrids Derived from Metal-Organic Frameworks for High Energy Density Asymmetric Supercapacitors

被引：82

作者：

Tabassum, Hassina ^{[1
]}

Mahmood, Asif ^{[1
]}

Wang, Qingfei ^{[1
]}

Xia, Wei ^{[1
]}

Liang, Zibin ^{[1
]}

Qiu, Bin ^{[1
]}

Zhao, Ruo ^{[1
]}

Zou, Ruqiang ^{[1
]}

机构：

[1] Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing Key Lab Theory & Technol Adv Battery Mat, Beijing 100871, Peoples R China

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

基金：

中国国家自然科学基金;

关键词：

CATALYST-FREE SYNTHESIS; POROUS CARBON; NANOPOROUS CARBONS; FACILE SYNTHESIS; NANOWIRE ARRAYS; THIN-FILM; BORON; EFFICIENT; PERFORMANCE; NANOSHEETS;

D O I：

10.1038/srep43084

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

To cater for the demands of electrochemical energy storage system, the development of cost effective, durable and highly efficient electrode materials is desired. Here, a novel electrode material based on redox active beta-Co(OH)(2) and B, N co-doped graphene nanohybrid is presented for electrochemical supercapacitor by employing a facile metal-organic frameworks (MOFs) route through pyrolysis and hydrothermal treatment. The Co(OH)(2) could be firmly stabilized by dual protection of N-doped carbon polyhedron (CP) and B/N co-doped graphene (BCN) nanosheets. Interestingly, the porous carbon and BCN nanosheets greatly improve the charge storage, wettability, and redox activity of electrodes. Thus the hybrid delivers specific capacitance of 1263 F g(-1) at a current density of 1A g(-1) with 90% capacitance retention over 5000 cycles. Furthermore, the new aqueous asymmetric supercapacitor (ASC) was also designed by using Co(OH)(2)@CP@BCN nanohybrid and BCN nanosheets as positive and negative electrodes respectively, which leads to high energy density of 20.25 Whkg(-1). This device also exhibits excellent rate capability with energy density of 15.55 Whkg(-1) at power density of 9331 Wkg(-1) coupled long termed stability up to 6000 cycles.

引用

页数：12

共 66 条

[41] Dibromocarbene Functionalization of Boron Nitride Nanosheets: Toward Band Gap Manipulation and Nanocomposite Applications [J].