We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Facile synthesis of mesoporous ZnCo<sub>2</sub>O<sub>4</sub> nanosheet arrays grown on rGO as binder-free electrode for high-performance asymmetric supercapacitor.
- Authors
Qi, Jiqiu; Mao, Jingwen; Zhang, Anbang; Jiang, Liyang; Sui, Yanwei; He, Yezeng; Meng, Qingkun; Wei, Fuxiang; Zhang, Xuping
- Abstract
Asymmetric supercapacitor (ASC) with high energy density has been developed successfully using rGO/ZnCo2O4 composite as positive electrode and activated porous carbon (AC) derived from lotus leaves as negative electrode in KOH solution. Mesoporous ZnCo2O4 nanosheet arrays grown on rGO were prepared via a simple hydrothermal method followed by calcination. RGO/ZnCo2O4 composite exhibited excellent electrochemical performance, which can achieve a specific capacity of 680 F g−1 at current density of 1 A g−1. Due to the high capacitance of porous rGO/ZnCo2O4 nanosheet structure and synergistic effect between the positive and negative electrodes, the RGO/ZnCo2O4//AC ASC showed excellent performance with high specific capacitance of 110 F g−1 at 0.5 A g−1 and good cycling stability with only 2.7% loss of available specific capacitance after 3000 cycles. More importantly, the maximum energy density of this ASC can achieve 31.25 W h kg−1 at a power density of 375 W kg−1. In addition, this ASC can store charge efficiently and two ASCs in series can light up a LED, which can last for over 15 min. These encouraging results show its great potential in the application of energy storage devices.
- Subjects
SUPERCAPACITORS; ELECTRODES; POWER capacitors; ELECTRICAL conductors; COMPOSITE materials
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 23, p16074
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-2757-7