摘要
The design of supercapacitor materials with both high areal capacity(C)and high mass loading is vitally important for enhancing energy density(E).Herein,we prepared a NiCosingle bondOH/NiCoOOH composite film consisting of NiCosingle bondOH/NiCoOOH nanosheets on an expanded graphite paper(EGP)by using a facial anodization method.The as-prepared NiCosingle bondOH/NiCoOOH film exhibits ultra-high C of 11 mA·h·cm^(-2)at a mass loading of 165 mg·cm^(-2),high rate capability of 71%and excellent cycling stability of 95%after 12000 cycles.The outstanding performance is ascribed to the low-crystalline feature of the NiCosingle bondOH/NiCoOOH nanosheets,and the synergistic effect of the NiCosingle bondOH and NiCoOOH phases and high conductive porous EGP.An aqueous asymmetric supercapacitor,assembled with the NiCosingle bondOH/NiCoOOH on EGP and Fe_(2)O_(3)on EGP as positive-and negative-electrode,respectively,shows a highest E of 3.8 mW·h·cm^(-2)at a power density(P)of 4 mW·cm^(-2)and a maximum P of 107 mW·cm^(-2)at an E of 2.7 mW·h·cm^(-2).
基金
This work was supported by the National Natural Science Foundation of China(Nos.51972234,92163118).
作者简介
Mingyuan Gao received his B.S.degree from Shandong Vocational College of Industry,China in 2011 and master's degree(under Prof.Qibo Zhang)in the Faculty of Metallurgical and Energy Engineering,KMUST,P.R.China in 2015.He is now a PhD student in the School of Materials Science&Engineering at Tongji University under the supervision of Prof.Kefeng Cai.His research interests focus on electrochemical fabrication of nickel-based nanomater i a l s f o r e l e c t ro c h e m ic a l w a t e r s p l i t t i n g a n d supercapacitor;Corresponding author:Kefeng Cai currently holds position as professor in the School of Materials Science&Engineering at Tongji University,China.Previously he was a senior visiting scholar at CSIRO,Australia,an AvH Research Fellow at German Aerospace Center,a postdoc at University of the Witwatersrand,an associate professor at Wuhan University of Technology(WUT).He obtained his Ph.D.at WUT in 1998.He is interested in flexible electronics(thermoelectric and supercapacitive).Currently he is a member of International thermoelectric society.He has published more than 150 journal papers,four reviews and 20 granted patent.E-mail address:kfcai@tongji.edu.cn。
