A laser synthesis of vanadium oxide bonded graphene for high-rate supercapacitors  

作　　者：Jun Tang Linfei Zhang Xiongwei Zhong Xinghui Wang Feng Pan Baomin Xu 

机构地区：[1]School of Advanced Materials,Peking University Shenzhen Graduate School,Peking University,Shenzhen 518055,Guangdong,China [2]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,Guangdong,China [3]Institute of Micro/Nano Devices and Solar Cells,School of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,Fujian,China

出　　处：《Journal of Energy Chemistry》2020年第10期174-178,共5页能源化学（英文版）

基　　金：supported by the Fundamental Research(Discipline Arrangement)Project funding from Shenzhen Science and Technology Innovation Committee(Grant no.JCYJ20170412154554048);the Peacock Team Project funding from Shenzhen Science and Technology Innovation Committee(Grant no.KQTD2015033110182370);the National Key Research and Development Project funding from the Ministry of Science and Technology of China(Grants nos.2016YFA0202400 and 2016YFA0202404);the Shenzhen Maker Project for Students(Grant no.GRCK2017042410565958);the Guangdong Innovation Team Project(no.2013N080);the Shenzhen Peacock Plan(Grant no.KYPT20141016105435850)。

摘　　要：Graphene is a type of promising electrode material for high-energy and high-power density supercapacitors,but its electrochemical performance is greatly limited by the restacking problem.In this work,we reported a facile approach to synthesis graphene with chemically bonded vanadium oxide(VOx)nanoparticles and demonstrated that chemically-bonded VOxnanoparticles can effectively prevent the graphene sheets from restacking and hence improve the electrochemical performance.The capacitance of VOxbonded graphene increases to 272 F/g compared to 183 F/g of pristine graphene in 1 M H3PO4 aqueous electrolyte at 2 A/g.The VOx-bonded graphene also showed improved rate capability in both H3PO4 and ionic liquid electrolytes.The capacitance retention increases to 54.5%from 28.5%at 100 A/g(compare to2 A/g)in H3PO4 and increases to 65.1%from 46.3%at 2 A/g(compare to 0.2 A/g)in neat ionic liquid.A high energy density of 84.4 Wh/kg is obtained within the voltage window of 4 V in ionic liquid.Even at a high-power density of 1000 W/kg,the VOx-bonded graphene shows a high energy density of 47.3 Wh/kg.

关 键 词：SUPERCAPACITORS Restacking Vanadium oxides Laser reduced graphene 

分 类 号：TM53[电气工程—电器] TQ127.11[化学工程—无机化工]