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石墨烯-碳量子点复合材料的电化学性能研究
作者姓名:彭泽泽  丁玲  周尽晖  李世迁  肖峰  周进
作者单位:武汉科技大学化学与化工学院,湖北 武汉,430081,武汉科技大学化学与化工学院,湖北 武汉,430081;武汉科技大学煤转化与新型炭材料湖北省重点实验室, 湖北 武汉,430081,武汉科技大学化学与化工学院,湖北 武汉,430081;武汉科技大学煤转化与新型炭材料湖北省重点实验室, 湖北 武汉,430081,福建师范大学福清分校近海流域环境测控治理福建省高校重点实验室,福建 福清,350300,武汉科技大学化学与化工学院,湖北 武汉,430081,武汉科技大学化学与化工学院,湖北 武汉,430081
基金项目:湖北省自然科学基金资助项目(2017CFB680);湖北省教育厅科学技术研究基金资助项目(B2016008);武汉科技大学省部共建耐火材料与冶金国家重点实验室开放基金资助项目(G201703);福建师范大学福清分校近海流域环境测控治理福建省高校重点实验室基金资助项目(S1-KF1604).
摘    要:采用Hummers法和水热法,制备石墨烯和碳量子点溶液作为前驱体,然后通过一步煅烧法制得石墨烯-碳量子点复合材料。借助SEM、UV-Vis、FTIR等手段,对样品的形貌和结构进行表征;利用循环伏安法(CV)、差分脉冲伏安法(DPV)及恒流充放电循环测试等,重点考察了样品的电化学性能。结果表明,在石墨烯表面负载碳量子点可增加材料的比表面积并改善其机械性能,由于活性位点的增加,所制石墨烯-碳量子点复合电极具有较好的可逆性及电化学活性;在检测不同浓度双氧水时,复合电极的灵敏度为纯石墨烯电极的1.4倍左右;石墨烯-碳量子点复合材料作为锂离子电池负极使用时,与纯石墨烯材料相比具有更好的循环稳定性,且容量保持率提高了1.67倍。

关 键 词:石墨烯  碳量子点  复合材料  负极材料  电化学性能  锂离子电池  循环稳定性
收稿时间:2017/10/10 0:00:00

Electrochemical performance of graphene/carbon quantum dots composites
Authors:Peng Zeze  Ding Ling  Zhou Jinhui  Li Shiqian  Xiao Feng and Zhou Jing
Institution:College of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China,College of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;Hubei Coal Conversion and New Carbon Materials Key Laboratory, Wuhan University of Science and Technology, Wuhan 430081, China,College of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;Hubei Coal Conversion and New Carbon Materials Key Laboratory, Wuhan University of Science and Technology, Wuhan 430081, China,Key Laboratory of Measurement and Control System for Offshore Environment, Fuqing Branch of Fujian Normal University, Fuqing 350300, China,College of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China and College of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Abstract:The Hummers method and hydrothermal method were adopted to prepare graphene and carbon quantum dots solution respectively as the precursors, and then graphene/carbon quantum dots composite was synthesized by a one-step calcination approach. The mophology and microstructure of the prepared samples were characterized by means of SEM, UV-Vis and FTIR, and the electrochemical properties were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and constant current charge-discharge cycle test. The results show that the carbon quantum dots on the graphene surface can increase the specific surface area of the composite material and improve its mechanical property. Due to the increase of active sites numbers, the prepared composite electrode exhibits good reversibility and electrochemical activity; the sensitivity of the composite electrode is about 1.4 times that of the pure graphene electrode when detecting the H2O2 soluition with different concentrations. Moreover, the graphene/carbon quantum dot composite has a better cycle stabilitity campared with the pure graphene material when used as the negative electrode of lithium ion battary, and the capacity retention rate register a 1.67 times increase.
Keywords:graphene  carbon quantum dot  composite  cathode material  electrochemical performance  lithium ion battery  cycle stability
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