液相-固相还原法克服团聚制备高性能超级电容器用石墨烯电极材料  

High-performance Graphene by Liquid-solid Reduction and its Application in Supercapacitors

作　　者：李选福[1,2] 周明[1] 田天[1] 秦禄昌[1,3] 

机构地区：[1]中国科学院宁波材料技术与工程研究所,浙江宁波315201 [2]宁波大学材料科学与化学工程学院,浙江宁波315211 [3]北卡罗来纳大学教堂山分校,usanc275993255

出　　处：《宁波大学学报（理工版）》2013年第4期56-60,共5页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：国家重点基础研究发展计划(2009CB930801);国家自然科学基金(21003145;11204325);浙江省自然科学基金(D4080489);浙江省科技创新团队项目(2009R50010);宁波市创新团队项目(2009B21005)

摘　　要：以水合肼为还原剂采用液相预还原-冷冻干燥-固相充分还原的方法制备的石墨烯电极材料具有十分优越的电化学性能,在超级电容器中比电容值达到336F·g-1(10 mV·s-1,循环伏安法),较液相还原石墨烯(270F·g-1)提高24%,同时亦优于固相还原石墨烯(323 F·g-1).对液相预还原氧化石墨烯采取冷冻干燥,既避免了液相直接还原干燥过程中的团聚现象,同时也有效地增加了固相还原石墨烯的无序度,从而进一步提高了石墨烯的电化学性能.Using the oxidation-reduction method,the high-performance graphene is prepared from graphite utilizing the liquid-solid reduction in which agglomeration is effectively avoided.Its specific capacitance（SC） in supercapacitors reaches 336 F·g-1（measured by cyclic voltammetry at 10 mv·s-1） in comparison with the SC of liquid reacted graphene and solid reacted graphene being 270 F·g-1and 316 F·g-1,respectively.The functional groups in partially reduced graphene oxide reduces the agglomeration of the graphene sheets.As a result,the diffusion of electrolyte ions between graphene sheets is improved and eventually led to improved electrochemical performance when used in supercapacitors.

关 键 词：液相-固相还原 石墨烯团聚 超级电容器 氧化还原法 高比电容 

分 类 号：O64[理学—物理化学]