三维多孔石墨烯电极的构建及其电容性能  

The construction and capacitance performance of three-dimensional porous graphene electrode

作　　者：方朝合[1] 胡博 葛稚新[1] 苗盛[1] 霍玉秋[2] 张茜 FANG Chao-he;HU Bo;GE Zhi-xin;MIAO Sheng;HUO Yu-qiu;ZHANG Qian(Research Institute of Petroleum Exploration and Development-Langfang,Langfang 065007,China;Department of Chemistry,School of Science,Northeastern University,Shenyang 110819,China)

机构地区：[1]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [2]东北大学理学院化学系,辽宁沈阳110819

出　　处：《分子科学学报》2019年第5期388-394,共7页Journal of Molecular Science

基　　金：国家自然科学基金资助项目(51574062)

摘　　要：利用循环伏安法将氧化石墨烯部分还原并沉积在泡沫镍基底上,然后利用恒电位法进行深度电化学还原,形成具有三维多孔结构的石墨烯电极.探讨甘氨酸/盐酸(GBS)和磷酸二氢钠/磷酸氢二钠(PBS)2种不同缓冲溶液在深度还原石墨烯过程中的作用.对于石墨烯电极的电容性能而言,GBS体系优于PBS体系.在pH=4.4的GBS体系中单电极比电容达488.9F·g^-1,比酸性PBS体系还原后的电容值318.7F·g^-1提高153.4%,比碱性PBS体系还原后的电容值156.1F·g^-1提高313.2%.并且循环3 000圈后比电容仍然保持原来的90.3%.这是由于质子在氧化石墨烯的还原过程中起到了关键的作用.在电场作用下,甘氨酸比磷酸更易提供质子,因而甘氨酸比磷酸更易于促进氧化石墨烯还原反应的进行.In this paper,the 3Dporous graphene electrodes were obtained by two-step electrochemical reduction method.First,the graphene oxide was deposited to foam nickel substrate with cyclic voltammetry method,then the galvanostatic charge-discharge was used to further reduce.The effects of glycine/hydrochloric acid buffer solution(GBS)and sodium dihydrogen phosphate/disodium hydrogen phosphate buffer solution(PBS)on reduction were discussed.Results show that the GBS system is better than the PBS system.The specific capacitance of the electrode reduced in the GBS(pH=4.4)system is 488.9F·g^-1,which increased 153.4%than that in acidic PBS system,and 313.2%than alkaline PBS system.After 3 000cycles of charging and discharging,the specific capacitance remains 90.3%.This is because the proton has played a key role in the reduction process of graphene oxide.Under the effect of electric field,the glycine is more likely to provide the proton than the phosphoric acid.Thus the glycine is easier to promote graphene oxide reduction reaction than the phosphate.

关 键 词：石墨烯 三维 多孔 缓冲溶液 电容性能 

分 类 号：O646[理学—物理化学]