水热法制备还原氧化石墨烯担载Ni(OH)_2纳米带复合材料及其电容特性  

Hydrothermal synthesis of Ni(OH)_2/RGO nanocomposites with superior electrochemical performance

作　　者：李倩[1,2] 吕春祥 陈成猛[1] 谢莉婧[1] 袁淑霞[3] LI Qian;LV Chun-xiang;CHEN Cheng-meng;XIE Li-jing;YUAN Shu-xia(Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;University of Chinese Academy of Sciences, Beijing 100049, China;National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China)

机构地区：[1]中国科学院山西煤炭化学研究所中国科学院炭材料重点实验室,山西太原030001 [2]中国科学院大学,北京100049 [3]中国科学院山西煤炭化学研究所碳纤维制备技术国家工程实验室,山西太原030001

出　　处：《新型炭材料》2017年第6期527-534,共8页New Carbon Materials

基　　金：国家自然科学基金(51174144);山西省科技攻关(201103210392)~~

摘　　要：以氧化石墨烯溶液和硝酸镍为原料,采用一步水热法制备了Ni(OH)_2/还原氧化石墨烯(Ni(OH)_2@RGO)复合材料。在Ni(OH)_2/还原氧化石墨烯的研究中,两组分间的配比对复合物的形貌和电化学活性具有显著的影响。在最佳配比下(RGO含量26.7%),Ni(OH)2以纳米带形式担载于石墨烯片相互搭接成的三维网络结构中,从而可暴露更多的活性位点和有效比表面积,利于展现更好的电化学性能。该复合材料用作超级电容器电极材料时,展现了高的比电容(在1 A·g^(-1)下的比电容高达1 804 F·g^(-1)),良好的倍率性能(在25 A·g^(-1)下比电容保持率仍在46%以上),以及优异的循环稳定性(在2 A·g^(-1)下循环2 000次的电容保持率为90.3%)。Ni(OH)2/reduced graphene oxide(RGO)nanocomposites for use as electrodes in electrochemical capacitors were prepared from GO and nickel nitrate by a one step hydrothermal method.The content of RGO in the composites was controlled by changing the GO/nickel nitrate mass ratio.Results indicate that Ni(OH)2nanobelts are dispersed uniformly in the three dimensional conducting network constructed by the RGO,which is favorable for their capacitive performance.The RGO content to achieve the best performance is26.7wt%.The best sample has a high specific capacity of1804F/g at1A/g,a remarkable capacitance retention rate of46%even at25A/g,and an excellent cycle life with90.3%capacitance retention after2000cycles at2A/g.

关 键 词：水热合成 NI(OH)2 石墨烯 电化学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]