用于高性能超级电容器的金属有机骨架衍生Co(OH)_(2)/C-N@GP纳米复合材料  

Metal-organic-frameworks-derived Co(OH)2/nitrogen-doped carbon graphene nanocomposites for high-performance supercapacitors

作　　者：何应 张宇 何清 刘辉[1] 李亮[1] HE Ying;ZHANG Yu;HE Qing;LIU Hui;LI Liang(School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学材料科学与工程学院,武汉430205

出　　处：《无机化学学报》2023年第12期2432-2440,共9页Chinese Journal of Inorganic Chemistry

基　　金：湖北省教育厅科学研究计划项目(No.D20181507);武汉工程大学科学研究基金项目(No.K201509,K201805)资助。

摘　　要：本文报道一种制备β-Co(OH)_(2)/氮掺杂碳石墨烯纳米复合材料(Co(OH)_(2)/C-N@GP)的方法。首先,我们通过在含羧基的聚苯乙烯(PS)乙醇分散体中使Co(NO_(3))2·6H_(2)O与2-甲基咪唑反应,合成了ZIF-67/聚苯乙烯的复合材料。然后将ZIF-67/聚苯乙烯复合材料高温碳化,同时与硫代乙酰胺和石墨烯反应生成Co(SO_(4))_(2)/C-N@GP。最后,Co(SO_(4))_(2)/C-N@GP在KOH水溶液中浸泡以获得Co(OH)_(2)/C-N@GP纳米复合材料。所制备的Co(OH)_(2)/C-N@GP的扫描电镜图显示尺寸为10~20 nm的Co(OH)_(2)很好地分散在石墨烯上。电化学分析表明Co(OH)_(2)/C-N作为超级电容器的电极材料表现出典型的法拉第电荷转移行为,并且当石墨烯存在时,其比电容可显著增强。在2 mol·L^(-1)KOH中,Co(OH)_(2)/C-N@GP在2 A·g^(-1)下表现出985.4 F·g^(-1)的高比电容,1000次循环后的比电容保持率为76.6%。An effective method to prepareβ-Co(OH)_(2)/nitrogen-doped carbon graphene(Co(OH)_(2)/C-N@GP)nanocom-posites is presented in this work.First,we synthesized a composite of ZIF-67 and polystyrene by reacting Co(NO_(3))_(2)·6H_(2)O with 2-methylimidazole in a polystyrene-COOH ethanol dispersion.The ZIF-67/polystyrene composite was carbonized and subsequently reacted with thioacetamide and graphene to produce Co(SO_(4))_(2)/[e-mail],Co(SO_(4))_(2)/C-N@GP was soaked in KOH aqueous solution to obtain Co(OH)_(2)/C-N@GP nanocomposites.The scanning electron microscope image of obtained Co(OH)_(2)/C-N@GP showed Co(OH)_(2)with sizes of 10-20 nm well dispersed on the graphene.Electrochemical analysis indicated that Co(OH)_(2)/C-N as an electrode material exhibits typical Faraday charge-transfer behavior for supercapacitors.The specific capacitance of Co(OH)_(2)/C-N can be enhanced when graphene is present.The Co(OH)_(2)/C-N@GP exhibited a high specific capacitance of 985.4 F·g^(-1)at 2 A·g^(-1)in 3 mol·L^(-1)KOH with a specific capacitance retention rate of 76.6%after 1000 cycles.

关 键 词：金属有机骨架 石墨烯 氢氧化钴 纳米复合材料 超级电容器 

分 类 号：TB33[一般工业技术—材料科学与工程]