| 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 |
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| 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（NO3）2·6H2O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（SO4）2/C-N@GP。最后，Co（SO4）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，1 000次循环后的比电容保持率为76.6%。 |
| 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 |
| 基金项目: 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 |
| Abstract: An effective method to prepare β-Co(OH)2/nitrogen-doped carbon graphene (Co(OH)2/C-N@GP) nanocomposites is presented in this work. First, we synthesized a composite of ZIF-67 and polystyrene by reacting Co(NO3)2·6H2O 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(SO4)2/C-N@GP. Finally, Co(SO4)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 1 000 cycles. |
| Keywords: metal-organic frameworks graphene cobalt hydroxide nanocomposites supercapacitor |
| 投稿时间：2023-02-08 修订日期：2023-10-02 |
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| 何应,张宇,何清,刘辉,李亮.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[J].无机化学学报,2023,39(12):2432-2440. |
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