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作 者:何清 牟雨航 孟辰尧 张宇 刘辉[1] 李亮[1] HE Qing;MOU Yuhang;MENG Chenyao;ZHANG Yu;LIU Hui;LI Liang(School of Materials 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,湖北武汉430205
出 处:《武汉工程大学学报》2024年第3期258-266,共9页Journal of Wuhan Institute of Technology
基 金:湖北省教育厅科学研究计划项目(D20181507);武汉工程大学科学研究基金(K201509,K201805);武汉工程大学研究生教育创新基金(CX2022212)。
摘 要:金属有机骨架(MOFs)材料因其具有较高的比表面积和结构功能多样性而在超级电容器中具有广阔的应用前景。通过溶剂热法制备电化学性能优异的碳纳米管@镍基金属有机骨架(CNT@Ni-MOFs)复合材料。使用X射线衍射、扫描电子显微镜及X射线光电子能谱对其成分和结构进行表征,研究结果表明:CNT@Ni-MOFs结构是由柔性CNT连接着棒状结构的Ni-MOFs形成的导电网络结构,其棒状结构的Ni-MOFs直径约0.5μm,长度为4~5μm。研究了反应时间对CNT@Ni-MOFs结构和电化学性能的影响,结果表明:当反应时间为12 h时,Ni-MOFs生长完整且均匀,Ni-MOFs颗粒数量适中且均匀负载于CNT上,同时还减少了团聚发生。CNT@Ni-MOFs复合电极具有比单独Ni-MOFs更好的比电容性能,其中CNT@Ni-MOFs12在电流密度1 A/g下的比电容达到719.8 F/g,而Ni-MOFs的比电容仅为87.1 F/g,且CNT的比电容也仅仅为43.5 F/g。此外,扫描速率为200 mV/s下,CNT@Ni-MOFs12电极材料经1 000次的线性伏安循环测试后其比电容保持率为96.8%。Metal-organic frameworks(MOFs)materials have attracted considerable attention in supercapacitors(SCs),owing to their high surface area,tailorable pore sizes and shapes,and various framework architectures.In this work,carbon nanotube@nickel-based metal-organic frameworks(CNT@Ni-MOFs)composites with excellent electrochemical properties were synthesized by a solvethermal method and characterized by X-ray diffraction,scanning electron microcopy and X-ray photoelectron spectrometry.The results show that the CNT@Ni-MOFs has a conductive network structure formed by flexible CNTs connected to Ni-MOFs in a rod-like structure with a diameter of about 0.5μm and a length of 4-5μm.The effect of reaction time on the structure and electrochemical performance of CNT@Ni-MOFs was investigated.The results showed that when the reaction time was 12 h,the growth of Ni-MOFs was complete and uniform,and the number of Ni-MOFs particles was moderate and uniformly loaded on CNT,which reduces the occurrence of agglomeration.The CNT@Ni-MOFs composite electrode has better specific capacitance performance than Ni-MOFs alone.The CNT@Ni-MOFs12 electrode exhibited a high specific capacitance of 719.8 F/g at a current density of 1 A/g,while that of Ni-MOFs was only 87.1 F/g and that of CNT was 43.5 F/g.Meanwhile,the specific capacitance retention of CNT@Ni-MOFs12 was about 96.8%after cyclic voltammetry for 1000 cycles at a scan rate of 200 mV/s.
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