金属氧化物因其高容量、低成本、适于商业化、环保等特点而常被应用于超级电容器电极材料.以Mn-MOF为前驱体,将其置于乙醇中与Co(NO3)2进行离子交换和刻蚀反应,然后在空气中热处理,最后在碳布(carbon cloth,CC)基体上得到高度结晶的CoMn2O4二维纳米棒结构.对不同Co(NO3)2添加量下制备的CoMn2O4/CC和直接热处理得到的Mn2O3/CC进行SEM和XRD分析,并且通过循环伏安测试、恒电流充放电测试和交流阻抗测试等进行电化学性能测试.结果表明:0.3 g Co(NO3)2刻蚀后CoMn2O4/CC的母体结构相对保留良好,形成中空的纳米空心结构,热处理后在碳布上原位生长的垂直纳米棒结构均一密集地包裹碳纤维,由于无任何黏合剂的添加,确保较高的力学稳定性和导电性.在1.2 mA·cm-2的电流密度下,电极材料具有809.8 mF·cm-2的面积比电容;在5 mA·cm-2的电流密度下循环5000周次后电容保持率为79.1％,是具有潜在应用前景的一种电极材料.
Preparation and electrochemical properties of two-dimensional nanorod structure CoMn2O4/CC electrode materials
Metal oxides are often used as electrode materials for supercapacitors because of their high capacity,low cost,suitability for commercialization,and environmental friendliness. In this study,Mn-MOF was used as a precursor and placed in ethanol for ion exchange and etching reaction with Co(NO3)2,followed by heat treatment in air,and finally highly crystalline CoMn2O4 two-dimensional nanorod structures were obtained on a carbon cloth(CC) substrate. SEM and XRD analyses of CoMn2O4/CC prepared with different Co(NO3)2 additions and Mn2O3/CC obtained by direct heat treatment were performed,and electrochemical properties were measured by cyclic voltammetry test,constant current charge/discharge test and AC impedance test. The results show that the parent structure of CoMn2O4/CC is relatively well preserved after 0.3 g Co(NO3)2 etching,forming a nano-hollow structure,and the vertical nanorod structures grow in situ on carbon cloth after heat treatment wrapping carbon fibers uniformly and densely,ensuring high mechanical stability and electrical conductivity due to the absence of any binder addition. The electrode material has an area specific capacitance of 809.8 mF·cm-2 at the current density of 1.2 mA·cm-2 and the capacitance retention is 79.1％ after 5000 cycles at the current density of 5 mA·cm-2,showing potential application prospects.
万方数据
