NiCo_(2)O_(4)/碳纳米管纤维织物的制备及电化学性能研究

Preparation and electrochemical properties of NiCo_(2)O_(4)/carbon nanotube fiber fabric

采用浮动催化化学气相沉积工艺,结合加捻和针织技术制备碳纳米管纤维织物;经热氧化和酸处理过程得到表面处理后的碳纳米管纤维织物(ACNTFF);通过水热法和热处理制得钴酸镍(NiCo_(2)O_(4))/ACNTFF织物电极;研究水热反应时间对织物电极的形貌、负载量、导电性、结构和电化学性能的影响。结果表明:NiCo_(2)O_(4)纳米线阵列在水热反应6 h的织物表面分布相对均匀;水热反应时间的延长可增加NiCo_(2)O_(4)的负载量;制备的NiCo_(2)O_(4)/ACNTFF具有良好的导电性;水热反应6 h的NiCo_(2)O_(4)/ACNTFF电极具有最优综合电化学性能,包括较高的面积比电容(面积比电容为1630.1 mF/cm^(2))、良好的倍率性能(电流密度为50 mA/cm^(2)时的电容保持率为70.7%)和良好的循环稳定性(10000次充放电循环后的电容保持率为80.4%)。

Carbon nanotube fiber fabrics were prepared by floating catalytic chemical vapor deposition combined with twisting and knitting techniques.Surface-treated carbon nanotube fiber fabrics(ACNTFF)were prepared by thermal oxidation and acid treatment.Nickel cobalt oxide(NiCo_(2)O_(4))/ACNTFF fabric electrode was prepared by hydrothermal method and heat treatment.The effects of hydrothermal reaction time on the morphology,loading,conductivity,structure and electrochemical properties of fabric electrodes were investigated.The results showed that NiCo_(2)O_(4)nanowire arrays were distributed uniformly on the surface of the fabric after 6 h of hydrothermal reaction;the loading of NiCo_(2)O_(4)could be increased with the extension of hydrothermal reaction time;NiCo_(2)O_(4)/ACNTFF had good electrical conductivity;the NiCo_(2)O_(4)/ACNTFF electrode exposed to hydrothermal reaction for 6 h had the optimal comprehensive electrochemical performance,including a high area specific capacitance of 1630.1 mF/cm^(2),good rate performance(capacitance retention of 70.7%at the current density of 50 mA/cm^(2))and good cycle stability(capacitance retention of 80.4%after 10000 charge-discharge cycles).