微电子打印机制备ZnMn_(2)O_(4)-CNTs平面超级电容器及其性能研究

ZnMn_(2)O_(4)-CNTs based planar supercapacitors by microelectronic printing

近年来,具备可穿戴和柔性功能的便携式电子设备备受关注,对提供其能量的储能器件研究也逐渐成为热点。平面超级电容器具有功率密度高、充放电速率快、循环稳定性好、易于集成等优点,是重要的可穿戴和柔性电子产品的潜在电源。在电极材料中,锰酸锌(ZnMn_(2)O_(4))拥有较高的理论比电容,但存在电导率较差的难题,这影响了其循环稳定性和功率密度。碳纳米管(CNTs)具有优异的长期稳定性和高功率密度,以及较好的电导率,因此可以通过引入CNTs改善ZnMn_(2)O_(4)电导率。微电子打印技术是是一种简便的制备平面超级电容器的新方法。本文采用水热法制备出ZnMn_(2)O_(4)和CNTs复合材料,并且利用微电子打印机中的点胶打印功能,在聚对苯二甲酸乙二醇酯(PET)衬底上制备得到基于ZnMn_(2)O_(4)-CNTs平面超级电容器。结果表明,采用该方法制备得到的ZnMn_(2)O_(4)-CNTs平面超级电容器,由于引入了CNTs,改善了ZnMn_(2)O_(4)的电导率,能展现出更好的性能。在0.023 mA cm^(-2)电流密度下其比电容达到了13.687 mF cm^(-2),在10000圈的循环后,电容保持率高达99.47%,远优于纯ZnMn_(2)O_(4)的电化学性能。

In recent years,portable electronic devices with wearable and flexible functions have attracted much attention,and research on their energy storage devices has gradually become a hot topic.Planar supercapacitors have the advantages of high power density,fast charging/discharging rates,good cycling stability,and easy integration,making them a potential power source for wearable and flexible electronic devices.Among the electrode materials,zinc manganate(ZnMn_(2)O_(4))has a higher theoretical specific capacitance,but along with poor conductivity,which impede its long-term stability and power density.Carbon nanotubes(CNTs)have excellent long-term stability and high power density,as well as good conductivity.Therefore,the conductivity of ZnMn_(2)O_(4)based electrode can be improved by the introduction of CNTs.Microelectronic printing technology is a new and convenient method for preparing planar supercapacitors.In this paper,ZnMn_(2)O_(4)-CNT composite was prepared by hydrothermal method,and then ZnMn_(2)O_(4)-CNTs based planar supercapacitor was prepared on polyethylene terephthalate substrate by using the dispensing printing function of microelectronic printer.Electrochemical performance evaluation reveals that the ZnMn_(2)O_(4)-CNTs based planar supercapacitor exihibts better conductivity and enhanced electrochemical performance in compare with the ZnMn_(2)O_(4).one.The ZnMn_(2)O_(4)-CNTs based planar supercapacitor cah deliver a high specific areal capacitance of 13.687 mF cm^(-2)at the current density of 0.023 mA cm^(-2),and a capacitance retention capability of 99.47%after 10000 cycles,which is much better than the electrochemical performance of pure ZnMn_(2)O_(4)based planar supercapacitor.