基于超级电容器的TiN@CNTF电极制备及性能研究

超级电容器因其独特的性能在便携式、可穿戴电子器件领域有着很大的应用潜力。目前对超级电容器的研究主要集中在对超级电容器电极材料的研究上。碳纳米管纤维具有电导率高、力学性能好、柔韧性高等优点,是超级电容器的理想电极材料。但是,碳纳米管纤维电容量的提升被其较小的比表面积所限制。通过在碳纳米管纤维表面生长三维阵列能够有效提高碳管纤维的比表面积,从而增大电容量。因此,采用水热法,在碳纳米管纤维表面成功生长TiO2纳米阵列,并通过氨气氮化获得了TiN@CNTF电极材料。采用三电极测试TiN@CNTF电极在Na2SO4溶液中的比电容达到215.5mF/cm2,有望作为一种柔性超级电容器的负极材料得到应用。

Preparation and Electrical Properties of TiN@CNTF Electrode Based on Supercapacitor

Supercapacitors have great application potential in portable and wearable electronic devices due to their unique properties. Nowadays the research of supercapacitors mainly focuses on the electrode materials for supercapacitors. Carbon nanotube fiber (CNTF) has the advantages of high conductivity, good mechanical properties and high flexibility, which is the ideal electrode material for supercapacitors. However, the smaller specific surface area of CNTF restricts its capacity. The growth of three-dimensional arrays on the surface of CNTF can effectively increase the specific surface area of carbon nanotube fibers, so as to improve its capacity. In this paper, TiO₂ nano-array was successfully developed on the surface of CNTF by using hydrothermal method. TiN@CNTF electrode material was obtained by ammonia nitriding. The specific capacitance of the as-prepared TiN@CNTF electrode in Na₂SO₄ solution reaches 215.5 mF/cm², which is expected to be used as a negative electrode material for flexible supercapacitors.