摘要
二维材料碳化钛(Ti_(3)C_(2)Tx)因具有高导电性和大比表面积的特点,在作为超级电容电极材料时,可以实现较高的能量密度。然而,Ti_(3)C_(2)Tx在储能过程中会出现不可逆的氧化失活反应,而且它与基底间的结合力较差,这将导致碳化钛超级电容的循环稳定性欠佳,极大地阻碍了其作为电极材料的广泛应用。将Ti_(3)C_(2)Tx作为活性层与氧化石墨烯(GO)分层复合制作成超级电容电极,覆盖在Ti_(3)C_(2)Tx薄膜之上的GO层可以削弱氧化失活反应。同时,对电极的热处理可提升Ti_(3)C_(2)Tx对基底的附着力。这使得Ti_(3)C_(2)Tx/GO复合电极的充放电循环稳定性明显改善,在5000次循环之后其容量仍高于初始容量。该设计可为制备高循环稳定性超级电容提供参考。
Due to high conductivity and large specific surface area,2D titanium carbide(Ti_(3)C_(2)Tx)can be used as an electrode material for supercapacitors with high energy density.However,the deactivation of Ti_(3)C_(2)Tx through irreversible oxidation in energy storage and the poor surface interaction between Ti_(3)C_(2)Tx and substrates result in poor cycle stabilities of Ti_(3)C_(2)Tx supercapacitors,thereby greatly hindering wide applications of energy storage materials.In this paper,Ti_(3)C_(2)Tx is used as an active layer and covered by a graphene oxide(GO)film.The GO film weakens the oxidation deactivation of Ti_(3)C_(2)Tx.Meanwhile,a heat treatment procedure of the electrode is involved to improve the surface interaction.This makes the cycling stability of the Ti_(3)C_(2)Tx/GO composite electrodes significantly improved,and the capacitance is higher than the initial one after 5000 cycles.The results can provide an innovative pathway for the design and preparation of high cycle-stability supercapacitors.
作者
张光彩
陈希
ZHANG Guangcai;CHEN Xi(Institute of Photonic Chip,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Optical-Electronic and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《光学仪器》
2023年第5期44-52,共9页
Optical Instruments
基金
国家自然科学基金面上项目(11974247)。
