超级电容器
材料科学
碳纳米管
纳米技术
多孔性
堆积
电容
碳纤维
电极
接触面积
复合材料
复合数
化学
物理化学
有机化学
作者
Kai Yang,Min Luo,Daotong Zhang,Chaozheng Liu,Zhao Li,Liangcai Wang,Weimin Chen,Xiaoyan Zhou
标识
DOI:10.1016/j.cej.2021.132002
摘要
Porous carbon (PC) can effectively alleviate the typical self-stacking phenomenon of 2D MXene-based films as a spacer, and can easily customize their porous structure. Nevertheless, the contact between 3D PC and 2D MXene flakes is generally presented at a point-to-point form owing to the irregular shape of PC, leading to a low efficiency on electron delivery and stress concentration with a fragile characteristic in the resulting films. Herein, 1D carbon nanotube (CNT) was introduced to construct a highly conductive net structure, tightly anchoring PC on MXene flakes, thus ensuring fast electron delivery by increasing the contact area between MXene and PC. Additionally, the interwoven CNTs bridge the horizontal MXene flakes, making internal structure more integral, thereby enhancing the flexibility. Consequently, the Ti3C2Tx (a typical MXene)/CNT/PC (TCP) film has an ability to bear a large scan rate of 1 V s−1 and shows a high areal specific capacitance of 364.8 mF cm−2 at 0.5 mA cm−2 which remains above 80% even at a high current density of 50 mA cm−2. Furthermore, the fabricated flexible quasi-solid-state supercapacitor (SC) demonstrates a large areal energy density of 10.5 μ Wh cm−2 at 29.8 μ W cm−2. This study provides a promising approach to overcome the poor flexibility of MXene/PC film without sacrificing the conductivity, meanwhile paving a way for the development of flexible SCs with large charge storage capacity and high rate capability.
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