1. Conductive Bismuth-Catecholate Metal–Organic Frameworks Grown on Ti3C2Tx Nanosheets for High-Performance Supercapacitors.
- Author
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Chen, Si, Zhang, Haoliang, Liu, Yong, Guo, Jiacheng, Li, Xu, Zhang, Mingyi, Zhang, Dongwei, Fang, Pengfei, and He, Chunqing
- Abstract
Ti
3 C2 Tx , as a member of the two-dimensional (2D) MXene family, is subject to severe self-restacking due to van der Waals forces between the surfaces of the nanosheets, which limits its application in supercapacitors. In addition, Ti3 C2 Tx always stores electrical energy non-Faradaic, resulting in a low specific capacitance about 100 F g–1 in basic electrolytes. In this work, we report conductive bismuth-catecholate metal–organic frameworks (Bi-(HHTP)) with one-dimensional (1D) channels grown on the surfaces of 2D Ti3 C2 Tx nanosheets (Ti3 C2 Tx /Bi-(HHTP)) for supercapacitors. In the hybrid structure, conductive Bi-(HHTP) serves not only as the spacers to relieve the self-stacking of Ti3 C2 Tx nanosheets but also as the active component to provide battery-type capacitance. Meanwhile, Ti3 C2 Tx nanosheets provide skeletons for the conductive Bi-(HHTP), further enhancing the overall specific capacitance of Ti3 C2 Tx /Bi-(HHTP). By taking advantage of appropriate porosity, redox activity, and good properties of charge transport of Bi-(HHTP), the specific capacitance of Ti3 C2 Tx nanosheets is significantly increased. The Ti3 C2 Tx /Bi-(HHTP) electrode obtained exhibits an impressive specific capacitance of 326 F g–1 at 0.5 A g–1 and a good rate capacity of 52%. Additionally, an asymmetric device is assembled with a Ni-(OH)2 cathode and a Ti3 C2 Tx /Bi-(HHTP) anode, demonstrating remarkable performance with a maximum specific energy of 22.3 Wh kg–1 and a maximum specific power of 11.2 kW kg–1 . This work presents a promising strategy for developing high-performance supercapacitor electrodes based on Ti3 C2 Tx , offering potential avenues for enhancing performance in energy storage applications. [ABSTRACT FROM AUTHOR]- Published
- 2024
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