Xia Chenji, Luo Yijia, Bin Xiaoqing, Gao Bowen, Que Wenxiu
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Shaanxi Engineering Research Center of Advanced Energy Materials and Devices, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi, People's Republic of China.
School of Mechanical and Construction Engineering, Taishan University, Tai'an 271021, Shandong, People's Republic of China.
Nanotechnology. 2023 Apr 11;34(25). doi: 10.1088/1361-6528/acc744.
Combining the new two-dimensional conductive MXene with transition metal oxide to build composite structure is a promising path to improve the conductivity of metal oxide. However, a critical challenge still remains in how to achieve a good combination of MXene and metal oxide. Herein, we develop a facile hydrothermal route to synthesize the MnO/TiCTcomposite electrode for supercapacitors by synergistically coupling MnOnanowires with TiCTMXene nanoflakes. Compared with the pure MnOelectrode, the morphology of the MnO/TiCTcomposite electrode changes from nanowires to nanoflowers. Moreover, the overall conductivity and electrochemical performance of the composite electrode are greatly improved due to an addition of TiCTMXene. The specific capacitance of the MnO/TiCTcomposite electrode achieves 210.8 F·gat a scan rate of 2 mV·s, while that of the pure MnOelectrode is only 55.2 F·g. Furthermore, the specific capacitance of the MnO/TiCTcomposite electrode still can remain at 97.2% even after 10 000 charge-discharge cycles, revealing an excellent cycle stability. The synthesis strategy of this work can pave the way for the research and practical application of the electrode materials for supercapacitors.
将新型二维导电MXene与过渡金属氧化物相结合构建复合结构是提高金属氧化物导电性的一条很有前景的途径。然而，在如何实现MXene与金属氧化物的良好结合方面仍然存在一个关键挑战。在此，我们开发了一种简便的水热路线，通过将MnO纳米线与TiCT MXene纳米片协同耦合来合成用于超级电容器的MnO/TiCT复合电极。与纯MnO电极相比，MnO/TiCT复合电极的形态从纳米线变为纳米花。此外，由于添加了TiCT MXene，复合电极的整体导电性和电化学性能得到了极大提高。MnO/TiCT复合电极在扫描速率为2 mV·s时的比电容达到210.8 F·g，而纯MnO电极的比电容仅为55.2 F·g。此外，MnO/TiCT复合电极即使在10000次充放电循环后，比电容仍可保持在97.2%，显示出优异的循环稳定性。这项工作的合成策略可为超级电容器电极材料的研究和实际应用铺平道路。
