Rational design of flower-like MnO2/Ti3C2T x composite electrode for high performance supercapacitors

Chenji Xia; Yijia Luo; Xiaoqing Bin; Bowen Gao; Wenxiu Que

doi:10.1088/1361-6528/acc744

Rational design of flower-like MnO₂/Ti₃C₂T _x composite electrode for high performance supercapacitors

Nanotechnology. 2023 Apr 11;34(25). doi: 10.1088/1361-6528/acc744.

Authors

Chenji Xia¹, Yijia Luo¹, Xiaoqing Bin¹, Bowen Gao², Wenxiu Que¹

Affiliations

¹ 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.
² School of Mechanical and Construction Engineering, Taishan University, Tai'an 271021, Shandong, People's Republic of China.

PMID: 36962973
DOI: 10.1088/1361-6528/acc744

Abstract

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 MnO₂/Ti₃C₂T_xcomposite electrode for supercapacitors by synergistically coupling MnO₂nanowires with Ti₃C₂T_xMXene nanoflakes. Compared with the pure MnO₂electrode, the morphology of the MnO₂/Ti₃C₂T_xcomposite 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 Ti₃C₂T_xMXene. The specific capacitance of the MnO₂/Ti₃C₂T_xcomposite electrode achieves 210.8 F·g^-1at a scan rate of 2 mV·s^-1, while that of the pure MnO₂electrode is only 55.2 F·g^-1. Furthermore, the specific capacitance of the MnO₂/Ti₃C₂T_xcomposite 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.

Keywords: MnO2; Ti3C2T x MXene; composite electrode; electrochemical performance; flexible supercapacitor.