Nanostrucutured MnO2-TiN nanotube arrays for advanced supercapacitor electrode material

Peng Ren; Chao Chen; Xiuchun Yang

doi:10.1038/s41598-022-05167-1

Nanostrucutured MnO₂-TiN nanotube arrays for advanced supercapacitor electrode material

Sci Rep. 2022 Feb 8;12(1):2088. doi: 10.1038/s41598-022-05167-1.

Authors

Peng Ren^{1

2}, Chao Chen³, Xiuchun Yang^{4

5

6}

Affiliations

¹ Shanghai Key Laboratory of R&D for Metallic Functional Materials, Tongji University, Shanghai, 201804, People's Republic of China.
² Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai, 201804, People's Republic of China.
³ School of Chemistry and Civil Engineering, Shaoguan University, Shaoguan, 512005, People's Republic of China.
⁴ Shanghai Key Laboratory of R&D for Metallic Functional Materials, Tongji University, Shanghai, 201804, People's Republic of China. yangxc@tongji.edu.cn.
⁵ Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai, 201804, People's Republic of China. yangxc@tongji.edu.cn.
⁶ School of Materials Science and Engineering, Tongji University, Shanghai, 201804, People's Republic of China. yangxc@tongji.edu.cn.

Abstract

The capacitance of MnO₂ supercapacitors (SCs) is not high as expected due to its low conductivity of MnO₂. The synergistic effects of MnO₂ with high theoretical specific capacitance and TiN with high theoretical conductivity can extremely enhance the electrochemical performance of the MnO₂-TiN electrode material. In this work, we synthesized different nanostructured and crystalline-structured MnO₂ modified TiN nanotube arrays electrode materials by hydrothermal method and explained the formation mechanism of different nanostructured and crystalline-structured MnO_2. The influences of MnO₂ nanostructures and crystalline-structures on the electrochemical performance has been contrasted and discussed. The specific capacitance of δ-MnO₂ nanosheets-TiN nanotube arrays can reach 689.88 F g^-1, the highest value among these samples TN-MO-SS, TN-MO-S, TN-MO-SR, TN-MO-RS, and TN-MO-R. The reason is explained based on MnO₂ nanostructure and crystalline-structure and electron/ion transport properties. The specific capacitance retention rates are 97.2% and 82.4% of initial capacitance after 100 and 500 cycles, respectively, indicating an excellent charging-discharging cycle stability.

Abstract

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