Efficient coupling of MnO2/TiN on carbon cloth positive electrode and Fe2O3/TiN on carbon cloth negative electrode for flexible ultra-fast hybrid supercapacitors

Mai Li; Kailan Zhu; Zheyi Meng; Ruihua Hu; Jiale Wang; Chunrui Wang; Paul K. Chu

doi:10.1039/D1RA05742A

Efficient coupling of MnO₂/TiN on carbon cloth positive electrode and Fe₂O₃/TiN on carbon cloth negative electrode for flexible ultra-fast hybrid supercapacitors†

Mai Li,

*^a Kailan Zhu,^a Zheyi Meng,*^b Ruihua Hu,^a Jiale Wang,^a Chunrui Wang

^a and Paul K. Chu

Author affiliations

* Corresponding authors

^a College of Science, Donghua University, Shanghai 201620, China
E-mail: limai@dhu.edu.cn

^b State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science, Donghua University, Shanghai 201620, China
E-mail: mengzheyi@dhu.edu.cn

^c Department of Physics, Department of Materials Science and Engineering, Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China

Abstract

Recent research and development of energy storage devices has focused on new electrode materials because of the critical effects on the electrochemical properties of supercapacitors. In particular, MnO₂ and Fe₂O₃ have drawn extensive attention because of their low cost, high theoretical specific capacity, environmental friendliness, and natural abundance. In this study, MnO₂ ultrathin nanosheet arrays and Fe₂O₃ nanoparticles are fabricated on TiN nanowires to produce binder-free core–shell positive and negative electrodes for a flexible and ultra-fast hybrid supercapacitor. The MnO₂/TiN/CC electrode shows larger pseudocapacitance contributions than MnO₂/CC. For example, at a scanning rate of 2 mV s⁻¹, the pseudocapacitance contribution of MnO₂/TiN/CC is 87.81% which is nearly 25% bigger than that of MnO₂/CC (71.26%). The supercapacitor can withstand a high scanning rate of 5000 mV s⁻¹ in the 2 V window and exhibits a maximum energy density of 71.19 W h kg⁻¹ at a power density of 499.79 W kg⁻¹. Even at 5999.99 W kg⁻¹, it still shows an energy density of 31.3 W h kg⁻¹ and after 10 000 cycles, the device retains 81.16% of the initial specific capacitance. The activation mechanism is explored and explained.

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Article information

DOI: https://doi.org/10.1039/D1RA05742A
Article type: Paper
Submitted: 28 Jul 2021
Accepted: 26 Sep 2021
First published: 04 Nov 2021
This article is Open Access

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RSC Adv., 2021,11, 35726-35736

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Efficient coupling of MnO₂/TiN on carbon cloth positive electrode and Fe₂O₃/TiN on carbon cloth negative electrode for flexible ultra-fast hybrid supercapacitors

M. Li, K. Zhu, Z. Meng, R. Hu, J. Wang, C. Wang and P. K. Chu, RSC Adv., 2021, 11, 35726 DOI: 10.1039/D1RA05742A

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