Electrochemically Stable Cobalt-Zinc Mixed Oxide/hydroxide Hierarchical Porous Film Electrode for High-performance Asymmetric Supercapacitor

Yang, Hanbin and Zhu, Xinqiang and Zhu, Enhui and Lou, Gaobo and Wu, Yatao and Lu, Yingzhuo and Wang, Hanyu and Song, Jintao and Tao, Yingjie and Pei, Gu and Chu, Qindan and Chen, Hao and Ma, Zhongqing and Song, Pingan ORCID: https://orcid.org/0000-0003-1082-652X and Shen, Zhehong (2019) Electrochemically Stable Cobalt-Zinc Mixed Oxide/hydroxide Hierarchical Porous Film Electrode for High-performance Asymmetric Supercapacitor. Nanomaterials, 9 (3):345. pp. 1-16. ISSN 2079-4991

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Abstract

Construction of electrochemically stable positive materials is still a key challenge to accomplish high rate performance and long cycling life of asymmetric supercapacitors (ASCs). Herein, a novel cobalt–zinc mixed oxide/hydroxide (CoZn-MOH) hierarchical porous film electrode was facilely fabricated based on a cobalt–zinc-based metal–organic framework for excellent utilization in ASC. The as-constructed hierarchical porous film supported on conductive Ni foam possesses a rough surface and abundant macropores and mesopores, which allow fast electron transport, better exposure of electrochemically active sites, and facile electrolyte access and ion diffusion. Owing to these structural merits in collaboration, the CoZn-MOH electrode prepared with a zinc feeding ratio up to 45% at 110 min of heating time (CoZn-MOH-45-110) exhibited a high specific capacitance of 380.4 F·g−1, remarkable rate capability (83.6% retention after 20-fold current increase), and outstanding cycling performances (96.5% retention after 10,000 cycles), which exceed the performances of similar active electrodes. Moreover, an ASC based on this CoZn-MOH-45-110 electrode exhibited a high specific capacitance of 158.8 F·g−1, an impressive energy density of 45.8 Wh·kg−1, superior rate capability (83.1% retention after 50-fold current increase), and satisfactory cycling stability (87.9% capacitance retention after 12,000 cycles).


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 21 Jan 2021 05:03
Last Modified: 01 Feb 2021 01:04
Uncontrolled Keywords: hierarchical porous film; cobalt–zinc mixed oxide/hydroxide; supercapacitor; high stability
Fields of Research (2008): 03 Chemical Sciences > 0302 Inorganic Chemistry > 030299 Inorganic Chemistry not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
40 ENGINEERING > 4004 Chemical engineering > 400402 Chemical and thermal processes in energy and combustion
40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Socio-Economic Objectives (2020): 24 MANUFACTURING > 2409 Industrial chemicals and related products > 240906 Inorganic industrial chemicals
17 ENERGY > 1703 Energy storage, distribution and supply > 170304 Energy storage (excl. hydrogen and batteries)
Identification Number or DOI: https://doi.org/10.3390/nano9030345
URI: http://eprints.usq.edu.au/id/eprint/40555

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