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https://hdl.handle.net/2440/123274
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Type: | Journal article |
Title: | Self-branched α-MnO₂/δ-MnO₂ heterojunction nanowires with enhanced pseudocapacitance |
Other Titles: | Self-branched alpha-MnO(2)/delta-MnO(2) heterojunction nanowires with enhanced pseudocapacitance |
Author: | Zhu, C. Yang, L. Seo, J.K. Zhang, X. Wang, S. Shin, J.W. Chao, D. Zhang, H. Meng, Y.S. Fan, H.J. |
Citation: | Materials horizons, 2017; 4(3):415-422 |
Publisher: | Royal Society of Chemistry |
Issue Date: | 2017 |
ISSN: | 2051-6347 2051-6355 |
Statement of Responsibility: | Changrong Zhu, Lu Yang, Joon Kyo Seo, Xiao Zhang, Shen Wang, JaeWook Shin, Dongliang Chao, Hua Zhang, Ying Shirley Meng and Hong Jin Fan |
Abstract: | Despite the extensive research on MnO₂ as a pseudocapacitor electrode material, there has been no report on heterostructures of multiple phase MnO₂. Here we report the combination of two high-capacitance phases of MnO₂, namely, α-MnO₂ nanowires and δ-MnO₂ ultrathin nanoflakes, to form a core-branch heterostructure nanoarray. This material and structure design not only increases the mass loading of active materials (from 1.86 to 3.37 mg cm²), but also results in evident pseudocapacitance enhancement (from 28 F g⁻¹ for pure nanowires to 178 F g⁻ for heterostructures at 5 mV s⁻¹). The areal capacitance is up to 783 mF cm⁻² at 1 mV s⁻¹. Upon 20 000 cycles, the heterostructure array electrode still delivers a reversible capacitance above 100 F g⁻¹ at 4.5 A g⁻¹. Kinetic analysis reveals that capacitances due to both capacitive and diffusion controlled processes have been enlarged for the self-branched heterostructure array. This work presents a new route to improve the electrochemical performance of MnO₂ as a binder-free supercapacitor electrode. |
Description: | Published on 07 February 2017 |
Rights: | This journal is©The Royal Society of Chemistry 2017 |
DOI: | 10.1039/c6mh00556j |
Published version: | http://dx.doi.org/10.1039/c6mh00556j |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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