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Open AccessArticle

Electrodeposited Porous Mn1.5Co1.5O4/Ni Composite Electrodes for High-Voltage Asymmetric Supercapacitors

1
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan
2
Department of Chemical and Environmental Engineering, University of Nottingham, Selangor 43500, Malaysia
3
Department of Materials Engineering, Kun Shan University, Tainan 710, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Bingqing Wei
Materials 2017, 10(4), 370; https://doi.org/10.3390/ma10040370
Received: 12 February 2017 / Revised: 22 March 2017 / Accepted: 29 March 2017 / Published: 31 March 2017
(This article belongs to the Special Issue Materials for Electrochemical Capacitors and Batteries)
Mesoporous Mn1.5Co1.5O4 (MCO) spinel films were prepared directly on a conductive nickel (Ni) foam substrate via electrodeposition and an annealing treatment as supercapacitor electrodes. The electrodeposition time markedly influenced the surface morphological, textural, and supercapacitive properties of MCO/Ni electrodes. The (MCO/Ni)-15 min electrode (electrodeposition time: 15 min) exhibited the highest capacitance among three electrodes (electrodeposition times of 7.5, 15, and 30 min, respectively). Further, an asymmetric supercapacitor that utilizes (MCO/Ni)-15 min as a positive electrode, a plasma-treated activated carbon (PAC)/Ni electrode as a negative electrode, and carboxymethyl cellulose-lithium nitrate (LiNO3) gel electrolyte (denoted as (PAC/Ni)//(MCO/Ni)-15 min) was fabricated. In a stable operation window of 2.0 V, the device exhibited an energy density of 27.6 Wh·kg−1 and a power density of 1.01 kW·kg−1 at 1 A·g−1. After 5000 cycles, the specific energy density retention and power density retention were 96% and 92%, respectively, demonstrating exceptional cycling stability. The good supercapacitive performance and excellent stability of the (PAC/Ni)//(MCO/Ni)-15 min device can be ascribed to the hierarchical structure and high surface area of the (MCO/Ni)-15 min electrode, which facilitate lithium ion intercalation and deintercalation at the electrode/electrolyte interface and mitigate volume change during long-term charge/discharge cycling. View Full-Text
Keywords: spinel; Ni foam; electrodeposition; gel electrolyte; asymmetric supercapacitor spinel; Ni foam; electrodeposition; gel electrolyte; asymmetric supercapacitor
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MDPI and ACS Style

Pan, G.-T.; Chong, S.; Yang, T.C.-K.; Huang, C.-M. Electrodeposited Porous Mn1.5Co1.5O4/Ni Composite Electrodes for High-Voltage Asymmetric Supercapacitors. Materials 2017, 10, 370. https://doi.org/10.3390/ma10040370

AMA Style

Pan G-T, Chong S, Yang TC-K, Huang C-M. Electrodeposited Porous Mn1.5Co1.5O4/Ni Composite Electrodes for High-Voltage Asymmetric Supercapacitors. Materials. 2017; 10(4):370. https://doi.org/10.3390/ma10040370

Chicago/Turabian Style

Pan, Guan-Ting; Chong, Siewhui; Yang, Thomas C.-K.; Huang, Chao-Ming. 2017. "Electrodeposited Porous Mn1.5Co1.5O4/Ni Composite Electrodes for High-Voltage Asymmetric Supercapacitors" Materials 10, no. 4: 370. https://doi.org/10.3390/ma10040370

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