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Influence of gas diffusion layer current collector on electrochemical performance of Ni(OH)2 nanostructures

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  • Received: 13 April 2020Revised: 22 August 2020Accepted: 25 August 2020Available online: 27 August 2020
  • We report the electrochemical performance of Ni(OH)2 on gas diffusion layer (GDL) substrate owning to the fact that different current collectors resulting in different electrochemical performances. The Ni(OH)2 working electrode was successfully prepared by a simple method and its electrochemical performance was investigated in 1M NaOH electrolyte. The electrochemical results show that Ni(OH)2 on GDL substrate provides the maximum specific capacitance value of 418.11 F•g-1 at 1 A•g-1. Furthermore, the Ni(OH)2 electrode delivers a high specific energy of 17.25 Wh•kg-1 at specific power of 272.5 W•kg-1 and the cyclic stability retains about 81% after 1000 cycles. Clearly, SEM coupled with EDS results imply that sodium deposition occurring after long-time cycling causes the reduction of the specific capacitance. The present work suggests that light-weight of GDL could be considered as a promising current collector in electrochemical studies of Ni-based electroactive materials for energy storage applications in order to overcome the problem of oxide layer on metal-foam substrates.
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Influence of gas diffusion layer current collector on electrochemical performance of Ni(OH)2 nanostructures

  • Corresponding author:

    Santi Maensiri    E-mail: santimaensiri@gmail.com; santimaensiri@g.sut.ac.th

  • 1. School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
  • 2. SUT CoE on Advanced Functional Materials, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
  • 3. Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand

Abstract: We report the electrochemical performance of Ni(OH)2 on gas diffusion layer (GDL) substrate owning to the fact that different current collectors resulting in different electrochemical performances. The Ni(OH)2 working electrode was successfully prepared by a simple method and its electrochemical performance was investigated in 1M NaOH electrolyte. The electrochemical results show that Ni(OH)2 on GDL substrate provides the maximum specific capacitance value of 418.11 F•g-1 at 1 A•g-1. Furthermore, the Ni(OH)2 electrode delivers a high specific energy of 17.25 Wh•kg-1 at specific power of 272.5 W•kg-1 and the cyclic stability retains about 81% after 1000 cycles. Clearly, SEM coupled with EDS results imply that sodium deposition occurring after long-time cycling causes the reduction of the specific capacitance. The present work suggests that light-weight of GDL could be considered as a promising current collector in electrochemical studies of Ni-based electroactive materials for energy storage applications in order to overcome the problem of oxide layer on metal-foam substrates.

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