A novel Ni-Cu/ZnO@MWCNT anode employed in urea fuel cell to attain superior performances
- Authors
- Basumatary, Padmini; Konwar, Dimpul; Yoon, Young Soo
- Issue Date
- 20-Jan-2018
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Electrocatalyst; Ni-Cu alloy; ZnO@MWCNT; Urea; Current density
- Citation
- ELECTROCHIMICA ACTA, v.261, pp.78 - 85
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 261
- Start Page
- 78
- End Page
- 85
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/4155
- DOI
- 10.1016/j.electacta.2017.12.123
- ISSN
- 0013-4686
- Abstract
- Ni-Cu alloy nanoparticles loaded onto ZnO- coated multi-walled carbon nanotubes (MWCNTs) were evaluated as anode catalysts in direct urea fuel cells. The Ni-Cu/ZnO@MWCNT catalyst was synthesized by a two-step hydrothermal process. Uniform distribution of the spherical Ni-Cu alloy nanoparticles on the ZnO@MWCNT surface was realized, as ascertained by scanning electron microscope and transmission electron microscope. A Ni-Cu/MWCNT catalyst was also prepared and evaluated to examine the effect of the ZnO coating on the electrocatalytic activity of Ni-Cu/ZnO@MWCNT. Cyclic voltammetry of the Ni-Cu/ZnO@MWCNT catalyst exhibited a peak current density of 30.02 mA cm(-2) at 0.38 V (vs. Ag/AgCl) with a low onset potential in an aqueous solution of 0.4 M KOH/0.07M urea. The Ni-Cu/ZnO@MWCNT catalyst exhibited superior catalytic activity for urea electro-oxidation than Ni-Cu/MWCNT, owing to the electronic interaction between its different components, viz, Ni, Cu, and ZnO@MWCNT. A unit cell based on the Ni-Cu/ZnO@MWCNT anode exhibited peak power densities of 26.9 and 44.36 mW cm(-2) at 20 and 50 degrees C, respectively, in 3 M KOH/0.70M urea fuel. (c) 2017 Elsevier Ltd. All rights reserved.
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