A kinetic study on the electrodeposition of nickel nanostructure and its electrocatalytic activity for hydrogen evolution reaction

Torabi, M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1007/s10800-010-0170-2
  3. Publisher: 2010
  4. Abstract:
  5. The electrodeposition of nickel was studied using electrochemical techniques in different electrolytes and various agents. The voltammetry analysis clearly showed that the electrodeposition of nickel was a diffusion-controlled process associated with a typical nucleation process. The current transients represented instantaneous nucleation with a typical three-dimensional (3D) growth mechanism. Scharifker's equations were derived for instantaneous and progressive nucleation of the 3D growth of the spherical centers under diffusion-controlled condition. The number of nucleation sites increased with the increment in overpotential and Ni 2+ concentration. Atomic force microscopy was used to confirm the presumed model. Also, the electrocatalytic activities of the Ni films were investigated for hydrogen evolution reaction (HER). The electrocatalytic activity of the Ni nanostructure was three times higher than the 2D Ni microstructure when the overpotential of -1.2 V was applied. The HER current density at -1.4 V for Ni nanostructure (-20 mA cm -2) was considerable with respect to the Ni microstructure (-8.46 mA cm -2) too
  6. Keywords:
  7. Kinetic ; 3-D growth ; Controlled conditions ; Current transients ; Diffusion-controlled process ; Electrocatalytic activity ; Electrochemical techniques ; Hydrogen evolution reactions ; Kinetic study ; Ni films ; Ni microstructure ; Nucleation process ; Nucleation sites ; Overpotential ; Progressive nucleation ; Three dimensional (3D) growth ; Atomic force microscopy ; Catalyst activity ; Electrochemical sensors ; Electrodeposition ; Hydrogen ; Microstructure ; Nanostructures ; Nickel ; Nucleation ; Thin films ; Three dimensional ; Process control
  8. Source: Journal of Applied Electrochemistry ; Volume 40, Issue 11 , November , 2010 , Pages 1941-1947 ; 0021891X (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10800-010-0170-2