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Adsorption and absorption of hydrogen species on silver electrode in alkaline solution

Jafarian, M ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. Publisher: 2003
  3. Abstract:
  4. The processes of adsorption and absorption of H atoms on silver electrode in alkaline media has been studied using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The potential range in the CV studies has been between -0.1 and -1.6 V /Ag-AgCl. In the first cycle, two cathodic and three anodic peaks have been observed. The H atom electrosorption current peak at ca. -0.6 V/Ag-AgCl, which appears at second cycle, is assigned to hydrogen absorption states. Nyquist plots consist of two overlapping semi-circles of variable diameters depending on the extent of the cathodic dc-potential offset. Hydrogen absorption occurs simultaneously with the hydrogen evolution reaction and competes with it. The H atoms are converted to H2 rather than being sorbed into the polycrystalline Ag when the potential is more negative. These H atoms in the bulk of Ag electrode can be removed only by heating the electrode on flame
  5. Keywords:
  7. Source: Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry ; Volume 42, Issue 3 , 2003 , Pages 516-519 ; 03764710 (ISSN)
  8. URL: http://nopr.niscpr.res.in/bitstream/123456789/20605/1/IJCA%2042A%283%29%20516-519.pdf