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The effects of cations and anions on hydrogen chemisorption at PtExperimental evidence based on linear sweep voltammetry is presented to substantiate the view that ionic adsorption substantially shifts electrode potentials in addition to the relative heights of the hydrogen adsorption peaks. HClO4 and HF are chosen as better reference electrolytes for anion studies. The voltammetry curves for 0.1M HF and 0.1M HClO4 as well as the effect of adding successively increasing amounts of H2SO4 to these electrolytes are discussed. The measurements are also extended to alkaline solutions. Mechanisms whereby the addition of various cations and anions to electrolytes such as HF and HClO4 can induce changes in the structure of the hydrogen adsorption region in the voltammetry curves are identified: (1) blocking of sites by anion adsorption and coupling of hydrogen adsorption and anion desorption, (2) modification in the hydrogen adsorption energies for sites adjacent to adsorbed anions, (3) changes in the potential distribution across the interface, and (4) surface restructuring.
Document ID
19780029189
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Huang, J. C.
(Case Western Reserve Univ. Cleveland, OH, United States)
Ogrady, W. E.
(Case Western Reserve Univ. Cleveland, OH, United States)
Yeager, E.
(Case-Western-Reserve University Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
November 1, 1977
Publication Information
Publication: Electrochemical Society
Subject Category
Inorganic And Physical Chemistry
Accession Number
78A13098
Distribution Limits
Public
Copyright
Other

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