Structurally heterogeneous electrode films of polyacrylamide and acrylamide/vinylpyridine copolymeric gels: Mediation of ascorbic acid oxidation |
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| Authors: | Juanita E. Van Koppenhagen Marcin Majda |
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| Affiliation: | Department of Chemistry, University of California, and the Center for Advanced Materials, Lawrence Berkeley Laboratory, Berkeley, Ca 94720 U.S.A. |
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| Abstract: | ![]()
The surface chemistry, i.e. adsorption and surface phase formation, on Rh, Ir, Pt and Au single-crystal electrodes in 0.5 M H2SO4 has been studied in the potential range between 0 and 4 V vs. a standard hydrogen electrode by X-ray photoelectron spectroscopy and cyclic voltammetry. Both methods gave complementary results which were interpreted as potential-dependent changes from physisorption of water to adsorption of hydroxyl groups, hydroxide film formation, and eventual growth of thick adlayers of oxyhydroxide (Rh, Ir and Au) or hydroxide (Pt) with increasing applied voltage. |
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| Keywords: | To whom correspondence should be addressed. |
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