Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 150, Issue 1, Pages E39-E46Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1525270
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The electrocatalytic activity of selenium-, and sulfur-modified polycrystalline Pt electrodes for O-2 reduction in acid media has been examined using rotating ring-disk electrode techniques. The results obtained indicated that, within a rather narrow range of coverages, both Se-, and S-modified Pt surfaces promote O-2 reduction via a two-electron pathway to yield hydrogen peroxide at close to 100% faradaic efficiency over a wide potential region. Also presented in this work is an experimental procedure for Se- modification of high area, unsupported Pt particles based on fluidized packed bed reactor principles. Such a strategy could be readily scaled up opening new prospects for the development of large scale hydrogen peroxide generation in acid media, including electrochemically based, room temperature, Nafion-based oxygen concentrators. (C) 2002 The Electrochemical Society.
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