期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 554, 期 -, 页码 25-34出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-0728(03)00023-8
关键词
Pt(111); Bi adatoms; formic acid oxidation; CO formation
Formic acid oxidation has been studied on bismuth modified Pt(1 1 1) electrodes in perchloric acid media using non-rotating and hanging meniscus rotating disk (HMRD) electrodes. On unmodified Pt(1 1 1) electrodes, the voltammetric profiles are controlled simultaneously by reaction paths going through the active intermediate and the poison (CO). For the Bi-Pt(1 1 1) electrodes, high oxidation currents are always obtained and poison formation is inhibited. Using HMRD electrodes in 0.1 M HClO4+0.05 M HCOOH, full kinetic control of the active intermediate reaction path can be achieved, and no accumulation of poison was detected. The Tafel slope for this process was also calculated, resulting in a value of 120 mV. With this value, a detailed mechanism for this path can be proposed, which coincides with that found in UHV environments. (C) 2003 Published by Elsevier B.V.
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