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论文类型：期刊论文

发表时间：2010-09-30

发表刊物：JOURNAL OF CATALYSIS

收录刊物：SCIE、EI、Scopus

卷号：275

期号：1

页面范围：34-44

ISSN号：0021-9517

关键字：Methanol electro-oxidation; Electrocatalysis; Platinum catalyst; Hydrous ruthenium oxide; Catalyst promoter

摘要：Pt-(RuO(x)H(y))(m) electrocatalysts (m being the atomic Ru/Pt ratio) supported on multi-walled carbon nanotubes, in which amorphous hydrous ruthenium oxide (RuO(x)H(y)) is the exclusive Ru-containing species, were prepared and comprehensively characterized by X-ray diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction, thermogravimetric analysis and transmission electron microscopy techniques. Cyclic voltammetry (CV) and chronoamperometry studies of CO stripping and methanol electro-oxidation indicated that the CO tolerance and catalytic activity of Pt improved remarkably by the co-presence of RuO(x)H(y). Repeated CV pretreatments in 0.5 M H(2)SO(4) up to potentials higher than 0.46 V (vs. SCE) induced significant dissolution of RuO(x)H(y), which changed the RuO(x)H(y) content, Pt-RuO(x)H(y) proximity and surface structure of Pt, and consequently altered the electrocatalytic activity of Pt in the final electrode. However, RuO(x)H(y) dissolution was not identified when the pretreatment potentials was set no higher than 0.46 V. Discussion on the promotional function of RuO(x)H(y) was made based on the peculiarity of RuO(x)H(y) as a mixed electron/proton conductor. (C) 2010 Elsevier Inc. All rights reserved.