The origin of high activity of Pt–Au surfaces in the formic acid oxidation
作者： Maja D. Obradović , Amalija V. Tripković , Snežana Lj. Gojković
DOI: 10.1016/J.ELECTACTA.2009.08.038
关键词:
摘要: Abstract We have investigated the oxidation of HCOOH on Au-modified Pt (Au@Pt) and Pt-modified Au (Pt@Au) electrodes to establish role ensemble electronic effect in catalysis this reaction. The surfaces were modified by electrodeposition sub-monolayers. Cyclic voltammetry supporting electrolyte CO ads stripping shown that Pt–Au interactions are insignificant Au@Pt, but considerable Pt@Au. Oxidation Au@Pt commenced at same potentials as bare Pt, whereas Pt@Au was delayed for ∼0.2 V. Both types found be more active toward compared exhibiting maximum activity fraction between 0.15 0.25 with enhancement factor than two orders magnitude. On bimetallic amount formed dehydration low decreased decreasing fraction. It concluded high is caused increased selectivity dehydrogenation. Similar behavior oxidation, regardless interactions, leads conclusion plays dominant oxidation.
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