Enhancement of formic acid oxidation reaction on Pd3Au/C nanocatalysts via CO-induced surface Pd enrichment

Title
Enhancement of formic acid oxidation reaction on Pd3Au/C nanocatalysts via CO-induced surface Pd enrichment
Authors
이상영박희영정남기정영훈장인준류재윤안도천박일규장종현유성종
Keywords
formic acid oxidation; nanocatalysts; CO induced; surface CO enrichment
Issue Date
2014-09
Publisher
international society of electrochemistry
Abstract
The Pd of electrode material was exhibited without adsorbed CO such as intermediate during the formic acid oxidation (direct pathway). The improved Pd-Au electrocatalyst was reported for enhance the overall performance of Pd as the promotion effect of Au1. The CO induced surface segregation is a seductive method for improvement of electrocatalytic activity due to simultaneously modification with composition of surface and electronic structure. The maximum formic acid oxidation rate depend on the Pd surface structure: Pd (100) > Pd (111) > Pd (110) which suggested by Hoshi et al2-3. We demonstrated that the structure and composition of Pd surface in Pd3Au electrocatalyst was accomplished with control for heat treatment under air, Ar, CO and CO-Ar atmosphere. The structure, electronic and composition property of bulk scale in Pd3Au catalyst was measured by X-ray analysis technique. The electrocatalyst activities were measured by electrochemical technique. The simulation of surface composition ratio was demonstrated through DFT calculation. Through Pd ratio increase at surface, The binding strength of H was progressed to do weakness above 75 %. Therefore catalytic reaction was confirmed that the reaction energetic of rate determine step (RDS) on alloy surface was increased to compared with bulk.
URI
http://pubs.kist.re.kr/handle/201004/48163
Appears in Collections:
KIST Publication > Conference Paper
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