Enhancement of formic acid oxidation reaction on Pd3Au/C nanocatalysts via CO-induced surface Pd enrichment
- Enhancement of formic acid oxidation reaction on Pd3Au/C nanocatalysts via CO-induced surface Pd enrichment
- 이상영; 박희영; 정남기; 정영훈; 장인준; 류재윤; 안도천; 박일규; 장종현; 유성종
- formic acid oxidation; nanocatalysts; CO induced; surface CO enrichment
- Issue Date
- international society of electrochemistry
- 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.
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