Lee, Sang-Young Jung, Namgee Cho, Jinwon Park, Hee-Young Ryu, Jaeyune Jang, Injoon Kim, Hyoung-Juhn Cho, EunAe Park, Yeung-Ho Ham, Hyung Chul Jang, Jong Hyun Yoo, Sung Jong 2024-01-20T09:04:36Z 2024-01-20T09:04:36Z 2021-09-05 2014-08 2155-5435 https://pubs.kist.re.kr/handle/201004/126524 Carbon-supported Pd3Au nanoparticle catalysts were synthesized via chemical reduction. Surface segregation of Pd in Pd3Au catalyst was achieved via heat treatment under air, Ar, CO-Ar, and CO atmospheres, in order to obtain a surface with changed structures and composition. The surface composition was analyzed by electrochemical methods, and the Pd surface composition was observed to increase from 67.2% (air (asp) sample) to 80.6% (CO sample) after heat treatment under a CO atmosphere. The CO-induced surface segregation of the Pd3Au electrocatalyst resulted in a significantly improved formic acid oxidation (from 6.93 to 18.11 mA cm(-2)) and stability (from 0.66 to 2.01 mA cm(-2)) compared to the sample prepared in air, as well as increased mass activity (from 199.20 to 520.55 A g(-1)), electrochemical surface area (ESA(Pd)) (from 61.08 to 95.68 m(2) g(Pd)(-1)), and specific activity (from 0.33 to 0.55 mA cm(Pd)(-1)), respectively. The electrochemical activities were significantly increased because of changes in the structure and composition of the surface due to the increased surface ratio of Pd promoted by CO heat treatment. The exchange of Pd and Au atoms between the surface and the bulk material was observed to influence formic acid oxidation and stable performance. The CO-induced surface segregation has the potential to greatly enhance the electrochemical activities and surface control of Pd-Au alloy nanoparticle with lower Pd contents. English AMER CHEMICAL SOC SINGLE-CRYSTAL ELECTRODES METHANOL SYNTHESIS PD ELECTROOXIDATION CATALYST PALLADIUM PLATINUM NANOPARTICLES GOLD DECOMPOSITION Surface-Rearranged Pd3Au/C Nanocatalysts by Using CO-Induced Segregation for Formic Acid Oxidation Reactions Article 10.1021/cs500227j 1 ACS CATALYSIS, v.4, no.8, pp.2402 - 2408 ACS CATALYSIS 4 8 2402 2408 scie scopus 000339983800001 2-s2.0-84905457072 Chemistry, Physical Chemistry Article SINGLE-CRYSTAL ELECTRODES METHANOL SYNTHESIS PD ELECTROOXIDATION CATALYST PALLADIUM PLATINUM NANOPARTICLES GOLD DECOMPOSITION formic acid oxidation surface rearrange Pd-Au alloy nanocatalysts CO-induced segregation