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Highly dispersed and COad-tolerant Ptshell-Pdcore catalyst for ethanol oxidation reaction: Catalytic activity and long-term durability.

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Title: Highly dispersed and COad-tolerant Ptshell-Pdcore catalyst for ethanol oxidation reaction: Catalytic activity and long-term durability.
Authors: Choi, Insoo1 ischoi@kangwon.ac.kr, Lim, Dong-Hee2, Shin, Dong Yun2
Source: International Journal of Hydrogen Energy. Jun2018, Vol. 43 Issue 24, p11335-11344. 10p.
Subjects: Platinum catalysts, Catalytic activity, Ethanol, Carbon monoxide, Durability, Electrochemical analysis
Abstract: Highly dispersed Pt shell -Pd core catalyst is synthesized via an electroless deposition and a galvanic displacement. From electrochemical analysis, the catalyst is confirmed to be active toward an ethanol oxidation reaction for a prolonged time, and is more resistive against CO ad -poisoning than a conventional Pt/C catalyst. The stable activity of Pt shell -Pd core /C is ascribed to the modified electronic property of Pt over-layer, which leads to a weak CO-adsorption strength with a high affinity for OH. The weakened binding property of surface Pt with CO ad was experimentally confirmed by conducting a CO ad -stripping and by measuring an electrochemically active surface area of the catalyst over multiple cycles. The CO ad oxidation ability of as-synthesized catalyst is further proved by a computational method via density functional theory (DFT) calculation. The result presents a potential application of the catalyst for the efficient ethanol oxidation in a direct ethanol fuel cell. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Highly dispersed Pt shell -Pd core catalyst is synthesized via an electroless deposition and a galvanic displacement. From electrochemical analysis, the catalyst is confirmed to be active toward an ethanol oxidation reaction for a prolonged time, and is more resistive against CO ad -poisoning than a conventional Pt/C catalyst. The stable activity of Pt shell -Pd core /C is ascribed to the modified electronic property of Pt over-layer, which leads to a weak CO-adsorption strength with a high affinity for OH. The weakened binding property of surface Pt with CO ad was experimentally confirmed by conducting a CO ad -stripping and by measuring an electrochemically active surface area of the catalyst over multiple cycles. The CO ad oxidation ability of as-synthesized catalyst is further proved by a computational method via density functional theory (DFT) calculation. The result presents a potential application of the catalyst for the efficient ethanol oxidation in a direct ethanol fuel cell. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2018.03.022