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- W4313254811 abstract "Direct formic acid (FA) fuel cells (DFAFCs) with Pd anode catalysts are promising for small portable applications. During the electrooxidation of formic acid (FAO), CO accumulates on the Pd electrocatalyst, thereby decreasing its performance. In this work, we use density functional theory (DFT; RPBE) to elucidate the significance of coverage effects on the structure–sensitivity of FAO over four low–index Pd surfaces: Pd(1 1 1), Pd(1 0 0), Pd(1 1 0), and Pd(2 1 1). We construct coverage–dependent Gibbs free energy diagrams and in agreement with experiment, predict that Pd(1 0 0) and Pd(2 1 1) are the most active surfaces. Additionally, we find that the presence of CO spectator species can alter the preferred electrooxidation pathway under different applied potentials. Such pathway transitions appear to be critical for rationalizing experimental trends regarding electrocatalytic activity and are only captured when coverage effects are accounted for. Insights derived from this work may facilitate the design of improved FAO electrocatalysts." @default.
- W4313254811 created "2023-01-06" @default.
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- W4313254811 date "2023-01-01" @default.
- W4313254811 modified "2023-09-23" @default.
- W4313254811 title "The role of coverage effects on the structure–sensitivity of formic acid electrooxidation on Pd surfaces" @default.
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- W4313254811 doi "https://doi.org/10.1016/j.jcat.2022.12.025" @default.
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