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C3 -alcohols can theoretically provide high current efficiencies in direct fuel cell applications because of their intrinsically large energy densities. However, during realistic reactions, molecular multiple carbon–carbon (C C C) bonds are hardly broken, severely reducing current efficiencies. Herein, directly with commercial Pt/C as the catalyst, the operation of co-fueling with formic acid significantly enhances the current efficiencies of two types of C 3-alcohols, namely, isopropanol and 1,2-propanediol. Compared with the current densities of pure C3-alcohols, those of co-fueled C3-alcohols increase maximally by 9.9 times. The reason lies in the fact that the co-fueling design facilitates the breaking of C C C bonds, as elucidated by charge distributions that are obtained via electrochemical nuclear magnetic resonance analyses. Density-functional-theory computational results indicate that the generation of OH groups adsorbed on Pt surfaces is promoted in co-fueling experiments, reducing energy barriers for breaking progress. The co-fueling strategy is capable of optimizing C3-alcohol electrooxidations in direct fuel cells and deserves extensive study. |
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