期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 123, 期 1, 页码 426-432出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b08547
关键词
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资金
- Young Investigator Award of Army Research Office [W911 NF-15-1-0123]
- Johns Hopkins University
Glycerol, a surplus byproduct of biodiesel production, is a promising energy source for fuel cells. However, the low selectivity toward the complete-oxidation product, carbon dioxide (CO2), hinders the electro-oxidation of glycerol. In this work, we combine spectro-electrochemical studies of extended surfaces using sum frequency generation and product-resolved electrocatalytic measurements on high surface-area catalysts under potentiostatic conditions to investigate the glycerol oxidation reaction on platinum (Pt). We observed adsorbing carbon monoxide (CO) as the reaction intermediate at potentials as low as 0.05 V (vs the reversible hydrogen electrode; the same potential scale is used throughout this discussion unless otherwise specified) on polycrystalline Pt electrode, indicating that cleavage of the C-C bond in glycerol is feasible on Pt. This observation is in contradiction to the low selectivity toward CO, (with a faradaic efficiency of <4%) measured by the electrocatalytic studies on Pt/C. The discrepancy is ascribed to the rather feasible cleavage of one terminal carbon to form *CO, but kinetically hindered oxidation of *CO and further dissociation of the remaining C-2 fragments at low potentials, whereas at high potentials partial oxidation pathways become more favorable due to suppressed C-C bond cleavage.
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