Pt-Based Catalysts for Electrochemical Oxidation of Ethanol

Marinkovic, Nebojsa S.; Li, Meng; Adzic, Radoslav R.

doi:10.1007/s41061-019-0236-5

Title: Pt-Based Catalysts for Electrochemical Oxidation of Ethanol

Journal Article · Thu Apr 04 00:00:00 EDT 2019 · Topics in Current Chemistry

DOI:https://doi.org/10.1007/s41061-019-0236-5· OSTI ID:1569547

^[1]; Li, Meng ^[2]; Adzic, Radoslav R. ^[2]

Columbia Univ., New York, NY (United States). Synchrotron Catalysis Consortium
Brookhaven National Lab. (BNL), Upton, NY (United States)

Despite its attractive features as a power source for direct alcohol fuel cells, utilization of ethanol is still hampered by both fundamental and technical challenges. The rationale behind the slow and incomplete ethanol oxidation reaction (EOR) with low selectivity towards CO₂ on most Pt-based catalysts is still far from being understood, and a number of practical problems need to be addressed before an efficient and low-cost catalyst is designed. Some recent achievements towards solving these problems are presented. Pt film electrodes and Pt monolayer (Pt_ML) electrodes on various single crystal substrates showed that EOR follows the partial oxidation pathway without C–C bond cleavage, with acetic acid and acetaldehyde as the final products. The role of the substrate lattice on the catalytic properties of Pt_ML was proven by the choice of appropriate M(111) structure (M = Pd, Ir, Rh, Ru and Au) showing enhanced kinetics when PtML is under tensile strain on Au(111) electrode. Nanostructured electrocatalysts containing Pt–Rh solid solution on SnO₂ and Pt monolayer on non-noble metals are shown, optimized, and characterized by in situ methods. Electrochemical, in situ Fourier transform infrared (FTIR) and X-ray absorption spectroscopy (XAS) techniques highlighted the effect of Rh in facilitating C–C bond splitting in the ternary PtRh/SnO₂ catalyst. In situ FTIR proved quantitatively the enhancement in the total oxidation pathway to CO₂, and in situ XAS confirmed that Pt and Rh form a solid solution that remains in metallic form through a wide range of potentials due to the presence of SnO₂. Combination of these findings with density functional theory calculations revealed the EOR reaction pathway and the role of each constituent of the ternary PtRh/SnO₂ catalyst. The optimal Pt:Rh:Sn atomic ratio was found by the two in situ techniques. Attempts to replace Rh with cost-effective alternatives for commercially viable catalysts has shown that Ir can also split the C–C bond in ethanol, but the performance of optimized Pt–Rh–SnO2 is still higher than that of the Pt–Ir–SnO₂ catalyst.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; SC0012335

OSTI ID:: 1569547

Report Number(s):: BNL-212165-2019-JAAM

Journal Information:: Topics in Current Chemistry, Vol. 377, Issue 3; ISSN 2365-0869

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
Platinum-based catalysts
ethanol oxidation
in situ FTIR
in situ EXAFS

Title: Pt-Based Catalysts for Electrochemical Oxidation of Ethanol

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