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Catalysts 2017, 7(9), 246; doi:10.3390/catal7090246

Ethanol Oxidation Reaction on Tandem Pt/Rh/SnOx Catalyst

Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
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Received: 18 July 2017 / Revised: 12 August 2017 / Accepted: 20 August 2017 / Published: 24 August 2017
(This article belongs to the Special Issue Advances in Electrocatalysis)
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Abstract

To elucidate the atomic arrangement of a Pt-Rh-Sn ternary catalyst with a high catalytic activity for ethanol oxidation reaction (EOR) and high CO2 selectivity, we prepared a tandem Pt/Rh/SnOx, in which a Rh adlayer was deposited on a Pt substrate (Rh coverage: 0.28), followed by depositing several layers of SnOx only on the Rh surface (Sn coverage: 0.07). For reference, Sn was randomly deposited on the Rh-modified Pt (Pt/Rh) electrode whose Rh and Sn coverages were 0.22 and 0.36 (random Pt/Rh/SnOx). X-ray photoelectron spectroscopy demonstrated that Pt and Rh were metallic, and Sn was largely oxidized. Both Pt/Rh/SnOx electrodes were less positive in onset potential of EOR current density and higher in EOR current density than Pt and Rh/Pt electrodes. In situ infrared reflection-absorption spectroscopy demonstrated that the tandem Pt/Rh/SnOx electrode did not produce acetic acid, but produced CO2 in contrast to the random Pt/Rh/SnOx, suggesting that a tandem arrangement of Pt, Rh and SnOx, in which the Pt and SnOx sites were separated by the Rh sites, was effective for selective CO2 production. In the electrostatic electrolysis at 0.5 V vs. RHE, the tandem Pt/Rh/SnOx electrode exhibited higher EOR current density than the Pt and Pt/Rh electrodes after 1.5 h. View Full-Text
Keywords: ethanol oxidation reaction; direct ethanol fuel cell; tandem catalyst; Pt/Rh/SnOx; infrared reflection-absorption spectroscopy; selective CO2 production ethanol oxidation reaction; direct ethanol fuel cell; tandem catalyst; Pt/Rh/SnOx; infrared reflection-absorption spectroscopy; selective CO2 production
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MDPI and ACS Style

Mai, P.T.; Haze, A.; Chiku, M.; Higuchi, E.; Inoue, H. Ethanol Oxidation Reaction on Tandem Pt/Rh/SnOx Catalyst. Catalysts 2017, 7, 246.

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