Electrochemical oxidation of 2-propanol over platinum and palladium electrodes in alkaline media studied by in situ attenuated total reflection infrared spectroscopy

被引：20
|
作者：
Okanishi, Takeou [1 ]
Katayama, Yu [1 ]
Ito, Ryota [1 ]
Muroyama, Hiroki [1 ]
Matsui, Toshiaki [1 ]
Eguchi, Koichi [1 ]
机构：
[1] Kyoto Univ, Grad Sch Engn, Dept Energy & Hydrocarbon Chem, Nishikyo Ku, Kyoto 6158510, Japan
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2016年 / 18卷 / 15期
关键词：
ALCOHOL FUEL-CELLS; TIME FTIR SPECTROSCOPY; ABSORPTION SPECTROSCOPY; ETHANOL ELECTROOXIDATION; CARBON-MONOXIDE; PD ELECTRODE; METHANOL; ACID; ISOPROPANOL; CATALYSTS;
D O I：
10.1039/c5cp07518a
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The electrochemical oxidation of 2-propanol over Pt and Pd electrodes was evaluated in alkaline media. Linear sweep voltammograms (LSVs), chronoamperograms (CAs), and simultaneous time-resolved attenuated total reflection infrared (ATR-IR) spectra of both electrodes were obtained in a 0.25 M KOH solution containing 1 M 2-propanol. The onset potential of 2-propanol oxidation for Pt was lower than that for Pd in LSVs while the degree of performance degradation observed for Pd was significantly smaller than that observed for Pt in CAs. The main product of 2-propanol oxidation was acetone over both electrodes and, over Pt only, acetone produced was catalytically oxidized to the enolate ion, which was accumulated on the Pt surface, leading to significant performance degradation. Carbon dioxide and carbonate species (CO32-, HCO3-) were not observed during 2-propanol oxidation over both electrodes, indicating that the complete oxidation of 2-propanol to CO2 will be a minor reaction.
引用
收藏
页码：10109 / 10115
页数：7
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