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• W4229440103 endingPage "136878" @default.
• W4229440103 startingPage "136878" @default.
• W4229440103 abstract "• Monodispersed Pd 2 Ga nanorods are engineered as bifunctional catalysts for EOR and HER. • The coupled system allows for simultaneous production of high purity acetic acid and hydrogen. • Low voltage input of 0.62 V drives the electrolyzer at a current density of 10 mA cm −2 . • The presence of Ga tunes the electronic structure of Pd and enhances binding ability of OH – . The production of hydrogen from water splitting is hampered by the sluggish oxygen evolution reaction (OER). To overcome the OER limitation, herein we propose the electrosynthesis of value-added acetic acid from ethanol as the anodic reaction using high activity catalyts. For this strategy to be cost-effective, we develop a bifunctional catalyst based on Pd 2 Ga nanorods. Such Pd 2 Ga/C-based catalyst presents outstanding activity, selectivity and also stability for the electrocatalytic ethanol-to-acetic acid conversion with a current density above 164 mA cm −2 and a mass activity of 1.97 A mg −1 Pd . Besides, its activity for hydrogen production is comparable to that of commercial Pt/C catalysts. Using Pd 2 Ga/C as a bifunctional catalyst for both water reduction at the cathode and ethanol oxidation at the anode, these two coupled reactions are demonstrated to be an energy-efficient approach for the simultaneous production of high purity acetic acid and hydrogen. The assembled electrolyzer requires a small voltage input of 0.62 V to reach a current density of 10 mA cm −2 , much lower than that of cells based on commercial Pt/C or Pd/C catalyst. Density functional theory calculations reveal that the high performance of the coupled system relies on a combination of an electronic and bifunctional effect of Ga, reducing the hydrogen-binding energy on the Pd site and at the same time actively participating in the reaction by providing OH − binding sites and reducing the energy barrier of the ethanol oxidation rate-determining step." @default.
• W4229440103 created "2022-05-11" @default.
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• W4229440103 date "2022-10-01" @default.
• W4229440103 modified "2023-10-14" @default.
• W4229440103 title "Pd2Ga nanorods as highly active bifunctional catalysts for electrosynthesis of acetic acid coupled with hydrogen production" @default.
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• W4229440103 doi "https://doi.org/10.1016/j.cej.2022.136878" @default.
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