期刊
ESCIENCE
卷 2, 期 1, 页码 87-94出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.esci.2022.02.001
关键词
Methanol; Electro-oxidation; Formate; Oxides; Perovskite
资金
- National Research Foundation, Prime Minister's Office, Singapore, under its Campus for Research Excellence and Technological Enterprise (CREATE) program
- Singapore Ministry of Education Tier 1 grant [2019-T1-002-125]
- Singapore Ministry of Education Tier 2 grant [MOE-T2EP10220-0001]
The study investigates formate production from methanol electro-oxidation catalyzed by iron-substituted lanthanum cobaltite. The Fe/Co ratio in the oxides significantly affects the activity and selectivity, with LaCo0.5Fe0.5O3 showing the highest formate production rate.
Electrochemically producing formate by oxidizing methanol is a promising way to add value to methanol. Noble metal-based electrocatalysts, which have been extensively studied for the methanol oxidation reaction, can catalyze the complete oxidation of methanol to carbon dioxide, but not the mild oxidation to formate. As a result, exploring efficient and earth-abundant electrocatalysts for formate production from methanol is of interest. Herein, we present the electro-oxidation of methanol to formate, catalyzed by iron-substituted lanthanum cobaltite (LaCo1-xFexO3). The Fe/Co ratio in the oxides greatly influences the activity and selectivity. This effect is attributed to the higher affinity of Fe and Co to the two reactants: CH3OH and OH-, respectively. Because a balance between these affinities is favored, LaCo0.5Fe0.5O3 shows the highest formate production rate, at 24.5 mmol h-1 gox-1ide, and a relatively high Faradaic efficiency of 44.4% in a series of (LaCo1-xFexO3) samples (x = 0.00, 0.25, 0.50, 0.75, 1.00) at 1.6 V versus a reversible hydrogen electrode.
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