Decreasing the Overpotential for Formate Production in Electrochemical CO2 Reduction Achieved by Anodized Sn Electrode

Morimoto Masayuki; Fujita Namiki; Takatsuji YoshiyukiHaruyama Tetsuya

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Decreasing the Overpotential for Formate Production in Electrochemical CO2 Reduction Achieved by Anodized Sn Electrode

机译：Decreasing the Overpotential for Formate Production in Electrochemical CO2 Reduction Achieved by Anodized Sn Electrode

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The Sn electrode possesses a high selectivity for formate production in electrochemical -CO2 reduction. Understanding the relationship between the selectivity of formate and surface characteristics such as structure and chemical state is important for obtaining high activity. In this study, we fabricated a porous Sn electrode using a simple method of anodization in lactic acid. The anodized electrode had numerous 1-mu m pores and its surface chemical state had a relatively high ratio of -Sn-0 compared with that of a bare Sn electrode. In the CO2 reduction reaction, the anodized Sn electrode showed a Faradaic efficiency (FE) of 35 for formate production at a low applied potential of -0.6 V vs. a reversible hydrogen electrode (RHE), with suppressed -H-2 generation. A Tafel analysis revealed that the slope of the anodized Sn electrode was 70 mV/decade, suggesting an increase in the stability of the CO2 radical anion. These results indicated that a coordinative unsaturation site such as the edge site formed by anodization contributes to a decrease in the overpotential and an increase in the reactive sites for formate production. Moreover, the surface structure appeared to be a significant factor in the production of formate at a very low applied potential relative to the surface oxidation state. Textual abstract The porous Sn electrode was prepared by anodization in lactic acid to increase the selectivity for formate at a low applied potential. Prepared porous Sn electrode enhances formate production from the CO2RR at a low applied potential due to the stabilization of the CO2 or its reaction intermediates.

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《Electrocatalysis》 |2022年第1期|72-80|共9页
作者
Morimoto Masayuki; Fujita Namiki; Takatsuji YoshiyukiHaruyama Tetsuya;
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作者单位

Kyushu Inst Technol;

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原文格式 PDF
正文语种英语
中图分类化学动力学、催化作用;
关键词
Anodization; Sn; Electrochemical reduction of CO2; Formate; CARBON-DIOXIDE; CATALYTIC-ACTIVITY; METAL-ELECTRODES; TIN ELECTRODES; COPPER; TECHNOLOGIES; SELECTIVITY; CONVERSION; METHANE; AU;

Decreasing the Overpotential for Formate Production in Electrochemical CO2 Reduction Achieved by Anodized Sn Electrode

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