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Electrodeposited Cu-Sn Alloy for Electrochemical CO2 Reduction to CO/HCOO-

机译：电化沉积Cu-Sn合金用于电化学二氧化碳还原到CO / HCOO-

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摘要

Cu-Sn alloy electrodes were prepared by simple electrodeposition method for the electrochemical reduction of CO2 into CO and HCOO-. The alloy electrode surfaces provided good selectivity and efficiency in electrochemical CO2 conversion because they provided appropriate binding energies between the metal and the reactive species obtained through CO2 reduction. Therefore, product selectivity can be modulated by altering the Cu-Sn crystal structure of the electrode. Using the Cu-Sn alloy electrodes, electrochemical reduction was performed at applied potentials ranging from - 0.69 to - 1.09 V vs. reversible hydrogen electrode (RHE). During electrochemical CO2 reduction, all the prepared Cu-Sn alloy electrodes showed prominent suppression of hydrogen evolution. In contrast, Cu87Sn13 has high selectivity for CO formation at all the applied potentials, with maximum faradaic efficiency (FE) of 60% for CO at - 0.99 V vs. RHE. On the other hand, Cu55Sn45 obtained a similar selectivity for electrodeposition of Sn, with FE of 90% at - 1.09 V vs. RHE. Surface characterization results showed that the crystal structure of Cu87Sn13 comprised solid solutions that play an important role in increasing the selectivity for CO formation. Additionally, it suggests that the selectivity for HCOO- formation is affected by the surface oxidation state of Sn rather than by crystal structures like intermetallic compounds.
机译：通过简单的电沉积方法制备Cu-Sn合金电极，用于将CO2的电化学还原成CO和HCOO-。合金电极表面在电化学CO2转化中提供了良好的选择性和效率，因为它们在金属和通过CO 2减少获得的反应性物质之间提供了适当的结合能量。因此，可以通过改变电极的Cu-Sn晶体结构来调制产品选择性。使用Cu-Sn合金电极，在从-0.69至-1.09V与可逆氢电极（RHE）的施加电位下进行电化学还原。在电化学二氧化碳还原过程中，所有制备的Cu-Sn合金电极显示出突出的氢化抑制。相反，Cu87SN13在所有施加的电位中具有高选择性的CO形成，具有60％的最高载载效率（Fe），用于CO at-0.99 V与Rhe。另一方面，Cu55SN45得到了Sn电沉积的类似选择性，Fe在-1.09V与rhe中的Fe为90％。表面表征结果表明，Cu87SN13的晶体结构包括在增加CO形成的选择性方面发挥着重要作用的固溶体。另外，它表明，HCOO-形成的选择性受到SN的表面氧化状态而不是通过金属间化合物等晶体结构的影响。

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