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Copper–Silver Bimetallic Nanowire Arrays for Electrochemical Reduction of Carbon Dioxide

机译:铜-银双金属纳米线阵列用于电化学还原二氧化碳

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摘要

The electrochemical conversion of carbon dioxide (CO2) into gaseous or liquid fuels has the potential to store renewable energies and reduce carbon emissions. Here, we report a three-step synthesis using Cu–Ag bimetallic nanowire arrays as catalysts for electrochemical reduction of CO2. CuO/Cu2O nanowires were first grown by thermal oxidation of copper mesh in ambient air and then reduced by annealing in the presence of hydrogen to form Cu nanowires. Cu–Ag bimetallic nanowires were then produced via galvanic replacement between Cu nanowires and the Ag+ precursor. The Cu–Ag nanowires showed enhanced catalytic performance over Cu nanowires for electrochemical reduction of CO2, which could be ascribed to the incorporation of Ag into Cu nanowires leading to suppression of hydrogen evolution. Our work provides a method for tuning the selectivity of copper nanocatalysts for CO2 reduction by controlling their composition.
机译:二氧化碳(CO2)电化学转化为气态或液态燃料具有储存可再生能源和减少碳排放的潜力。在这里,我们报告了使用Cu-Ag双金属纳米线阵列作为电化学还原CO2的催化剂的三步合成。首先通过在环境空气中对铜网进行热氧化来生长CuO / Cu2O纳米线,然后通过在氢的存在下退火将其还原以形成Cu纳米线。然后,通过在Cu纳米线和Ag + 前驱体之间进行电流置换来生产Cu-Ag双金属纳米线。 Cu-Ag纳米线在电化学还原CO2方面表现出比Cu纳米线更高的催化性能,这可能归因于将Ag掺入Cu纳米线中,从而抑制了氢的释放。我们的工作提供了一种通过控制铜纳米催化剂的组成来调节其对CO2还原的选择性的方法。

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