Abstract

The electroreduction of CO₂ to valuable chemicals and fuels offers an effective mean for energy storage. Although CO₂ has been efficiently converted into C₁ products (e.g., carbon monoxide, formic acid, methane and methanol), its convention into high value-added multicarbon hydrocarbons with high selectivity and activity still remains challenging. Here we demonstrate the formation of multi-shelled CuO microboxes for the efficient and selective electrocatalytic CO₂ reduction to C₂H₄. Such a structure favors the accessibility of catalytically active sites, improves adsorption of reaction intermediate (CO), inhibits the diffusion of produced OH⁻ and promotes C—C coupling reaction. Owing to these unique advantages, the multi-shelled CuO microboxes can effectively convert CO₂ into C₂H₄ with a maximum faradaic efficiency of 51.3% in 0.1 M K₂SO₄. This work provides an effective way to improve CO₂ reduction efficiency via constructing micro- and nanostructures of electrocatalysts.

中文翻译：

---

用于将二氧化碳还原为乙烯的多壳CuO微箱

摘要

将CO ₂电还原为有价值的化学品和燃料提供了一种有效的储能手段。尽管已将CO ₂有效地转化为C ₁产物（例如，一氧化碳，甲酸，甲烷和甲醇），但是将其常规转化为具有高选择性和活性的高附加值多碳氢化合物仍然具有挑战性。在这里，我们展示了多壳CuO微箱的形成，可用于将CO ₂有效和选择性地电催化还原为C ₂ H ₄。这样的结构有利于催化活性位点的可接近性，提高了反应中间体（CO）的吸附，抑制所产生的扩散OH ^-并促进CC偶联反应。由于这些独特的优势，多壳CuO微箱可以有效地将CO ₂转化为C ₂ H ₄，在0.1 MK ₂ SO _4中的最大法拉第效率为51.3％。这项工作为通过构建电催化剂的微观和纳米结构提供了一种提高CO ₂还原效率的有效途径。