ZnCo₂O₄表面刻蚀光催化剂的制备及其CO₂还原性能研究

Preparation and Performance of Surface-Etched ZnCo₂O₄ Photocatalysts for CO₂ Reduction

摘要: 光催化还原CO₂利用可见光能量将CO₂转化为有机化合物或可燃性气体，同时消耗掉大气中的CO₂，具有巨大的潜力应对能源和环境问题。钴酸锌(ZnCo₂O₄)因其优异的光吸收性能、适中的能带结构和良好的光电化学特性而成为研究的热点。然而，普通的ZnCo₂O₄在光催化还原CO₂方面存在一些限制，如光催化活性低并且选择性差。因此，对ZnCo₂O₄进行改性以提高其光催化性能已成为当前研究的重点。双金属氧化物材料被广泛用于改善光催化剂的性能，通过合适的界面构建增强光生载流子的分离和传输。通过探索ZnCo₂O₄的界面构建，优化光吸收性能，提高ZnCo₂O₄对可见光的利用率；增强光生电子–空穴对的分离效率，减少电子–空穴对的复合；提高CO₂的吸附和活化。

Abstract: Photocatalytic CO₂ reduction, utilizing visible light energy to convert CO₂ into organic compounds or combustible gases while consuming atmospheric CO₂, holds great potential in addressing energy and environmental issues. Zinc cobalt oxide (ZnCo₂O₄) has become a research hotspot due to its excellent light absorption properties, moderate band structure, and good photoelectrochemical characteristics. However, the performance of conventional ZnCo₂O₄ in photocatalytic CO₂ reduction is limited by factors such as low photocatalytic activity and poor selectivity. Therefore, modifying ZnCo₂O₄ to enhance its photocatalytic performance has become a key focus of current research. Bimetallic oxide materials are widely used to improve the performance of photocatalysts by constructing suitable interfaces that enhance the separation and transport of photogenerated charge carriers. By exploring the interface construction of ZnCo₂O₄, its light absorption performance can be optimized, improving ZnCo₂O₄’s utilization of visible light; the separation efficiency of photogenerated electron-hole pairs can be enhanced, reducing electron-hole recombination; and the adsorption and activation of CO₂ can be improved.