Cu2O/CuO/Cu电极光电催化还原CO2

Photoelectrocatalytic Reduction of CO2 on Cu2O/CuO Film

摘要:

本文以铜片为催化材料的载体，采用表面氧化法制备CuO纳米带（CuO NRs），然后用电化学法将Cu2O沉积到CuO NRs上，得到复合电极Cu2O/CuO/Cu。借助X射线衍射（XRD）、透射电子显微镜（TEM）对Cu2O/CuO/Cu复合电极的结构进行了表征。通过线性扫描伏安法（LSV）、光电流-时间测试、电化学阻抗测试对Cu2O/CuO/Cu复合电极光电催化CO2性能进行了研究。借助变色酸分光光度法来测定CO2光电还原产物。结果表明：氧化铜在铜基底上呈纳米带生长；复合电极Cu2O/CuO/Cu对CO2有较强的光响应，表现出优异的光电催化性能；Cu2O/CuO/Cu复合电极光电催化还原CO2的主要产物是甲醇，6h后甲醇的含量为32.2μg/mL。该研究对高效光电催化还原CO2有一定的指导意义。

Abstract:

In this study, the Cu2O/CuO/Cu complex films were prepared with the copper plate as the carrier of catalyst. First, the CuO nanoribbons (CuO NRs) were developed on the copper plate by the surface oxidation method. And then the Cu2O was loaded on the CuO NRs by electrochemical methods. X-ray diffraction (XRD) and transmission electron microscope (TEM) were carried out to characterize complex films. Linear sweep voltammetry, photocurrent-time measurement and electrochemical impedance spectroscopy were used to study the photoelectrocatalytic reduction performance for CO2. The reduction product of CO2 was determined by chromotropic acid spectrophotometry method. The results showed that the CuO films were composed with nanoribbons and the Cu2O/CuO/Cu complex films had excellent photoelectrocatalytic performance. Methanol was the major product of the photoelectrocatalytic reduction of CO2 and its concentration reached 32.2μg/mL after 6h. This study has some guidance for photoelectrocatalytic CO2 reduction.