采用沉淀法-水热法合成了电催化Bi2O3-CuO复合材料.利用X-射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等方法对样品的结构和形貌进行了研究.用电化学测试方法对材料电催化性能进行研究,用气相色谱和核磁共振氢谱对产物进行分析.电催化实验结果表明,Bi2O3-CuO复合材料的电催化性能及对甲酸盐的选择性远高于Bi2O3和CuO.其中比例为1∶1的Bi2O3-CuO复合材料性能最好,在-1.2 V vs.RHE的电位下,甲酸盐的法拉第效率为90.3％,电流密度为20 mA/cm2,测试10 h保持稳定.
Preparation of Bi2O3-CuO Composites and their Performance in Electrocatalytic Reduction of CO2
A electrocatalytic Bi2O3-CuO composite was synthesized by precipitation-hydrothermal method.The structure and morphology of the samples were studied by X-ray diffraction(XRD),Scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray photoelectron spectroscopy(XPS),et al.The electrocatalytic properties of the materials were studied by electrochemical tests,and the selectivity of the products was analyzed by gas chromatography and H1 NMR.The results of electrocatalytic experiments show that the electrocatalytic performance and selectivity of Bi2O3-CuO composites for formate are much higher than that of Bi2O3 and CuO respectively.Among them,the Bi2O3-CuO composites with the ratio of 1:1 has the best electrocatalytic properties,under the potential of-1.2 V vs.RHE,the Faraday efficiency of formate is 90.3％and the current density is 20 mA/cm2,and the test remains stable for 10 h.
Bi2O3CuOBi2O3-CuO compositesElectrocatalytic reduction of CO2Formate
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