Bi_(2)O_(3)-CuO复合材料的制备及其电催化还原CO_(2)性能研究

Preparation of Bi_(2)O_(3)-CuO Composites and their Performance in Electrocatalytic Reduction of CO_(2)

采用沉淀法-水热法合成了电催化Bi_(2)O_(3)-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,Bi_(2)O_(3)-CuO复合材料的电催化性能及对甲酸盐的选择性远高于Bi_(2)O_(3)和CuO.其中比例为1∶1的Bi_(2)O_(3)-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/cm^(2),测试10 h保持稳定.

A electrocatalytic Bi_(2)O_(3)-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 H^(1) NMR.The results of electrocatalytic experiments show that the electrocatalytic performance and selectivity of Bi_(2)O_(3)-CuO composites for formate are much higher than that of Bi_(2)O_(3) and CuO respectively.Among them,the Bi_(2)O_(3)-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/cm^(2),and the test remains stable for 10 h.