电镀制备铟-锡合金电极及其电还原二氧化碳性能

摘要

An In-Sn alloy electrode applied to the electroreduction of CO2 to formic acid was prepared from a sulfate plating bath using copper mesh as substrate.The plating bath formulation was selected and optimized by orthogonal test.The optimal process conditions for preparation of In-Sn alloy electrode are as follows:In2(SO4)350 g/L,SnSO430 g/L,citric acid 40 g/L,additive TSNA 4 g/L,stabilizer 3 g/L,temperature 25 ℃,pH ca.1.5,and current density 1.5 A/dm2.The In-Sn alloy coating prepared under the optimal conditions is homogeneous and white and has good adhesion to the substrate.The current efficiency for electroreduction of CO2 forming formic acid using In-Sn alloy as electrode reaches 71％.The In-Sn alloy electrode has good stability.%以腐蚀铜网为基体,在硫酸盐镀液中制备得到用于电还原CO2的铟-锡合金电极.对镀液配方进行了筛选,并通过正交试验对镀液配方进行优化,得到制备铟-锡合金电极的最佳工艺条件为:In2(SO4)350 g/L,SnSO430 g/L,柠檬酸40 g/L,添加剂TSNA4 g/L,稳定剂3g/L,电流密度1.5 A/dm2,温度25℃,pH约1.5.最佳工艺下制备的In-Sn合金镀层呈均匀的灰白色,结合力良好,In-Sn合金电极上电还原CO2生成甲酸的电流效率达71％,稳定性良好.