【摘要】 采用共沉淀法制备SnO₂-CuO复合纳米催化剂,用于温室气体CO₂电催化还原。实验结果表明:催化活性的强弱取决于复合催化剂中的SnO₂和CuO的摩尔比。催化剂SnO₂（50%）-CuO（50%）的催化条件为最优,起峰电位可达到-0.75V,而在-1.25V时的最大电流密度能达到约-24 mA/cm²。测试结果表明,SnO₂（50%）-CuO（50%）/GDL的电容为200μF/cm²,比无负载的气体扩散电极（GDL）面积增加了30μF/cm²。复合催化剂平均粒径约为50nm,颗粒间隙为100nm,其疏松的结构对CO₂与催化剂的接触非常有利。离子色谱与电流-时间的关系表明SnO₂（50%）-CuO（50%）在-1.0V（vs SHE）电位下电解1h,可得到最优法拉第效率,高达74.1%。SnO₂（50%）-CuO（50%）复合催化剂的稳定性可高达30h。复合SnO₂-CuO纳米催化剂具有优良的CO₂电化学还原催化性能。更多还原

【Abstract】 Composite SnO₂-CuO nanocatalysts were prepared by co-precipitation methods,and applied to the technique about greenhouse gases CO₂ electroreduction.The result indicates that catalytic activity of composite SnO₂-CuO depended on the molar ratio of SnO₂ and CuO.When the ratio of SnO₂ was 50%,the SnO₂（50%）-CuO（50%）showed the best catalytic performance.The onset potential of SnO₂（50%）-CuO（50%）could reach to-0.75 Vand the current density at -1.25 Vcould be as high as about-24mA/cm².Test results show that the electric capacity of SnO₂（50%）-CuO（50%）/GDL was as high as 200μF/cm² and had more 30μF/cm² than the area of gas diffusion electrode（GDL）.SnO₂（50%）-CuO（50%）was made up of nanoparticles with an average diameter of about 50 nm.The length between particles was about 100 nm,which was good for the contact between CO₂ and electroreduction.Ion chromatography measurement demonstrates that when electrolysis at -1.0V for 1h,the maximum Faraday efficiency of formic acid could be high up to 74.1%.The stability of SnO₂（50%）-CuO（50%） was outstanding after even 30 hours electrolysis.So the SnO₂-CuO nanocatalysts have great catalytic activity.更多还原