Sb And Mo Doping Of Pd-SnO₂-CNTs Catalyst And Its Application In Direct Formate Fuel Cell

Direct formate fuel cell is a non-toxic and high conversion efficiency green energy.In our laboratory,Pd-Sn O₂-CNTs catalyst was prepared by in-situ reduction method,which was used to catalyze the formate electrooxidation and oxygen reduction reaction and achieved good performance.Its Sn O₂ conductivity and Pd catalytic activity need to be improved.Firstly,tin antimony oxide（ATO）was prepared by Sb doping to improve the conductivity of Sn O₂.The effects of sb doping amount and calcination temperature on the conductivity of ATO were studied.The results show that when the content of Sb is5 at%,and the calcination temperature is 550℃,the conductivity of Sn O₂ increases the most.After that,Pd-ATO-CNTs catalyst was prepared by in-situ reduction method and used in the formate electrooxidation and oxygen reduction reaction.The results showed that the activity and stability of Pd-ATO-CNTs catalyst were improved compared with Pd catalyst supported by Sn O₂.In order to further improve the utilization,activity and stability of precious metal Pd and prevent the agglomeration of Pd in the catalytic process,Pd&Mo O₂-ATO-CNTs catalyst was prepared by in-situ deposition of Mo compounds as site blockers,and applied to oxygen reduction reaction.The results showed that the catalytic activity and stability of the catalyst for the oxygen reduction reaction were improved,which could be attributed to the blocking effect of Mo O₂ and the cocatalysis effect.Finally,in order to verify the actual performance of the catalyst,the direct formate fuel cell was assembled and tested.The results show that compared with the catalyst without Sb or Mo,the catalyst doped with Sb or Mo can significantly improve the overall performance of the fuel cell.