Preparation And Electrochemical Performance Research Of Direct Ethanol Fuel Cell Low Platium Loading Ternary Anode Catalyst

Researchers have focused on direct ethanol fuel cell as its low toxity and high energy density, ethanol can be abtained in large quantities from biomass. Catalysts are one of the major components in fuel cell. Catalysts play an important role in ethanol oxidation and even the commercialization of direct ethanol fuel cell. So far, Pt-based electrocatalysts are still the main object of study. It is difficult to commercialize fuel cell because of the high cost and low tolerance of Pt. Therefore, reduction of Pt and improvement of catalytic performance have become the focus in research. In this paper, PtSn-ZrO2/GN, PtSn-V2O5/GN and PtNi-CeO2/GN electrocatalysts were prepared. These catalysts were analyzed by physical characterization (such as XRD, HRTEM and XPS) and electrochemical characterization (cyclic voltammetry, linear sweep voltammetry and chronoamperometry). Details is as follows:(1) Preparation and catalytic performance research of PtSn-ZrO2/GN polynary catalystPtSn-ZrO2/GN electrocatalysts were prepared by two-step method. First, ZrO2 was loaded on graphene and then calcined under N2 atmosphere at high temperature. Chloroplatinic acid, stannous chloride and ZrO2/graphene were reacted together and ethylene glycol was used as reducing agent and solvent. The optimized molar ratio of Pt:Sn:ZrO2 was 0.122:0.081:1, that is Pt0.122Sn0.081-Zr02/GN catalyst occupies the highest current density and lowest onset potential (0.14V) for EOR. The activity of Pt0.122Sn0.081-ZrO2/GN is better than the relative unitary and binary catalysts.(2) Preparation and catalytic performance research of PtSn-V2O5/GN polynary catalystPtSn-V2O5/GN electrocatalysts were synthesized by two-step reduction method. First, V2O5/GN with different content of V2O5 were prepared by reduction method. Then Pt and Sn with different molar ratio were loaded on V2O5/GN by impregnation reduction method. The optimized molar ratio of Pt/Sn is 3:1. While the molar ratio of Pt:Sn:V2O5 is 1.29:0.43:1, Pt1.29Sn0.43-V2O5/GN electrocatalyst possesses the lowest onset potential and best stability, its catalytic activity is better than relative unitary and binary catalysts.(3) Preparation and catalytic performance research of PtNi-CeO2/GN polynary catalystCeO2/GN with different content of CeO2 were prepared by hydrothermal method. Then PtNi-CeO2/GN catalysts was synthesized by impregnation reduction method. The best molar ratio of Pt/Ni is 2:1, and whil npt:nNn:nceO2 is 2.74:1.37:1, Pt2.74Ni1.37-CeO2/GN electrocatalyst has the best catalytic activity. Catalyst particles were dispersed on graphene uniformly. CV, LSV and chronoamperometry are further used to prove that Pt2.74Ni1.37-CeO2/GN occupies the best CO tolerance and stability.