科研之友
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摘要
TiO2 doped tantalum was successfully synthesized via an evaporation-induced self-assembly method (EISA) as a support of IrO2 for a solid polymer electrolyte water electrolyzer (SPEWE). The IrO2 was synthesized on the surface of Ta-doped TiO2 support by using the Adams fusion method. The samples were characterized by BET, XRD, SEM, TEM, CV, EIS and polarization curves of single cells. The doping amount of Tantalum (5, 10, 20, 30 at%) was thoroughly investigated to evaluate the effects on structure, electric conductivity and oxygen evolution reaction (OER) activity of Ta-doped titania supported IrO2. The results indicated that a significant effect of the Ta dopant on the phase composition and conductivity. Among all the catalysts, with the optimized catalyst IrO2 loading, the terminal applied potential was 1.849 V at 1000 mA cm(-2) and 80 degrees C in a SPE water electrolysis cell using 80IrO(2)/Ti0.7Ta0.3O2 as anode. IrO2 loading 80% IrO2/Ti0.7Ta0.3O2 showed better performance than that of the pristine IrO2 after normalizing the current density for IrO2 loading. The increased performance can be attributed to the better dispersion of the IrO2 on Ti0.7Ta0.3O2 resulting in smaller crystallites and large surface area. In closing, Ti0.7Ta0.3O2 showed outstanding promise as an electrocatalyst support in SPE water electrolysis.
