Abstract
IrO2-ZrO2 binary oxide coatings coated on Ti substrate were fabricated using a sol-gel route. The impacts of calcination temperature on the surface morphology and electrocatalytic properties of the coatings were investigated by microstructure analysis and electrochemical measurements. The electrochemical properties of the IrO2-ZrO2 binary oxide coatings were found calcination temperature dependent, which could be attributed to the impacts of calcination temperature on the crystallinity, crystallite size and the cracks of the binary oxide coating. With the rise of the calcination temperature, the crystallite size of the active component increased, while the cracks of the coating decreased. The amorphous IrO2-ZrO2 binary oxide coatings were obtained at the calcination temperatures of 350 and 400°C, showing better electrocatalytic activity and lower stability for OER. The active surface area, impacted by the morphology of the binary oxide coating, is calcination temperature dependent. With the rise of calcination temperature, the electrocatalytic activity decreased, while the stability of the IrO2-ZrO2 binary oxide coating for OER increased. Given the electrocatalytic activity and stability of all investigated anodes, the anode calcined at 450°C was considered the most suitable for applications.
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