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Abstract
Acidic oxygen evolution reaction is crucial for proton exchange membrane water electrolysers, which have been hindered by the high catalytic overpotential and high loading of noble metal catalysts and high mass transfer resistance. Here we present an ordered anode with ultra low precious metal loading. Ordered TiO2 nanotubes were grown on a titanium substrate by elec-tro-oxidation, then treated at high temperature in H2/Ar to enhance the electrical conductivity of the substrate, and finally loaded with IrO2 by electrodeposition. This ordered anode exhibits a low overpotential of 224 mV at 10 mA cm-2 towards oxygen evolution reaction in 0.5 M H2SO4. A proton exchange membrane electrolyser using the ordered anode with a low mass loading of 59.27 μg cm-2 can operate stably at 500 mA cm-2 for 1000 hours. The contact resistance of the ordered membrane electrode assembly is lower than that of the conventional second generation membrane electrode by the equiva-lent circuit fitting analysis of electrochemical impedance spectra.
Supplementary materials
Title
Study on ordered anode in proton exchange membrane water electrolysers
Description
Ordered TiO2 nanotubes were grown on a titanium substrate by elec-tro-oxidation, then treated at high temperature in H2/Ar to enhance the electrical conductivity of the substrate, and finally loaded with IrO2 by electrodeposition. This ordered anode exhibits a low overpotential of 224 mV at 10 mA cm-2 towards oxygen evolution reaction in 0.5 M H2SO4. A proton exchange membrane electrolyser using the ordered anode with a low mass loading of 59.27 μg cm-2 can operate stably at 500 mA cm-2 for 1000 hours.
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