Ti4O7 supported IrOx for anode reversal tolerance in proton exchange membrane fuel cell
Fuel starvation can occur and cause damage to the cell when proton exchange membrane fuel cells operate under complex working conditions. In this case, carbon corrosion occurs. Oxygen evolution reaction (OER) catalysts can alleviate carbon corrosion by introducing water electrolysis at a lower potential at the anode in fuel shortage. The mixture of hydrogen oxidation reaction (HOR) and unsupported OER catalyst not only reduces the electrolysis efficiency, but also influences the initial performance of the fuel cell. Herein, Ti 4 O 7 supported IrO x is synthesized by utilizing the surfactant-assistant method and serves as reversal tolerant components in the anode. When the cell reverse time is less than 100 min, the cell voltage of the MEA added with IrO x /Ti 4 O 7 has almost no attenuation. Besides, the MEA has a longer reversal time (530 min) than IrO x (75 min), showing an excellent reversal tolerance. The results of electron microscopy spectroscopy show that IrO x particles have a good dispersity on the surface of Ti 4 O 7 and IrO x /Ti 4 O 7 particles are uniformly dispersed on the anode catalytic layer. After the stability test, the Ti 4 O 7 support has little decay, demonstrating a high electrochemical stability. IrO x /Ti 4 O 7 with a high dispersity has a great potential to the application on the reversal tolerance anode of the fuel cell.
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