Corresponding Author

Gong-quan SUN(gqsun@dicp.ac.cn);
Hai SUN(sunhai@dicp.ac.cn)


Direct methanol fuel cells (DMFC) generally use oxygen as an oxidant. Contaminants such as sulfides and nitrides in the air can affect the performance of the DMFC. In this work, the effects of SO2 on the performance of DMFC were investigated and the mechanism of poisoning was analyzed, by means of constant current discharge curve, polarization performance curve, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). In the CV scan, the permeated methanol was oxidized at a low potential to eliminate its effect on the SO2 poisoning behavior test. The results showed that the SO2 poisoning resulted in a decrease in the electrochemical activity surface area (ECSA) of the catalyst. Meanwhile, the EIS data indicated that the poisoning led to an increase in the charge transfer resistance of the oxygen reduction reaction (ORR). Therefore, the poison accelerated decay of the open circuit voltage and operating voltage of the DMFC, and decreased the peak power density. Further investigations of three recovery strategies, dry air purging and load-shifting I-V operations could only partially restore the performance of DMFC. However, CV scanning could accomplish the recovery more completely.

Graphical Abstract


direct methanol fuel cell, sulfur dioxide, adsorption, recovery

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