In direct methanol fuel cells (DMFCs), the methanol crossover from the anode to the cathode is a major cause of power density loss because of the overpotential arising due to the parasitic reaction of methanol oxidation at the cathode. Catalysts modified with S have shown better methanol tolerance; however, the preparation routes often require high temperatures or pressures and very long times, making these expensive and unlikely to be used in large scale. Here, we report on a single-step low-temperature method used to prepare a carbon-supported Pt_xS_y catalyst. Moreover, we show that the catalyst shows lower depolarization in the presence of methanol and study the effect of reductive thermal treatment and electrochemical potential cycling.

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在直接甲醇燃料电池（DMFC）中，由于阳极上甲醇氧化的寄生反应引起的过电位，导致从阳极到阴极的甲醇穿越是功率密度损失的主要原因。用S改性的催化剂显示出更好的甲醇耐受性。然而，制备路线通常需要高温或高压且非常长的时间，这使得它们昂贵且不太可能大规模使用。在这里，我们报告了一种用于制备碳载Pt _x S _y催化剂的单步低温方法。此外，我们表明该催化剂在甲醇存在下显示出较低的去极化作用，并研究了还原热处理和电化学势循环的作用。

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