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Effect of trifluoromethanesulfonic acid on the ORR activity of Pt in acid medium

机译：三氟甲磺酸对酸性介质Pt的orr活性的影响

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In this paper, to study the effect of sulfonic groups on the ORR activity of Pt and exclude the effect ofpolytetrafluoroethylene (PTFE) backbone of Nafion, trifluoromethanesulfonic acid (CF3SO3H) was usedto simulate the SO3H-terminated side chains of Nafion. By using the CO displacement technique, it waspredetermined that much more sulfonic groups are absorbed on the Pt surface in 50 mM CF3SO3Hsolution compared with that of 0 mM and 1 mM. The influence of sulfonic groups on the oxygenreduction reaction (ORR) activity of Pt is analyzed by using rotating Pt disk electrode (RDE) as workelectrode in 0.1 M HClO4 with various CF3SO3H contents. It is found that when the content of CF3SO3His over 5 mM, the electrochemical active area of Pt decreases with increasing the content of CF3SO3Hin solution, and the oxidation peak of Pt shifts to a higher potential. Meanwhile, the kinetic current lossof Pt increases apparently along with the increase of CF3SO3H content which is 40% for 10 mM and71.3% for 50 mM at 0.9 V, respectively. The result shows that excess sulfonic groups of Nafion adsorbedon the surface of Pt will greatly lower the ORR activity of Pt.
机译：在本文中，为了研究磺酸基对Pt的orr活性的影响，排除了Nafion的聚硝基乙烯（PTFE）骨架的作用，使用三氟甲磺酸（CF3SO3H）来模拟Nafion的SO3H封端的侧链。通过使用CO位移技术，含有更多的磺酸基团在50mM CF 3 SO 3H溶液中被吸收更多的磺酸基团，而0mm和1mm。通过使用旋转Pt盘电极（RDE）作为在0.1M HClO 4中的旋转Pt盘电极（RDE），分析磺化基团对Pt的氧化反应（ORR）活性的影响，以0.1M HClO 4，具有各种CF 3 SO 3H含量。结果发现，当CF3SO3HIS的含量超过5mm时，PT的电化学活性面积随着CF3SO3HIN溶液的含量而降低，PT的氧化峰变为较高的电位。同时，PT的动力电流损失显然随着CF3SO3H含量的增加，分别为0.9V的50mm和71.3％的40％，分别为0.9毫米。结果表明，PT的表面浓度的磺酸浓度含量过多，Pt的表面将大大降低Pt的ORR活性。

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