The reduction of gaseous oxygen on carbon supported platinum electrodes has been studied at 150 degrees C with polarization and potential decay measurements. The electrolyte was either 100 weight percent phosphoric acid or that acid with a fluorinated additive, potassium perfluorohexanesulfonate (C6F13SO3K). The pseudo-Tafel curves of the overpotential vs. log (ii(L)/(i(L) - i)) show a two-slope behavior, probably due to different adsorption mechanisms. The potential relaxations as functions of log (t + tau) and log (-d eta/dt) have been plotted. The variations of these slopes and the dependence of the double-layer capacitance on the overpotential depended on the electrode manufacture and the kind of electrolyte (whether containing the fluorinated additive or not).
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机译：已经在150摄氏度下通过极化和电势衰减测量研究了碳载铂电极上气态氧的还原。电解质是100重量百分比的磷酸或带有氟化添加剂全氟己烷磺酸钾（C6F13SO3K）的酸。过电势与log（ii（L）/（i（L）-i））的拟Tafel曲线显示出两个斜率行为，这可能是由于不同的吸附机理所致。绘制了作为log（t + tau）和log（-d eta / dt）函数的潜在弛豫。这些斜率的变化以及双层电容对超电势的依赖性取决于电极制造和电解质的类型（是否包含氟化添加剂）。
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