Three 40 wt % Pt/C electrocatalysts prepared using two different approaches—the polyol process and electrochemical dispersion of platinum under pulse alternating current—and a commercial Pt/C catalyst (Johnson Matthey prod.) were examined via X-ray diffraction (XRD) and transmission electron microscopy (TEM). The stability characteristics of the Pt/C catalysts were studied via long-term cycling, revealing that, for all cycling modes, the best stability was achieved for the Pt/C catalyst with the largest platinum nanoparticle sizes, which was synthesized via electrochemical dispersion of platinum under pulse alternating current. Our results show that the mass and specific electrocatalytic activities of Pt/C catalysts toward ethanol electrooxidation are determined by the value of the electrochemically active Pt surface area in the catalysts.

中文翻译：

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“自下而上”和“自上而下”方法合成Pt / C电催化剂的比较

通过X射线衍射（XRD）检查了使用两种不同方法（多元醇工艺和脉冲交流电下铂的电化学分散）制备的三种40 wt％Pt / C电催化剂和市售Pt / C催化剂（Johnson Matthey产品）。和透射电子显微镜（TEM）。通过长期循环研究了Pt / C催化剂的稳定性，发现在所有循环模式下，铂纳米颗粒尺寸最大的Pt / C催化剂的最佳稳定性是通过电化学分散法合成的。脉冲交流电下的铂。我们的结果表明，Pt / C催化剂对乙醇电氧化的质量和比电催化活性取决于催化剂中电化学活性Pt表面积的值。