The synthesis of efficient and stable Pt alloy catalysts is a major challenge for the commercialization of PEMFC. Herein, we report a PtCo/C(N) electrocatalyst prepared by Na2CO3‐assisted urea liquid‐phase deposition strategy as an efficient cathodic oxygen reduction reaction electrocatalyst, and test its activity and stability in a rotating disc electrode and a single‐cell. The membrane electrode prepared with PtCo/C(N)‐800 °C catalyst has an output voltage of 0.652 V at 2 A/cm2 and a maximum power density of 1.501 W/cm2, which are 36 mV and 81 W/cm2 higher than those of commercial Pt/C catalyst, respectively. In addition, the mass activity and half‐wave potential of PtCo/C(N)‐800 °C are 2.44 times and 50 mV higher than those of commercial Pt/C, respectively. After 5000 voltammetric cycles, its mass activity and half‐wave potential only lose 35 A/gPt and 9 mV, respectively. XPS results show that the binding energy of Pt 4f is positively shifted relative to Pt/C‐TKK, and the d‐band center of Pt decreases, leading to weak chemical interaction between the oxygen‐containing intermediate and the surface of the electrocatalyst, which is conducive to the improvement of the ORR activity and stability of the catalyst.

中文翻译：

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热处理对质子交换膜燃料电池PtCo/C(N)电催化剂氧还原反应性能的影响

高效稳定的Pt合金催化剂的合成是PEMFC商业化的重大挑战。在此，我们报道了一种由Na制备的PtCo/C(N)电催化剂2一氧化碳3‐辅助尿素液相沉积策略作为一种高效的阴极氧还原反应电催化剂，并在旋转圆盘电极和单电池中测试其活性和稳定性。 PtCo/C(N)-800℃催化剂制备的膜电极在2A/cm电流下输出电压为0.652V2最大功率密度为1.501 W/cm2，分别为 36 mV 和 81 W/cm2分别高于商用 Pt/C 催化剂。此外，PtCo/C(N)-800 °C的质量活度和半波电位分别比商业Pt/C高2.44倍和50 mV。经过5000次伏安循环后，其质量活度和半波电位仅损失35 A/g铂和 9 mV 分别。 XPS结果表明，Pt 4f的结合能相对于Pt/C-TKK发生正移，并且Pt的d带中心降低，导致含氧中间体与电催化剂表面之间的化学相互作用较弱，有利于提高催化剂的ORR活性和稳定性。