Octahedral PtNi/C catalysts have demonstrated superior catalytic performance in oxygen reduction reaction (ORR) over commercial Pt/C with rotating disk electrode (RDE). However, it is not trivial to translate such promising results to real-world membrane-electrode assembly (MEA). In this work, we have synthesized octahedral PtNi/C catalysts using poly(diallyldimethylammonium chloride) (PDDA) as a capping agent and investigated their performance from RDE to MEA. In RDE, mass activity and specific activity of the optimized octahedral PtNi/C catalyst for oxygen reduction reaction (ORR) are nearly 19 and 28 times high of the state-of-the-art commercial Pt/C, respectively. At MEA level, the octahedral PtNi/C catalyst exhibits excellent power generation performance and durability paired with commercial Pt/C anode. Its cell voltage at 1,000 mA·cm⁻² reaches 0.712 V, and maximum power density is 881.6 mW·cm⁻² and its performance attenuation is also less, around 11.8% and 7% under galvanostatic condition of 1,000 mA·cm⁻² for 100 h. Such results are investiaged by thermodynamic analysis and fundametal performance modeling, which indicate the single cell performance can be further improved by reducing the size of PtNi/C catalyst agglomerates. Such encouraging results have demonstrated the feasibility to convey the superior performance of octahedral PtNi/C from RDE to MEA.

Open image in new window

与旋转圆盘电极（RDE）相比，八面体PtNi / C催化剂在氧还原反应（ORR）中表现出优异的催化性能。然而，将如此有希望的结果转化为现实世界的膜电极组件（MEA）并非易事。在这项工作中，我们已经使用聚二烯丙基二甲基氯化铵（PDDA）作为封端剂合成了八面体PtNi / C催化剂，并研究了它们从RDE到MEA的性能。在RDE中，优化的八面体PtNi / C催化剂的氧还原反应（ORR）的质量活性和比活性分别是最先进的商用Pt / C的近19倍和28倍。在MEA级别，八面体PtNi / C催化剂具有出色的发电性能和耐用性，可与商用Pt / C阳极配套使用。电池电压为1,000 mA·cm^-2达到0.712 V，最大功率密度为881.6 mW·cm ^-2，并且在1000 mA·cm ^-2的恒电流条件下100小时，其性能衰减也较小，分别约为11.8％和7％。通过热力学分析和基础金属性能模型研究了这些结果，这表明可以通过减小PtNi / C催化剂附聚物的尺寸来进一步提高单电池性能。这种令人鼓舞的结果证明了将八面体PtNi / C从RDE传递到MEA的可行性。

在新窗口中打开图像