高质量和深度凹陷的PtPdNi纳米立方体作为高效氧还原反应的催化剂

聚合物电解质燃料电池阴极上的氧还原反应需要使用铂基催化剂,铂是地球上的贵金属之一.采用将不同的金属优化到核心中等多种策略可提高铂基催化剂的活性,从而降低铂的负载量.通过致力于高催化活性Pt2.7Pd0.3Ni凹面立方结构与高指数晶面的复合,表明凹面结构可以提供更多的活性位和高水平的催化活性,如果与其他金属复合,可以降低...

High-quality and deeply excavated PtPdNi nanocubes as efficient catalysts toward oxygen reduction reaction

The oxygen reduction reaction (ORR) on the cathode of a polymer electrolyte fuel cell requires the use of a catalyst based on Pt, one of the most expensive metals on the earth. A number of strategies, including optimization of a different metal into the core, have been investigated to enhance the activity of a Pt-based catalyst and thus reduce the loading of Pt. By dedicating to compounding high catalytic activity Pt2.7Pd0.3Ni concave cubic with high index crystal face, the paper shows that con-cave structures can offer more active site and high level of catalytic activity and if mixed with other metal, decrease the proportion of Pt and improve its mass activity. The paper also makes an exploration into the theory and conditions behind the formation of Pt2.7Pd0.3Ni concave cubic struc-ture, and investigates the difference it demonstrates by modifying the reactive conditions. The re-sults of the oxygen reduction performance of the electrochemical test are as follows: the concave cube-shaped Pt-Pd-Ni catalyst has a mass activity of 1.28 A mgPt-1 at 0.9 V, its highest mass activity is 8.20 times that of commercial Pt/C, and its specific activity is 8.68 times of that commercial Pt/C. And the Pt-Pd-Ni ternary nanocage has excellent structural invariance. After the stability test, there is no obvious structural change and performance degradation in the nanostructure.