College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Jiangsu 215123, China.
Testing & Analysis Center, Soochow University , Jiangsu 215123, China.
J Am Chem Soc. 2017 Jul 19;139(28):9576-9582. doi: 10.1021/jacs.7b03510. Epub 2017 Jul 5.
Although explosive studies on pursuing high-performance Pt-based nanomaterials for fuel cell reactions have been carried out, the combined controls of surface composition, exposed facet, and interior structure of the catalyst remains a formidable challenge. We demonstrate herein a facile chemical approach to realize a new class of intermetallic Pt-Pb-Ni octahedra for the first time. Those nanostructures with unique intermetallic core, active surface composition, and the exposed facet enhance oxygen reduction electrocatalysis with the optimized PtPbNi octahedra exhibiting superior specific and mass activities (5.16 mA/cm and 1.92 A/mg) for oxygen reduction reaction (ORR) that are ∼20 and ∼11 times higher than the commercial Pt/C, respectively. Moreover, the PtPbNi octahedra can endure at least 15 000 cycles with negligible activity decay, showing a new class of Pt-based electrocatalysts with enhanced performance for fuel cells and beyond.
尽管人们对用于燃料电池反应的高性能 Pt 基纳米材料进行了大量的探索性研究，但催化剂表面组成、暴露晶面和内部结构的综合控制仍然是一个巨大的挑战。本文首次报道了一种简便的化学方法来实现一类新的 Pt-Pb-Ni 八面体金属间化合物。这些具有独特的金属间核、活性表面组成和暴露晶面的纳米结构增强了氧还原电催化性能，优化后的 PtPbNi 八面体在氧还原反应（ORR）中表现出优异的比活性（5.16 mA/cm）和质量活性（1.92 A/mg），分别是商业 Pt/C 的 20 倍和 11 倍。此外，PtPbNi 八面体在至少 15000 次循环后仍能保持几乎没有活性衰减，为燃料电池及其他领域提供了一类具有增强性能的新型 Pt 基电催化剂。
