Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea.
Nanoscale. 2018 Nov 8;10(43):20073-20088. doi: 10.1039/c8nr06554c.
Designing highly efficient and durable electrocatalysts for the oxygen reduction reaction (ORR), the key step for the operation of polymer electrolyte membrane fuel cells (PEMFCs), is of a pivotal importance for advancing PEMFC technology. Since the most significant progress has been made on Pt3Ni(111) alloy surfaces, nanoscale PtNi alloy octahedra enclosed by (111) facets have emerged as promising electrocatalysts toward the ORR. However, because their practical uses have been hampered by the cost, sluggish reaction kinetics, and poor durability, recent advances have engendered a wide variety of structure-, size-, and composition-controlled bimetallic PtNi octahedra. Herein, we therefore review the important recent developments of PtNi octahedral electrocatalysts point by point to give an overview of the most promising strategies. Specifically, the present review article focuses on the synthetic methods for the PtNi octahedra, the core-shell and multi-metallic strategies for performance improvement, and their structure-, size-, and composition-control-based ORR activity. By considering the results achieved in this field, a prospect for this alloy nanocatalysts system for future sustainable energy applications is also proposed.
设计高效、耐用的氧还原反应（ORR）电催化剂对于推进聚合物电解质膜燃料电池（PEMFC）技术至关重要，而 ORR 是 PEMFC 运行的关键步骤。由于在 Pt3Ni（111）合金表面取得了最显著的进展，因此具有（111）面封闭的纳米级 PtNi 合金八面体作为 ORR 的有前途的电催化剂而出现。然而，由于成本高、反应动力学缓慢和耐久性差，其实际应用受到了阻碍，因此最近的进展产生了各种结构、尺寸和组成控制的双金属 PtNi 八面体。在此，我们逐一对 PtNi 八面体电催化剂的重要最新进展进行了综述，以概述最有前途的策略。具体而言，本综述文章重点介绍了 PtNi 八面体的合成方法、提高性能的核壳和多金属策略，以及基于结构、尺寸和组成控制的 ORR 活性。通过考虑该领域的研究成果，还对该合金纳米催化剂系统在未来可持续能源应用中的前景进行了展望。
