The development of cathode oxygen reduction reaction (ORR) catalysts with high characteristics for practical, direct methanol fuel cells (DMFCs) has continuously increased the attention of researchers. In this work, interface-rich Au-doped PdBi (PdBiAu) branched one-dimensional (1D) alloyed nanochains assembled by sub-6.5 nm particles have been prepared, exhibiting an ORR mass activity (MA) of 6.40 A·mg_Pd⁻¹ and long-term durability of 5,000 cycles in an alkaline medium. The MA of PdBiAu nanochains is 46 times and 80 times higher than that of commercial Pt/C (0.14 A·mg_Pt⁻¹) and Pd/C (0.08 A·mg_Pd⁻¹). The MA of binary PdBi nanochains also reaches 5.71 A·mg_Pd⁻¹. Notably, the PdBiAu nanochains exhibit high in-situ carbon monoxide poisoning resistance and high methanol tolerance. In actual DMFC device tests, the PdBiAu nanochains enhance power density of 140.1 mW·cm⁻² (in O₂)/112.4 mW·cm⁻² (in air) and durability compared with PdBi nanochains and Pt/C. The analysis of the structure—function relationship indicates that the enhanced performance of PdBiAu nanochains is attributed to integrated functions of surficial defect-rich 1D chain structure, improved charge transfer capability, downshift of the d-band center of Pd, as well as the synergistic effect derived from “Pd-Bi” and/or “Pd-Au” dual active sites.

用于实用的直接甲醇燃料电池（DMFC）的高性能阴极氧还原反应（ORR）催化剂的开发不断增加研究人员的关注。在这项工作中，制备了由亚 6.5 nm 颗粒组装而成的富界面 Au 掺杂 PdBi (PdBiAu) 分支一维 (1D) 合金纳米链，其 ORR 质量活度 (MA) 为 6.40 A·mg _Pd ^-1在碱性介质中长期耐用 5,000 次。_{PdBiAu纳米链的MA分别是商业Pt/C（0.14 A·mg Pt} ^-1）和Pd/C（0.08 A·mg _Pd ^-1 ）的46倍和80倍。二元PdBi纳米链的MA也达到5.71 A·mg _Pd ^-1. 值得注意的是，PdBiAu 纳米链表现出高原位一氧化碳中毒抗性和高甲醇耐受性。在实际的DMFC器件测试中，与PdBi纳米链和Pt/C相比，PdBiAu纳米链提高了140.1 mW·cm ^-2 (在O ₂中)/112.4 mW·cm ^{-2 (在空气中)的功率密度和耐久性。}结构-功能关系分析表明，PdBiAu纳米链的性能增强归因于表面缺陷丰富的一维链结构的综合功能、提高的电荷转移能力、Pd的d带中心下移以及协同作用。源自“Pd-Bi”和/或“Pd-Au”双活性位点的效应。