Defect-rich ultrathin AuPd nanowires with Boerdijk–Coxeter structure for oxygen reduction electrocatalysis

Abstract

Optimization of the morphology and composition of noble metal architectures is essential to construct cathode electrocatalyst for fuel cells with high catalytic activity. Ultrathin nanowires with unique physical and chemical properties have attracted increasing research interest for a broad range of applications in electrochemical catalysis. Here, we report a simple preparation method of ultrafine alloy AuPd nanowires (AuPd NWs) with Boerdijk–Coxeter structure within 2 min for efficient oxygen reduction reaction (ORR) in 0.1 M KOH. The AuPd NWs have numerous exposed surface atoms and abundant structural defects that act as catalytic active sites, effectively enhanced ORR kinetics and charge transfer. Compared with AuPd nanoparticles and Pt/C catalysts, the constructed AuPd NWs exhibit excellent electrochemical ORR activity and stability. This work provides a feasible and novel strategy for the design and construction of defect-rich ultrafine bimetallic nanowires toward promising electrocatalytic applications.