High‐Performance Oxygen Reduction Electrocatalysis Enabled by 3D PdNi Nanocorals with Hierarchical Porosity

Cost‐effective electrocatalysts for the oxygen reduction reaction (ORR) play pivotal roles in energy conversion and storage processes. Designing a 3D networked bimetallic nanostructure with hierarchical porosity represents a reliable and effective strategy for the advancement of electrocatalysts with greatly improved activity and stability. However, it still remains a tremendous challenge in fabricating such fantastic nanostructure via a feasible and economical approach. Herein, a facile cyanogel‐bridged synthetic strategy is demonstrated to fabricate PdNi 3D nanocorals with hierarchical porosity. The elaborate integration of electronic and geometric effects endows the as‐fabricated PdNi 3D nanocorals with substantially enhanced activity and durability toward the ORR, as compared with the monometallic counterparts (pure Ni and Pd), PdNi nanoparticles, and commercial Pd black catalyst. More importantly, even after 5000 cycles of accelerated durability tests, the PdNi nanocorals can still maintain well in the catalytic activities, composition, and architectural features. It is believed that the as‐synthesized PdNi nanocorals may hold great promise in practical fuel cells and industrial applications. Furthermore, due to its simplicity and scale‐up production capability, the present cyanogel‐bridged synthetic strategy provides an attractive method for achieving other bi/trimetallic nanoalloys with both structural and compositional advantages for diverse electrochemical applications and beyond. A facile cyanogel‐bridged synthetic strategy is developed to fabricate PdNi 3D nanocorals with hierarchical porosity. The as‐fabricated porous PdNi 3D nanocorals exhibit much enhanced catalytic activity and stability toward the oxygen reduction reaction due to their unique 3D networked nanostructure with hierarchical porosity and synergistic effect of their alloyed components.