Annealing‐Free Platinum−Cobalt Alloy Nanoparticles on Nitrogen‐Doped Mesoporous Carbon with Boosted Oxygen Electroreduction Performance

Abstract

Abstract Oxygen reduction reaction (ORR) catalysts are critical components for the development of high‐efficiency fuel cells and metal‐air batteries. Supported PtCo alloy nanoparticles (NPs) with modified surface properties and reactivity through ligand, strain and/or ensemble effects are regarded as promising inexpensive low‐Pt candidates. Herein, we report an annealing‐free assembly of PtCo nanoparticles anchored on nitrogen‐doped mesoporous carbon (PtCo@NMC) for advanced ORR electrocatalysis in both alkaline and acidic electrolytes. Compared with the commercial Pt/C catalyst, the half‐wave potential (E 1/2 ) values of PtCo@NMC increase to 0.93–0.94 V (Vs. RHE) and positively shift by approximately 45 mV. Moreover, the annealing‐induced degradation stems from agglomeration and growth of alloy NPs. Considering the excellent long‐term durability according to both chronoamperometry (CA) and accelerated durability tests (ADTs), we demonstrate practical application with enhanced performance in electrochemical energy devices, such as a primary Zn–air battery assembled with PtCo@NMC cathode.