Asymmetric Dual‐Atomic Catalyst with Axial Chloride Coordination for Efficient Oxygen Reduction Reaction

Abstract Low‐platinum‐group metal (low‐PGM) catalysts play a crucial role in reducing the cost of proton exchange membrane fuel cells (PEMFCs). Dual‐atomic catalysts offer valuable solutions due to their exceptional performance. This work explores the application of axial Cl‐coordinated Pt─Co dual atoms on N‐doped graphitic carbon (Pt 1 Co 1 /NC─Cl) catalysts utilizing PtCo dual‐atomic catalysts, demonstrating their ability to significantly enhance the acidic oxygen reduction reaction (ORR) catalytic performance of conventional PtCo catalysts. The half‐wave potential (E 1/2 ) reaches 0.841 V in a 0.1 M HClO 4 solution, and only a reduction of 12 mV in E 1/2 is observed after 5000 cycles. Axial Cl proves to be resistant to removal during the electroreduction reaction. Consequently, the use of heteroatom‐modulated asymmetric structures can greatly improve the performance of Pt‐based catalysts. Incorporating nonmetallic synergistic Pt‐group metals presents a promising solution for achieving high‐performance Low‐PGMs.