A Competitive Ligand Strategy for Designing Pt ₃ Co Intermetallic Catalysts With Strong Metal‐Support Interaction for Durable PEM Fuel Cells

Ptbased intermetallic catalysts are the most promising electrocatalysts for the application of proton exchange membrane fuel cells (PEMFCs). However, nanoparticle aggregation during high‐temperature annealing and fuel cell operation inevitably results in a decrease of activity and stability. Herein, we propose a novel competitive ligand strategy to design ZIF‐derived mesoporous‐carbon support, which establishes a strong metal‐support interaction (SMSI) to firmly anchor small‐sized Pt 3 Co intermetallic nanoparticles (denoted as Pt 3 Co@mNC‐30%). Impressively, the Pt 3 Co@mNC‐30% catalyst not only delivers an ultrahigh power density of 2.32 and 1.08 W cm −2 under H 2 ─O 2 /Air atmospheres, but also presents outstanding durability of 550 h and the voltage loss is only 27 mV at 0.8 A cm −2 and 30 mV at 1.2 A cm −2 after 30 000 cycles of accelerated durability tests, which surpasses the DOE 2025 targets and ranks among the top‐performing Pt‐based catalyst fuel cells reported to date. The remarkable performance is primarily ascribed to the SMSI effect yielded by the mesopore support to anchor the nanoparticle. In short, the design strategy of mesopore support proposed here can construct the SMSI to anchor the nanoparticle and therefore boost the durability, which offers a promising pathway for the development of catalysts for PEMFCs.