Large‐Scalable CO‐Tolerant Ultrathin PtTe 2 Nanosheets for Formic Acid Oxidation

Abstract Developing large‐scale platinum (Pt) alloys that simultaneously exhibit high formic acid oxidation reaction (FAOR) activity and robust CO tolerance remains a significant challenge for practical fuel cell applications. Here, a facile and universal in situ synthesis approach is presented to create ultrathin platinum‐tellurium nanosheets on carbon support (PtTe 2 NSs/C), which enables high CO tolerance and FAOR activity while achieving the massive production of PtTe 2 NSs/C. Specifically, the 10‐gram‐scale PtTe 2 NSs/C achieves exceptional specific activity and mass activity of 14.3 mA cm −2 and 3.6 A mg Pt −1 , respectively, which are 52.9 and 22.5 times greater than those of commercial Pt/C. Moreover, the 10‐gram‐scale PtTe 2 NS/C exhibits significantly higher FAOR stability than pristine Pt NSs/C and commercial Pt/C. Detailed mechanism and computational investigations collectively reveal that the integration of Te into Pt lattices enhances the utilization of Pt while constructing high‐density unsaturated “Pt‐Te sites” on the surface of PtTe 2 NSs/C, conferring high CO tolerance to PtTe 2 NSs/C and thus substantially enhancing the FAOR activity. This work contributes to providing a universal method for scaling up next‐generation high‐performing FAOR catalysts.