Entropy‐Driven Self‐Regeneration of Ultrafine Pt on Porous High‐Entropy Oxide Nanofibers

Metal sintering triggers premature failure of supported catalysts even at temperatures as low as 80 °C, fundamentally restricting their high‐temperature applications. In this work, porous high‐entropy oxide (HEO) nanofibers are explored to facilitate the self‐regeneration of sintered Pt species through their unique high‐entropy effect. The high configurational entropy in the Pt/HEO enabled Pt nanoparticles to redisperse from 5.8 nm (after sintering at 900 °C) down to 3.4 nm through a simple low‐temperature thermal treatment at 500 °C, which is also verified by in situ HAADF−STEM. The self‐regenerative Pt/HEO‐900‐500 °C achieved near‐complete recovery of CO oxidation performance, with only a 4 °C increase in T 50 (50% conversion temperature) compared to that of pristine Pt/HEO. Especially, Pt/HEO‐900‐500 °C demonstrates a low deactivation rate constant of 4.7 × 10 −3 h −1 for 85 h running in CO oxidation. This work establishes configurational entropy engineering as a universal stabilization paradigm for supported nanocatalysts under extreme thermal environments.