In the realm of nanomaterial-enabled heterogeneous catalysis,promoting the stability of ultrafine metal nanoparticles(NPs)has long been a crucial but challenging task. Ultrafine NPs with a high surface-to-volume ratio show improved metal accessibility.However, their thermodynamic instability under operational conditions(like elevated temperature of 700℃ and reducing atmosphere during methane dry reforming) induces irreversible sintering [1], which severely diminishes active sites, resulting in declination of catalytic performances [2]