The catalytic activity of noble metal nanoparticles mainly depends on the active atoms on their surface, and the smaller the specific surface area, the higher the surface activity of noble metal nanoparticles, but the higher surface energy may cause the nanoparticles to aggregate, thereby reducing the specific surface area and reducing the catalytic activity. Therefore, the hydrogel is used as a template to immobilize precious metal nanoparticles to exert its due catalytic activity.
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