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Abstract: Pt nanoparticle is a strong reductant and has been used as an antioxidant in cosmetics and medicine. It was reported to have catalase‐like activity, which converts hydrogen peroxide to water and oxygen. However, in this study, freshly prepared Pt nanoparticle was almost inert towards decomposing hydrogen peroxide. The catalase‐like activity of Pt nanoparticle increased with increasing weeks...