This sheet comprises a substrate and a particle-containing layer, wherein the particle-containing layer contains a polymer component (A) and particles (B) which are mesoporous silica carrying a substance that contains a platinum group element, wherein the platinum group element concentration (Pt) exceeds 0.07 atom% relative to a total 100 atom% of the atomic concentrations of carbon atoms, oxygen atoms, silicon atoms, and platinum group elements, measured by X-ray photoelectron spectroscopy (XPS) on the surface (α) of the particle-containing layer opposite of the substrate.

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