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(a) Schematic illustration of the synthesis process of the TiO@C-HS/S composite. SEM and TEM images of (b–e) PS spheres, (f–i) PS@TiO2 core-shell spheres and (j–m) PS@TiO2@PDA spheres. Scale bars, 1 μm (b,f,j), scale bars, 200 nm (c,g,k), scale bars, 500 nm (d,h,l), scale bars, 100 nm (e,i,m).
