fig2

Figure 2. (A) The scheme of hierarchical TiOS/NHCS photocatalysts^[81], Copyright 2021, Elsevier Ltd; (B) Schematic of the MnOx@TiO₂@CdS@Au synthesis route and (C) TEM images^[82], Copyright 2023, Wiley-VCH; (D) SEM images of Co₃O₄@SiO₂@TiO₂ and (E) Co₃O₄@TiO₂@CdS double-shelled Nanocage; (F) TEM images of Co₃O₄@TiO₂@CdS@Au mono-shelled nanocages^[83], Copyright 2023, Elsevier Ltd. TEM: Transmission electron microscopy; SEM: scanning electron microscopy.