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. 2021 Dec 10;9(1):2104183. doi: 10.1002/advs.202104183

Figure 2.

Figure 2

Synthesis of hollow structural materials via hard template method. a) Schematic diagram of fabrication of ZIF‐8‐H. Reproduced with permission.[ 45 ] Copyright 2014, American Chemical Society. b) Schematic illustration for the synthesis of the hollow gradient structured Fe3O4@C nanospheres by an inorganic–organic competitive coating strategy. Reproduced with permission.[ 46 ] Copyright 2021, Springer Nature. c) Schematic diagram of the in situ Stöber templating of HMCS. Reproduced with permission.[ 52 ] Copyright 2016, Royal Society of Chemistry. d) Scheme of the synthetic process of HBC or hollow carbon sphere (HCS) with different shell thicknesses via adjusting mass ratio of reagents. Reproduced with permission.[ 53 ] Copyright 2020, Wiley‐VCH.