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. 2017 Dec 5;5(3):1700515. doi: 10.1002/advs.201700515

Figure 10.

Figure 10

a,b) SEM images of ZIF/GO with different magnifications; c) The synthesis procedure of hierarchically nanoporous Co–Nx/C materials (ZIF/rGO‐700‐AL). Step 1, the nucleation of ZIF seeds on both sides of a graphene oxide (GO) nanosheet. Step 2, the growth of ZIF nanocrystal arrays supported on a GO nanosheet (ZIF/GO). Step 3, carbonization of GO supported ZIF nanocrystal arrays at 700 °C in an Ar atmosphere to obtain a macroporous Co–Nx/C material (ZIF/rGO‐700). Step 4, acid leaching to remove large Co nanoparticles and hence produce a meso/microporous structure (ZIF/rGO‐700‐AL). Reproduced with permission.171 Copyright 2015, Royal Society of Chemistry.