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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: Self-templated Synthesis of Nickel Silicate Hydroxide/Reduced Graphene Oxide Composite Hollow Microspheres as Highly Stable Supercapacitor Electrode Material

Fig. 2

a, b FESEM images of pristine SiO2 and SiO2/GO microspheres, showing the smooth and relatively rougher external surface, respectively; the insets in a and b are digital photographs of the corresponding aqueous suspensions of SiO2 and SiO2/GO microspheres, which are pure white and yellow brown in color, respectively. c, d FESEM images of as-prepared Ni3Si2O5(OH)4/RGO composite hollow microspheres at low and high magnifications, respectively; the inset in c is a digital photograph of their aqueous dispersion, showing dark black in color. e TEM image of an individual Ni3Si2O5(OH)4/RGO hollow microsphere; the inset is an HRTEM image of a random nanoflake located on its surface, displaying the (002) lattice plane. f STEM image of a single Ni3Si2O5(OH)4/RGO hollow microsphere. g–j EDS mapping images of elements Ni, Si, O, and C for the Ni3Si2O5(OH)4/RGO microsphere shown in f. k, l FESEM images of bare Ni3Si2O5(OH)4 hollow microspheres at low and high magnifications, respectively; the inset in k is a digital photograph of their aqueous dispersion, exhibiting bright green in color

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