The experimental details for synthesis of SiO2 microspheres and SiO2/GO composite microspheres. Figure S1 (a, b) FESEM images of pristine SiO2 microspheres at low and high magnifications, respectively. (c, d) FESEM images of SiO2/GO composite microspheres at low and high magnifications, respectively. Figure S2 FESEM images of Ni3Si2O5(OH)4/RGO hybrid material synthesized in the absence of PVP. Figure S3 (a) GCD curves of bare Ni3Si2O5(OH)4 hollow microspheres measured at a set of varied current densities. (b) Specific capacitance of bare Ni3Si2O5(OH)4 hollow microsphere electrode deduced from the GCD curves depicted in (a) as a function of current density. (DOCX 5399 kb
