Fig. 1

Fabrication of VN//Co(OH)2-PHMSs and characterization of VN nanosheets and Co(OH)2 nanoflowers. a Schematic illustrating the fabrication of VN//Co(OH)2-PHMSs. b XRD pattern, c low-magnification (scale bar is 1 μm) and high-magnification (inset, scale bar is 200 nm) SEM images, and d TEM image (scale bar is 250 nm) of porous VN nanosheets. e XRD pattern, f low-magnification (scale bar is 1 μm) and high-magnification (inset, scale bar is 200 nm) SEM images, and g TEM image (scale bar is 500 nm) of Co(OH)2 nanoflowers