Fig. 3
From: Niobium pentoxide nanomaterials with distorted structures as efficient acid catalysts
Nb2O5 spheres (Nb2O5-NS) and Nb2O5 nanoparticles supported on holey graphene oxide (Nb2O5-hGO). a SEM (scale bar 100 nm) and b TEM (scale bar 500 nm) images of Nb2O5-NS. c Overview (scale bar 200 nm) and d HRTEM (scale bar 10 nm) of Nb2O5-hGO
