Fig. 2From: Sensitive Nonenzymatic Electrochemical Glucose Detection Based on Hollow Porous NiOa–c SEM and d, e TEM images of NiO HPA. f The HRTEM image of NiO HPA. g The STEM and EDX mapping images of a NiO HPA cube. h The line-scan EDX spectra of a NiO HPA cubeBack to article page