Three-dimensional macroporous carbon/hierarchical Co3O4 nanoclusters for nonenzymatic electrochemical glucose sensor

•The 3D-KSCs/hierarchical Co3O4 nanoclusters integrated electrode was prepared.•The integrated electrode shows lots of needle-shaped and layered Co3O4 on 3D-KSC.•The integrated electrode shows large specific surface area and good electrical conductivity.•The integrated electrode shows superior performance for the detection of glucose.