Higher catalytic activity of porphyrin functionalized Co3O4 nanostructures for visual and colorimetric detection of H2O2 and glucose

5,10,15,20-Tetrakis(4-carboxyl phenyl)-porphyrin functionalized Co3O4 nanocomposites (H2TCPP-Co3O4 NCs) were demonstrated to exhibit more excellent intrinsic peroxidase-like activity with higher catalytic activity than that of pure Co3O4 NPs and the sensitive detection limit for glucose determination was as low as 8.6 × 10− 7 M.