Porous Co3O4 hollow nanododecahedra for nonenzymatic glucose biosensor and biofuel cell

Cobalt oxide hollow nanododecahedra (Co 3 O 4 -HND) is synthesized by a facile thermal transformation of cobalt-based metal-organic framework (Co-MOF, ZIF-67) template. The morphology and properties of the Co 3 O 4 -HND are characterized by a set of techniques, including transmission electron microscope (TEM), powder X-ray diffraction (XRD), scanning electron microscope (SEM) and Brunner–Emmet–Teller (BET). When tested as a non-enzymatic electrocatalyst for glucose oxidation reaction , the Co 3 O 4 -HND exhibits a high activity and shows an outstanding performance for determining glucose with a wide window of 2.0   μM to 6.06   mM, a high sensitivity of 708.4   μA   mM −1   cm −2 , a low detection limit of 0.58   μM ( S / N =3), and fast response time(<2   s). Based on the nonenzymatic oxidation of glucose, Co 3 O 4 -HND could be served as an attractive non-enzyme and noble-metal-free electrocatalyst in glucose fuel cell (GFC) due to its excellent electrochemical properties, low cost and facile preparation.