3D Graphene Frameworks/Co₃O₄ Composites Electrode for High‐Performance Supercapacitor and Enzymeless Glucose Detection

Abstract

3D graphene frameworks/Co₃ O₄ composites are produced by the thermal explosion method, in which the generation of Co₃ O₄ nanoparticles, reduction of graphene oxide, and creation of 3D frameworks are simultaneously completed. The process prevents the agglomeration of Co₃ O₄ particles effectively, resulting in monodispersed Co₃ O₄ nanoparticles scattered on the 3D graphene frameworks evenly. The prepared 3D graphene frameworks/Co₃ O₄ composites used as electrodes for supercapacitor display a definite improvement on electrochemical performance with high specific capacitance (≈1765 F g^-1 at a current density of 1 A g^-1 ), good rate performance (≈1266 F g^-1 at a current density of 20 A g^-1 ), and excellent stability (≈93% maintenance of specific capacitance at a constant current density of 10 A g^-1 after 5000 cycles). In addition, the composites are also employed as nonenzymatic sensors for the electrochemical detection of glucose, which exhibit high sensitivity (122.16 µA mM ^-1 cm^-2 ) and noteworthy lower detection limit (157 × 10^-9 M, S/N = 3). Therefore, the authors expect that the 3D graphene frameworks/Co₃ O₄ composites described here would possess potential applications as the electrode materials in supercapacitors and nonenzymatic detection of glucose.