Hollow mesoporous CuCo2O4 microspheres derived from metal organic framework: A novel functional materials for simultaneous H2O2 biosensing and glucose biofuel cell

Hollow mesoporous CuCo2O4 (meso-CuCo2O4) microspheres were successfully synthesized by decomposing metal-organic frameworks (MOFs) as the template. The as-prepared CuCo2O4 microspheres were first simultaneously used for H2O2 biosensing and glucose biofuel cell (GFC) as the enzyme mimic. The resulting of meso-CuCo2O4 displayed not only excellent catalytic performances to H2O2 including a super-fast response time (within 2 s), a super-high sensitivity (654.23 pA mM(-1) cm(-2)) and a super-low detection limit (3 nM at S/N = 3) on the sensor, but also great values in GFC as anode material with an open circuit voltage of 0.85 V, a maximum power density of 0.33 mWcm(-2) and a limiting current density of 1.27 mAcm(-2), respectively. The preeminent catalytic abilities to H2O2 and glucose may be attributed to the surpassing intrinsic catalytic activity of CuCo2O4 and large specific area of mesoporous structure. These significant findings deriving from this work not only provided a novel exploration for the fabrication of hollow spherical mesoporous bimetallic oxides, but also promoted the development of the supersensitive detection of H2O2 and non-enzymatic biofuel cell.