Multifunctional Porous CoFe₂O₄ Tubular Catalyst for Glucose and H₂O₂ Detection

In biosensors, the development of low-cost, high-sensitivity catalysts for glucose and hydrogen peroxide (H₂O₂) detection has broad research prospects. Herein, porous CoFe₂O₄ nanotubes (p-CFONTs) were synthesized by an electrospinning technique and subsequent calcination. As a catalyst in biosensors, p-CFONTs exhibit high catalytic activity towards glucose and H₂O_2. In detail, p-CFONT-modified nickel foam exhibits a high sensitivity to glucose of 1170 μA cm⁻² mmol L⁻¹ and a low detection limit of 9.7 μmol L⁻¹ in a wide linear range from 20 μmol L⁻¹ to 4.0 mmol L⁻¹. In the case of H₂O₂ sensors, p-CFONT-modified electrodes show a high sensitivity of 478 μA cm⁻² mmol L⁻¹ and a low detection limit of 230 μmol L⁻¹ in a wide linear response of 0.5 mmol L⁻¹ to 22.5 mmol L⁻¹. The good sensing performance for glucose and H₂O₂ of p-CFONT-modified electrodes is attributable to the porous and hollow structure of p-CFONTs. This work has guiding significance for the design of multifunctional electrodes in nonenzymatic glucose and H₂O₂ sensors.