Novel Sn Doped Co₃O₄ Thin Film for Nonenzymatic Glucose Bio‐Sensor and Fuel Cell

Abstract

Abstract A facile chemical solution deposition via two‐step spin coating technique was used to fabricate nano‐particulate novel Sn doped Co 3 O 4 thin film for glucose sensor and fuel cell applications. Substitution of Sn into Co 3 O 4 host lattice lead to a remarkable increase in the electrocatalytic activity of the Co 3 O 4 electrode material. Film thickness played a significant role in enhancing the charge transferability of the electrode as was observed from electrochemical impedance spectroscopy (EIS). The best sensor exhibited two wide linear response ranges (2 μM up to ∼0.5 mM and 0.6 mM up to ∼5.5 mM respectively) with sensitivities of 921 and 265 μA cm −2 mM −1 respectively and low limit of detection of 100 nM (S/N=3). The sensor was very selective towards glucose in the presence of various interference and showed long term stability. Moreover, the developed thin film modified electrode could generate one electron current in nonenzymatic fuel cell setup at room temperature.