Electrodeposited cobalt hexacyanoferrate electrode as a non-enzymatic glucose sensor under neutral conditions

A CoFe Prussian blue analogue (CoFe PB) modified FTO electrode, prepared via a facile electrodeposition method, is investigated as a non-enzymatic glucose sensor under neutral conditions. The electrode exhibits a linear detection of glucose in the 0.1–8.2 mmol/L range with a detection limit of 67 μM, a sensitivity of 18.69 μA/mM.cm2, and a fast response time of less than 7 s under neutral conditions. Its stability is confirmed with both electrochemical experiments and characterization studies performed on the pristine and post-mortem electrode. We also conducted a comprehensive electrochemical analysis to elucidate the identity of the active site and the glucose oxidation mechanism on the Prussian blue surface. [Display omitted] •Cobalt Hexacyanoferrate was electrodeposited on FTO electrode.•CoFe electrode exhibits high electrocatalytic activity for glucose oxidation under neutral conditions.•Glucose oxidation mechanism involves the coordination of cobalt sites to the HO–C1 group of the glucose molecule.