Duality application analysis of bismuth vanadate (BiVO4) as non-enzymatic glucose sensor and supercapacitor

Abstract

Bismuth vanadate was synthesized using the hydrothermal method, with its monoclinic scheelite phase structure was confirmed by XRD. Its morphology and elemental composition confirmed by HR-SEM and XPS studies. To evaluate its efficiency in glucose sensing, cyclic voltammetry and chronoamperometry studies was used, revealing effective glucose detection with minimal interference. From the cyclic voltammetry result, it is observed that the addition of glucose resulted in a corresponding anodic peak, reflecting the oxidation of glucose. From the Chronoamperometry study, sensitivity was found to be 1.07 mA/mM cm² for a linear range of 1 mM to 8 mM, and a limit of detection was found to be 0.12 µM. In addition, Supercapacitive performance of bismuth vanadate was also evaluated in NaOH and KOH electrolytes. It shows maximum capacitance of 423.75F/g for NaOH than KOH electrolyte (361.25F/g). Capacitance was calculated from CV and GCD measurements, and cyclic stability test showed 5000 continuous charge–discharge cycles. Thus, monoclinic scheelite bismuth vanadate demonstrates potential for both glucose sensing and supercapacitor applications.