Facile Hydrothermal Synthesis of MnWO4 Nanorods for Non‐Enzymatic Glucose Sensing and Supercapacitor Properties with Insights from Density Functional Theory Simulations

Abstract Here we report a facile and novel hydrothermal method to grow MnWO 4 nanorods and their electrochemical glucose sensing and supercapacitor properties have been investigated. MnWO 4 nanorods exhibited good glucose sensing performance with sensitivity of 13.7 μAμM −1 cm −2 in the 5–110 μM linear range and specific capacitance of 199 F/g at 2 mV/s and 256.41 F/g at 0.4 A/g. First principles simulations have also been carried out to qualitatively support our experimental observations by investigating the bonding and charge transfer mechanism of glucose on MnWO 4 through demonstration of Partial Density of States and charge density distributions. Large Density of States near Fermi level and empty d states around 2 eV above Fermi level of Mn d orbital qualify MnWO 4 as communicating media to transfer the charge from glucose by participating in the redox reactions. Insight into the electronic structure reveals that there is charge transfer from oxygen p orbital of glucose to d orbital of Mn. Also, the quantum capacitance of MnWO 4 electrodes has been presented to justify its supercapacitor performance. The maximum quantum capacitance of 762 μF/cm 2 is obtained which is mostly contributed by the d electrons of Mn. Our experimental data and theoretical insight strongly infer that MnWO 4 has the potential to be tailored as efficient and high‐performance glucose sensing and energy storage devices.