Hydrothermally obtained MoO 3 /reduced graphene oxide (RGO) hybrid registered a specific capacitance of 724 F g -1 at 1 A g -1 , superior to the supercapacitor performance obtained from similar hybrid structures. Density functional theory (DFT) simulations further corroborated our claim in terms of both enhanced quantum capacitance and relevant insight from the electronic density of states (DOS) for MoO 3 /RGO. Maximum capacitance is achieved for 12 wt % of RGO and then it reduces as observed in the experiment. The appearance of additional density of states from the C p z orbital in the band gap region near the Fermi level on introduction of RGO in MoO 3 is responsible for the enhanced capacitance in MoO 3 /RGO.
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 mAmM À1 cm À2 in the 5-110 mM 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 mF/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.
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