Nanoflake NiMoO4 based smart supercapacitor for intelligent power balance monitoring

Abstract

A supercapacitor is well recognized as one of emerging energy sources for powering electronic devices in our daily life. Although various kind of supercapacitors have been designed and demonstrated, their market aspect could become advanced if the utilisation of other physicochemical properties (e.g. optical) is incorporated in the electrode. Herein, we present an electrochromic supercapacitor (smart supercapacitor) based on a nanoflake NiMoO 4 thin film which is fabricated using a facile and well-controlled successive ionic layer adsorption and reaction (SILAR) technique. The polycrystalline nanoflake NiMoO 4 electrode exhibits a large electrochemically active surface area of ~ 96.3 cm 2. Its nanoporous architecture provides an easy pathway for the intercalation and de-intercalation of ions. The nanoflake NiMoO 4 electrode is dark-brown in the charged state and becomes transparent in the discharged state with a high optical modulation of 57 %. The electrode shows a high specific capacity of 1853 Fg-1 at a current rate of 1Ag-1 with a good coloration efficiency of 31.44 cm 2 /C. Dynamic visual information is obtained when the electrode is charged at different potentials, reflecting the level of energy storage in the device. The device retains 65% capacity after 2500 charge-discharge *Manuscript Click here to view linked References 2 cycles compared with its initial capacity. The excellent performance of the nanoflake NiMoO 4 based smart supercapacitor is associated with the synergetic effect of nanoporous morphology with a large electrochemically active surface area and desired chemical composition for redox reaction.

Recent Trends in Bimetallic Oxides and Their Composites as Electrode Materials for Supercapacitor Applications

“…The electrode material can generate an ED of 117 Wh kg À 1 at a PD of 7527 W kg À 1 . [107] FeMoO 4 shows a high specific capacity of 158.39 mA h g À 1 at 2 A g À 1 with a cyclic stability of 92.37 % after 4000 cycles, the electrode material shows a honeycomb-like morphology. [108] MnMoO 4 shows a specific capacitance of 215 F g À 1 at a current density of 1 mA cm À 2 with a low internal resistance of 0.65 ohm.…”

Electrochemical Supercapacitors: From Mechanism Understanding to Multifunctional Applications

“…[ 61 ] Thus, the charge/discharge state of SC‐EC device can be visually inspected based on the color. [ 61 ] SC‐EC bifunctional cells based on WO 3 quantum dots, [ 122 ] other metal oxides including NiO, [ 123 ] NiMoO 4 , [ 124 ] and V 2 O 5 , [ 125 ] or conducting polymers [ 126 ] have also been reported. Instead of relying on rigid FTO/ITO glass‐based substrate, mechanically deformable SC‐EC devices have also been achieved by adoption of different conductive substrates.…”

Graphitic Carbon Nitride Doped Copper–Manganese Alloy as High–Performance Electrode Material in Supercapacitor for Energy Storage

“…The EIS study was carried out to determine the kinetic criterion of the gCN, Cu 2 O-gCN, and CuMnO 2 -gCN incorporated materials on a frequency scale from 3 MHz to 10 Hz at open-circuit voltages (Figure 7d). The Nyquist designs of the three-electrode elements are made of the slanted semicircles within the high-frequency range and vertical shapes during the low-frequency section, which represents frontier charge-transfer resistance (R ct ) and dissemination resistance into the electroactive substance, sequentially [57,58]. The R ct outcome is 86.9, 90.1, and 22.9 Ω aimed at the gCN,…”