Facile synthesis of CoCo2O4/rGO spinel nanoarray as a robust electrode for energy storage devices

Facile synthesis of CuCo2O4 spinel with rGO nanocomposite via hydrothermal approach for solid state supercapacitor application

In this work, strontium molybdenum oxide (SrMoO4) is reported as electrode material for supercapacitors (SCs). The physico-chemical properties of SrMoO4 were investigated and tested for capacity performance by employing cyclic voltammetry (CV), chronopotentiometry (CP), and electrochemical impedance spectroscopy (EIS). SrMoO4 showed significant specific capacity of 384 C g-1 at 5 mVs-1 with good cyclic stability and capacity retention of 91.5% upto 3000 GCD cycles at current density 1 Ag-1. Also, the as-fabricated SrMoO4 showed the coulombic efficiency and energy efficiency of 81.2% and 82.6% respectively over 5000 GCD cycles. The substantial by active surface area and increased abundance of reactive sites, revealed by the morphological analysis contributed for the higher specific capacity. The lowest values of Rs and Rct exhibited by SrMoO4 such as 2.21 Ω and 1.31 Ω, respectively predicted the faster reaction kinetics. Furthermore, symmetric supercapacitor device was also assembled and it exhibited a wide operating voltage window of 1.6 V, with an energy density of 67.3 Wh kg-1 at a power density of 3150 Wkg-1. The pseudocapacitive performance of SrMoO4 was attributed to its unique structure, which enabled fast ion /electron transport and low solution resistance. The electrochemical results demonstrated that SrMoO4 could be utilized as electro-active material for SCs. 

Electrochemical Performance of SrMoO4 as Electrode Material for Energy Storage Systems

A straightforward wet chemical technique was employed to design and synthesize microstructured SbVO4, and its structural and surface morphological properties were examined using various analytical techniques. The electrochemical performance of SbVO4 NPs was studied using chronopotentiometry, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The electrode exhibits a specific capacitance (Csp) of 384 Fg−1 at 5 mVs−1, showcasing rapid Faradic redox reactions and efficient charge transfer even at higher scan rates. The relationship between scan rates, Csp, and current densities reveals promising kinetics, with the Csp increasing as the scan rate decreases. The SbVO4 electrode maintains a high capacitance retention of 91 % after 6000 GCD cycles, highlighting exceptional cycling stability. The SbVO4//AC asymmetric device, constructed to assess practicality, displays distinct CV profiles and remarkable reversibility at various scan rates. The device achieves a Csp of 62 Fg−1 at 1 Ag−1, with 84 % capacitance retention after 5000 GCD cycles. A Ragone plot illustrates the device's energy density of 22.04 Whkg−1 and power density of 793.4 Wkg−1, affirming the effectiveness of SbVO4//AC as a robust electrode material for SCs in practical applications. 

Antimony vanadate spheres: Synthesis, characterizations, and use as positive electrode in asymmetric supercapacitor systems

Metal tungstates nanostructures for supercapacitors: A review

Increasing demand for electronic devices has sparked quantum of research work on energy storage systems. In the present work, we report the facile synthesis of platelet‐like Zirconium tungstate (ZrW2O8 NPs) binary metal oxide via co‐precipitation method. The ZrW2O8 NPs was confirmed by several physicochemical techniques. Furthermore, FESEM images proved the platelet‐like morphology of ZrW2O8 NPs. The as‐prepared ZrW2O8 NPs was used as electrode material in the fabrication of supercapacitors. ZrW2O8 NPs @ Ni foil shows the specific capacitance (Csp) maximum of 508 F g−1 at 5 mV/s and showed 91.3% of cyclic stability after 4000 GCD cycles. As a result, ZrW2O8 NPs was utilized as an anode electrode material to construct an asymmetric device, ZrW2O8 NPs || Activated carbon (AC). The as‐fabricated device showed the energy density of 9.65 Wh kg−1 related to the power density of 299.48 W kg−1. The effective supercapacitive behavior might be due to the unique morphological features, occurrence of multiple redox sites, and enhanced electrical conductivity of ZrW2O8 NPs. Thus, all these findings account for the applicability of ZrW2O8 NPs as electrode material in high‐performance supercapacitors.

Facile synthesis of platelet‐like zirconium tungstate nanostructures for high‐performance supercapacitors

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Facile synthesis of platelet‐like zirconium tungstate nanostructures for high‐performance supercapacitors

Antimony vanadate spheres: Synthesis, characterizations, and use as positive electrode in asymmetric supercapacitor systems