Electrochemical Behaviour of Lithium, Sodium and Potassium Ion Electrolytes in a Na_0.33V₂O₅ Symmetric Pseudocapacitor with High Performance and High Cyclic Stability

Abstract

A high-performance symmetric supercapacitor was fabricated using a Na 0.33 V 2 O 5 nanocomposite synthesized by means of a simple co-precipitation technique. The structural and morphological investigation showed that the synthesized Na 0.33 V 2 O 5 nanocomposite exhibited a monoclinic structure with a nanorod-like morphology. The electrochemical properties of the Na 0.33 V 2 O 5 symmetric supercapacitor were studied utilizing three different aqueous electrolytes, such as 1 M of LiCl , NaCl and KCl, respectively. Interestingly, the fabricated Na 0.33 V 2 O 5 symmetric supercapacitors exhibited excellent electrochemical capacitance behaviour in all the electrolytes with a maximum specific capacitance value of 168 F g À1 in 1 M LiCl, 146 F g À1 in 1 M NaCl and 132 F g À1 in 1 M KCl electrolytes at 0.5 A g À1 discharge current density. In addition, Na 0.33 V 2 O 5 symmetric supercapacitors demonstrated an excellent cyclic stability in 1 M NaCl electrolyte with high capacitance retention of approximately 81 % after 50 000 charge/discharge cycles.

Surface‐Engineered Black Niobium Oxide@Graphene Nanosheets for High‐Performance Sodium‐/Potassium‐Ion Full Batteries

“…To further confirm the black Nb 2 O 5− x @rGO nanosheets as an anode material for practical SIB and PIB applications, full batteries with the black Nb 2 O 5− x @rGO nanosheets' anodes and vanadate‐based cathodes are constructed. Sodium vanadate (Na 0.33 V 2 O 5 ) and potassium vanadate (K 0.5 V 2 O 5 ) are used as cathodes for Na‐ion and K‐ion full batteries, respectively . Morphology, crystallinity, and electrochemical characterization of the Na 0.33 V 2 O 5 and K 0.5 V 2 O 5 cathodes are shown in Figure S9 (Supporting Information).…”

Electrospun Carbon Nanofibers Encapsulated with NiCoP: A Multifunctional Electrode for Supercapattery and Oxygen Reduction, Oxygen Evolution, and Hydrogen Evolution Reactions

“…[16,36,37] The collective CV curves of both negative and positive electrode are shown in Figure 7a to hone the working potential of the device. [54][55][56][57][58][59][60][61][62][63] The specific capacity of the device calculated from the CV and GCD curves are 155 F g −1 at 1 mVs −1 and 161 C g −1 at 1.5 A g −1 , correspondingly. Therefore, the mass of the negative electrode material was adjusted with that of the positive electrode correspondingly.…”

“…Compared to state of the art, the cell voltage of 1.6V attained by the fabricated symmetric device seems to be higher than the reported symmetric systems of NiCo 2 S 4 @CNFs (0.5V), [20] N and S codoped activated corncob sponge (1 V), [54] Inner porous carbon nanofibers (1 V), [55] carbon black@CNF/PANI (0.5 V), [56] RuO 2 / porous carbon (1.2 V), [57] CuCo 2 O 4 (1.2 V), [58] danthron functionalized reduced graphene oxide nanosheets (DT-RGNs) (1.1V), [59] Na 0.33 V 2 O 5 (0.8V), [60] and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)-coated polyvinylidene fluoride-tetrafluoroethylene nanofiber (0.85V). [61] Subsequently, the energy density and power density of the fabricated device is comparatively higher than the above reported symmetric devices.…”

“…Concurrently, the existence CNF empowers the formation of double-layered capacitance resulting in improved charge storage capacity. [19][20][21][54][55][56][57][58][59][60][61]63] The Nyquist plot of the symmetric supercapattery ( Figure S6, Supporting Information) shows impedance spectra of the device before and Adv. Scheme 3 exemplifies the intricate charge/discharge mechanism performed by the assembled device with respect to the applied potential.…”

Vanadium Pentoxide with H2O, K+, and Na+ Spacer between Layered Nanostructures for High‐Performance Symmetric Electrochemical Capacitors

“…Moreover, the high binding energy peak at 533.4 eV is associated with the chemisorbed or surface-bound H 2 O molecules. The binding energy of Na 1s was found to be 1071 eV [50] and NVO sample possess ≈0.38% of sodium atoms. In KVO (Figure 4f), the additional peaks at 292.5 and 295.6 eV characterize the spin-orbit doublet 2p 3/2 and 2p 1/2 of K + (K 2p) cations.…”