Fabrication and characterization of titania nanotube/cobalt sulfide supercapacitor electrode in various electrolytes

Abstract

A facile electrochemical technique has been employed to fabricate titania nanotube (T-NT)/cobalt sulfide (CoS) composite electrode for high performance supercapacitor application. The morphology and phase evaluation of the electrode were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. The pseudocapacitance behavior of the T-NT/CoS composite electrode has been evaluated in four different aqueous electrolytes: KOH, KCl, Na 2 SO 4 and Na 2 SO 3. Cyclic voltammetric studies in aqueous KOH electrolyte indicated that a very high specific capacitance (370 F g-1) can be achieved in this electrolyte together with excellent cycle stability even after 300 consecutive CV cycles. Further, the capacitance behavior of the T-NT/CoS electrode in KCl, Na 2 SO 4 , and Na 2 SO 3 electrolytes exhibited a mixture of electric double layer (EDL) and redoxinduced supercapacitance as displayed in the cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopic (EIS) experiments. It was also observed that the capacitance behavior of the composite material is not greatly dependent on the electrolyte used

Growth and electrochemical performance of porous NiMn2O4 nanosheets with high specific surface areas

“…To further understand (d) Fig. 7 a, [30], ZnO@C [35], T-NT@CoS 2 [36], Ni 3 Si 2 /CNFS [37], and SiC@Ni(OH) 4 [38]. Furthermore, the capacitive performance of the NiMn 2 O 4 nanosheets is also superior to that of NiMn 2 O 4 -based electrodes with other morphology types or prepared by other methods [39,40].…”

Hierarchical ultrathin NiAl layered double hydroxide nanosheet arrays on carbon nanotube paper as advanced hybrid electrode for high performance hybrid capacitors

“…Supercapacitors (SCs), also called as electrochemical capacitors, have been well known for one promising energy storage device due to the high power density, fast charge/discharge capability, long lifespan, and low maintenance cost [1][2][3][4]. With these encouraging features, SCs has been adopted widely in many fields where high power density and long cycling stability are highly desirable [5,6].…”

Enhanced cycling stability of NiCo2S4@NiO core-shell nanowire arrays for all-solid-state asymmetric supercapacitors

“…Recently, metal sulfides such as Ni 3 S 2 1112, CoS13 and MoS 2 14 have been applied to pseudocapacitors as promising electrode materials owing to their great electrochemical performance like high reversible capacity and good electrical conductivity synergistically. Among them, NiCo 2 S 4 is outstanding owing to its higher reversible capacity, richer redox reactions and more sensitive electrical conductivity than the other metal sulfides1516.…”