Performance Evaluation of Graphene Oxide Based Co₃O₄@GO, MnO₂@GO and Co₃O₄/MnO₂@GO Electrodes for Supercapacitors

Abstract

Hydrothermally synthesized electrodes of Co 3 O 4 @GO, MnO 2 @GO and Co 3 O 4 /MnO 2 @GO were produced for usages in supercapacitors. Graphene oxide (GO) was incorporated in the nanocomposites used for electrodes synthesis due to its great surface area and electrical conductivity. The synergistic alliance among these composites and GO enhance electrodes performance, life span and stability. The structural properties as obtained from the X-ray diffraction (XRD) results suggest that nanocomposites are crystalline in nature. The morphological studies indicated that the nanocomposites have platelet nanoparticles with some agglomerations. The energy bandgaps estimated for the Co 3 O 4 @GO, MnO 2 @GO and Co 3 O 4 /MnO 2 @GO are 2.38 eV, 2.05 eV and 2.33 eV respectively The electrochemical studies provided highest specific capacitance from CV using 10 mV/s scan rates and GCD using 1.0 A/g current density were 765, 1215, 1518 and 975, 1358, 1718 F/g for Co 3 O 4 @GO, MnO 2 @GO and Co 3 O 4 /MnO 2 @GO respectively. These results obviously indicate that composites perform better than single transition metal oxide and the addition of graphene oxide enhanced electrodes performance.

Decorating MnO2 nanosheets on MOF-derived Co3O4 as a battery-type electrode for hybrid supercapacitors

“…† The band at 3410 cm −1 indicates the O–H stretching of water, whereas the weak band at 1647 cm −1 is associated with the O–H group of bending vibration in the molecule of absorbed water. 41 And the bands approximately at 1417 and 1090 cm −1 match the coordination of Co by the O–H. However, the prominent peaks at 592 cm −1 and 520 cm −1 are attributed to the stretching vibrations of M–O or M–O–M (M = Co, Mn).…”

Nitrogen-Doped Porous Core-Sheath Graphene Fiber-Shaped Supercapacitors

“…The electrochemical properties of GF, SG@GF, and NSG@GF were summarized in Figure 7 . Figure 7 a shows the CV curves at 5 mVs −1 for GF and SG@GF, of which the shapes are nearly rectangular [ 40 ], indicating typical double-layer capacitance behavior [ 41 ]. The curve area of SG@GF is smaller than that of GF, indicating that pure SG coating deteriorates the electrochemical performance, which may be caused by dense SG coating and poor electrical conductivity.…”

A New CuSe-TiO2-GO Ternary Nanocomposite: Realizing a High Capacitance and Voltage for an Advanced Hybrid Supercapacitor

“…Still, the free-standing electrode shows unsatisfactory charge storage abilities, such as low capacitance and determined conductivity during the charge storage process [ 13 , 14 , 15 , 16 ]. So far, metal oxide (V 2 O 5 , Co 3 O 4 , SnO 2 , MnO 2 , CdO, and Fe 2 O 3 )/GO [ 8 , 17 , 18 , 19 , 20 , 21 ] composites have been researched and reported to solve the stability of active electrodes and hydrophilicity-related drawbacks. Meanwhile, metal sulfides (FeS 2 , NiCo 2 S 4 , VS 2 , SnS 2 , WS 2 , MoS 2 , NiS, Ni 3 S 2 , CuS, and ZnS) [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ] are also promising active materials for supercapacitors due to their high conductivity, suitable redox activities owing to multiple oxidation states, semiconducting behavior, and lower electronegativity.…”