Electrodeposition of spinel MnCo₂O₄nanosheets for supercapacitor applications

Abstract

Herein, we report a facile, low-cost and one-step electrodeposition approach for the synthesis MnCo2O4 (MCO) nanosheet arrays on indium doped tin oxide (ITO) coated glass substrates. The crystalline phase and morphology of the materials are studied by x-ray diffraction, energy dispersive x-ray analysis and field-emission scanning electron microscopy. The supercapacitor performance of the MCO nanosheets are studied in a three-electrode configuration in 2 M KOH electrolyte. The as-prepared binder-free electrode shows a high specific capacitance of 290 F g(-1) at 1 mV s(-1) with excellent cyclic stability even after 1000 charge/discharge cycles. The obtained energy density and power density of the MCO nanosheets are 10.04 Wh kg(-1) and 5.2 kW kg(-1) respectively. The superior electrochemical performances are mainly attributed to its nanosheet like structure which provides a large reaction surface area, and fast ion and electron transfer rate.

Facile synthesis of maguey-like CuCo2O4 nanowires with high areal capacitance for supercapacitors

“…However, the use of conducting additive and binder unavoidably increases the undesirable interparticle resistance which decreases the efficiency of electron transport among active materials. Comparing to the powder electrode, it was shown that direct growth of electrode materials arrays on conductive substrates [29][30][31][32][33] could conquer the shortcoming compared to the power electrode. For example, CuCo 2 O 4 nanograss on a Cu foam substrate has hold specific capacitances of 796 F g -1 at 2 A g -1 [17].…”

Hierarchical MnCo2O4/NiMn Layered Double Hydroxide Composite Nanosheet Arrays on Nickel Foam for Enhanced Electrochemical Storage in Supercapacitors

“…Rout et al. fabricated MnCo 2 O 4 NAs achieving a capacitive value of 290 F g −1 at 1 mV s −1 . Our group also reported the synthesis of flower‐like MnCo 2 O 4 microspheres having a specific capacitance of 539 F g −1 at 1 A g −1 .…”

“…Among these, MnCo 2 O 4 is a very attractive SCs electrode material because of its ultrahigh theoretical specific capacitance (3620 F g −1 ) and desirable physicochemical and electrochemical performance. To date, different MnCo 2 O 4 micro‐/nanostructures such as nanowires, nanofibers, nanoneedle, nanosheets, and flower‐like microspheres have been reported to demonstrate different capacitive performance . For instance, Yuan et al.…”

“…To date, different MnCo 2 O 4 micro-/nanostructures such as nanowires, nanofibers, nanoneedle, nanosheets, and flower-like microspheres have been reported to demonstrate different capacitive performance. [10][11][12][13][14][15] For instance, Yuan et al synthesized MnCo 2 O 4 porous nanowires that exhibited a specific capacitance of 1342 F g À 1 at 1 A g À 1 . [11] Rout et al fabricated MnCo 2 O 4 NAs achieving a capacitive value of 290 F g À 1 at 1 mV s À 1 .…”

Tunability of Porous CuCo2O4 Architectures as High‐Performance Electrode Materials for Supercapacitors

“…On the other hand, mixed metal oxide spinels are considered as a potential candidate on account to their higher electrochemical activity, electronic conductivity and low environmental impact . There is an extensive research on the mixed metal oxide spinels used for supercapacitors including metal ferrite, metal manganite; CoFe 2 O 4 , ZnFe 2 O 4 , CuFe 2 O 4 , NiFe 2 O 4 , CoMn 2 O 4 , NiMn 2 O 4 , ZnMn 2 O 4 , and metal cobaltite; NiCo 2 O 4 , MgCo 2 O 4 , ZnCo 2 O 4 , FeCo 2 O 4 , MnCo 2 O 4 and CuCo 2 O 4 , However, the metal cobaltite spinels have drawn as the potential candidate to make active materials for the supercapacitors applications with low cost.…”