Porous nanocubic Mn3O4–Co3O4 composites and their application as electrochemical supercapacitors

Abstract

A simple approach has been developed to fabricate ideal supercapacitors based on porous Mn(3)O(4)-Co(3)O(4) nanocubic composite electrodes. We can easily obtain porous corner-truncated nanocubic Mn(3)O(4)-Co(3)O(4) composite nanomaterials without any subsequent complicated workup procedure for the removal of a hard template, seed or by using a soft template. In such a composite, the porous Mn(3)O(4)-Co(3)O(4) enables a fast and reversible redox reaction to improve the specific capacitance. The porous nanocubic Mn(3)O(4)-Co(3)O(4) composite electrode can effectively transport electrolytes and shorten the ion diffusion path, which offers excellent electrochemical performance. These results suggest that such porous Mn(3)O(4)-Co(3)O(4) composite nanocubes are very promising for next generation high-performance supercapacitors.

In situ fabrication of porous festuca scoparia-like Ni0.3Co2.7O4 nanostructures on Ni-foam: An efficient electrode material for supercapacitor applications

“…The other important aspect of these oxides is the accessibility of multiple oxidation states of the metal ions during the redox transitions. Based on the knowledge gained on the mono-metal oxides, mixed-transition metal oxides (MTMOs) such as NiCo 2 O 4 [33e36], NiMn 2 O 4 [37], NiFe 2 O 4 [38], MnCo 2 O 4 [39,40], CoMoO 4 [41] Mn 3 O 4 eCo 3 O 4 [42], TiO 2 eMnO 2 [43] have been synthesized and found to be effective electrode materials for electrochemical supercapacitors [44]. The MTMOs can significantly improve the supercapacitor performance in terms of short electron and ion transport pathways, high surface area, controllable morphology, better electronic conductivity and redox behavior owing to the synergistic effect.…”

Amorphous Ni–Co Binary Oxide with Hierarchical Porous Structure for Electrochemical Capacitors

“…7,8 Amongst those transition metal elements, due to the high redox activity, and environmentally benign nature, Ni or Co based materials (oxides or hydroxides) are considered to be admirable candidates of pseudocapacitance electrode materials, consequently, those two transition metal oxides or hydroxides gradually become the emphasis of pseudocapacitors study. 9,10 Moreover, some researchers also devote to consider using composite oxides as the electrode materials of supercapacitors or lithium-ions batteries, such as Ni-Co [11][12][13][14][15][16] , Ni-Mn 17, 18 , Co-Mn 19,20 , Fe-Ni 21,22 , Ni-Sn 23,24 , Mn-Fe 25 oxides.…”

Hybrid nanostructured C-dot decorated Fe3O4electrode materials for superior electrochemical energy storage performance

“…Transitional metal oxides like RuO 2 , Co 3 O 4 , NiO, Fe 2 O 3 , MnO 2 , etc have been widely used and accepted as supercapacitor materials, owing to their large capacitance and fast redox kinetics [9][10][11][12][13][14]. Recently, Fe 3 O 4 based supercapacitor electrodes have attracted significant attention because of their easy redox reaction, low cost and less environmental impact [15][16][17].However, poor conductivity of Fe 3 O 4 poses as a major hindrance for its application as supercapacitor electrodes.…”