High-performance binder-free supercapacitor electrode by direct growth of cobalt-manganese composite oxide nansostructures on nickel foam.

Shulan Jiang,Yongming Sun,Tielin Shi,Zirong Tang,Wei Zhou,Hu Long

doi:10.1186/1556-276x-9-492

Shulan Jiang, Yongming Sun + Show 4 more

Open Access

https://doi.org/10.1186/1556-276x-9-492

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Abstract

A facile approach composed of hydrothermal process and annealing treatment is proposed to directly grow cobalt-manganese composite oxide ((Co,Mn)3O4) nanostructures on three-dimensional (3D) conductive nickel (Ni) foam for a supercapacitor electrode. The as-fabricated porous electrode exhibits excellent rate capability and high specific capacitance of 840.2 F g-1 at the current density of 10 A g-1, and the electrode also shows excellent cycling performance, which retains 102% of its initial discharge capacitance after 7,000 cycles. The fabricated binder-free hierarchical composite electrode with superior electrochemical performance is a promising candidate for high-performance supercapacitors.

Highlights

Due to the depletion of fossil fuels and increasingly serious environmental pollution, there has been an urgent demand for advanced and high-performance energy storage devices to satisfy the needs of modern society and emerging ecological concerns [1,2]
Efforts have been devoted to the study of Co-Mn oxide structures as supercapacitor electrode materials [21,24,27,28,29]
We chose the samples obtained by the process with the addition of 0.444 g NH4F for further study in this work, and SEM images of the nanostructure with different magnifications are shown in Figure 1d,e, respectively

Summary

Introduction

Due to the depletion of fossil fuels and increasingly serious environmental pollution, there has been an urgent demand for advanced and high-performance energy storage devices to satisfy the needs of modern society and emerging ecological concerns [1,2]. Simple binary metal oxide materials such as manganese dioxide (MnO2) [7,8,9], cobaltosic oxide (Co3O4) [10,11], nickel oxide (NiO) [12,13], and ruthenium oxide (RuO2) [14,15] have been widely studied as supercapacitor electrodes and show good electrochemical performance. Ternary Co-Mn oxides have been widely studied as lithium-ion battery electrodes in recent reports [22,23,25,26], which demonstrates excellent electrochemical performance. Co-Mn composite oxide structures have been fabricated through the thermally decomposing method [28] or electroless electrolytic technique [29], showing improved electrochemical performance compared with the pure MnCo2O4 and MnCo2O4.5 nanostructures

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Results

Conclusion