Fabrication of hierarchical core/shell MgCo2O4@MnO2 nanowall arrays on Ni-foam as high\u2013rate electrodes for asymmetric supercapacitors

Jiasheng Xu,Lin Wang

doi:10.1038/s41598-019-48931-6

Jiasheng Xu, Lin Wang

Open Access

https://doi.org/10.1038/s41598-019-48931-6

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Journal: Scientific Reports	Publication Date: Aug 29, 2019
Citations: 35	License type: open-access

Affiliation: Liaoning Shihua University, Bohai University

Abstract

Design and fabrication of a hierarchical core/shell MgCo2O4@MnO2 nanowall arrays on Ni-foam by a facile two-step hydrothermal method. The electrochemical measurements prove these composites with MnO2 definitely offer better supercapacitive performance of the MgCo2O4 electrode material. The nanowall structure provides more active sites and charge transfer during the Faradic reaction. The MgCo2O4@MnO2 nanowall shows an excellent electrochemical performance (852.5 F g−1 at 1 A g−1). The asymmetric supercapacitor is composed of the MgCo2O4@MnO2 nanowall and the activated carbon (AC). The energy densities of the asymmetric supercapacitor device can keep up 67.2 Wh·kg−1 at 5760.0 W·kg−1. The MgCo2O4@MnO2 nanowall shows excellent supercapacitive performance and has a great potential for more research and application in the asymmetric supercapacitor devices field.

Highlights

With the increase of environmental pollution and the growing energy consumption, the research on new energy and energy storage device is very urgent[1,2,3]
After the first hydrothermal reaction, Mg ions react with Co ions to form a pink MgCo2O4 nanowall arrays (MCNA) layer on Ni-foam
The MnO2 sheets are grown on the ordered MCNA in the second hydrothermal reaction

Summary

Introduction

With the increase of environmental pollution and the growing energy consumption, the research on new energy and energy storage device is very urgent[1,2,3]. The core/shell MgCo2O4@MnO2 nanowall arrays (MCMNA) on Ni-foam were prepared via two steps of hydrothermal reaction.

Results

Conclusion