Issue 7, 2020

Tuning the morphology of manganese oxide nanostructures for obtaining both high gravimetric and volumetric capacitance

Abstract

Obtaining both high gravimetric capacitance (Cs_m) and high volumetric capacitance (Cs_V) in supercapacitors is still a great challenge. We prepared manganese oxide (MO) nanostructures by pulsed laser deposition, using a metallic Mn target in an O2 atmosphere with pressures ranging from 0.1 Torr to 2.0 Torr at room temperature. The morphology gradually changed from a dense film to nanofoam with different porosities and densities. Raman spectroscopy and X-ray photoelectron spectroscopy revealed a similar oxidation state despite distinct microstructures. Cs_m and Cs_V for the three typical nanostructures, namely thin films, perpendicular columnar structures and nanofoams, were compared. It was found that the highest Cs_m value was not obtained in the nanofoam sample with the highest porosity, but it was achieved in the sample with a perpendicular columnar structure with a Cs_m value of 976 F g−1 at 5 mV s−1. Such a configuration showed the highest Cs_V as well with a value of 830 F cm−3 at 5 mV s−1. The best performance with voltage scan rates higher than 50 mV s−1 was found in the nanofoam structures with the values of 612 F g−1 at 100 mV s−1 and 352 F g−1 at 300 mV s−1. Our research gives useful suggestions for material design in supercapacitor electrodes: a suitable microstructure can be used for applications focusing on different parameters of a supercapacitor. The results might be of general interest for the energy storage research community.

Graphical abstract: Tuning the morphology of manganese oxide nanostructures for obtaining both high gravimetric and volumetric capacitance

Supplementary files

Article information

Article type
Paper
Submitted
20 Jul 2020
Accepted
02 Sep 2020
First published
02 Sep 2020
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2020,1, 2433-2442

Tuning the morphology of manganese oxide nanostructures for obtaining both high gravimetric and volumetric capacitance

J. D. A. Pereira, J. N. Lacerda, I. F. Coelho, C. D. S. C. Nogueira, D. F. Franceschini, E. A. Ponzio, F. B. Mainier and Y. Xing, Mater. Adv., 2020, 1, 2433 DOI: 10.1039/D0MA00524J

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