Issue 12, 2014

MnCO3: a novel electrode material for supercapacitors

Abstract

In this manuscript, MnCO3 is introduced as a novel electrode material for supercapacitors. MnCO3 was synthesized by a hydrothermal method using KMnO4 and commercial sugar as precursors. The synthesized product was characterized by powder X-ray diffraction, SEM, TEM and Raman spectroscopic studies. Rietveld refinement of powder X-ray diffraction confirmed the formation of a pure phase of MnCO3. Microscopic studies revealed particles of different shapes with sizes varying from 0.1 to 0.3 μm. Elemental mapping demonstrated a uniform distribution of manganese, carbon, and oxygen and there are no other impurity elements observed. The capacitive storage performance of MnCO3 was evaluated in three different electrolytes, namely, 0.1 M Na2SO4, 0.1 M Mg(ClO4)2 and 6 M KOH by cyclic voltammetry and galvanostatic charge–discharge cycling. A high specific capacitance of 216 F g−1 was obtained at a high loading level of 1.5 mg cm−2 for submicron sized particles of MnCO3 in a 0.1 M Mg(ClO4)2 electrolyte. Good reversibility, high coulombic efficiency, respectable rate performance and long cycle-life are also reported for MnCO3. This study opens up ample avenues to explore a new class of carbonate based materials for supercapacitor applications.

Graphical abstract: MnCO3: a novel electrode material for supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
17 Oct 2013
Accepted
03 Jan 2014
First published
06 Jan 2014

J. Mater. Chem. A, 2014,2, 4276-4281

MnCO3: a novel electrode material for supercapacitors

S. Devaraj, H. Y. Liu and P. Balaya, J. Mater. Chem. A, 2014, 2, 4276 DOI: 10.1039/C3TA14174H

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