Capacitive Properties of Mesoporous Mn-Co Oxide Derived from a Mixed Oxalate — Oak Academic Publishing
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Capacitive Properties of Mesoporous Mn-Co Oxide Derived from a Mixed Oxalate
School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Ma’anshan, China
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School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Ma’anshan, China
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School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Ma’anshan, China
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School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Ma’anshan, China
1 School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Ma’anshan, China
2 School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Ma’anshan, China
3 School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Ma’anshan, China
4 School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Ma’anshan, China
A mesoporous Mn-Co oxide for supercapacitors was derived from a mixed oxalate Mn 0.8 Co 0.2 C 2 O 4 ·nH 2 O, which was synthesized by a solid-state coordination reaction at room temperature. The synthesized mixed Mn-Co oxalate was decomposed in air at 250°C, resulting in a tetragonal spinel Mn-Co oxide with a primary particle size less than 100 nm. The obtained Mn-Co oxide presents a mesoporous texture with a specific surface area of 120 m 2 ·g ﹣1 . Electrochemical properties of the Mn-Co oxide electrode were investigated by cyclic voltammetry and galvanostatic charge/discharge in 6 mol·L ﹣1 KOH electrolyte. The Mn-Co oxide electrode delivered specific capacitances of 383 and 225 F·g ﹣1 at scan rates of 2 and 50 mV·s ﹣1 , respectively. Subjected to 500 cycles at a current density of 1.34 A·g ﹣1 , the symmetrical Mn-Co oxide capacitor showed specific capacitance of 179 F·g ﹣1 , still retaining ~85% of its initial capacitance. The obtained Mn-Co oxide material showed good capacitive performance, which was promising for supercapacitor applications.
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