Capacitive Properties of Mesoporous Mn-Co Oxide Derived from a Mixed Oxalate

Yong Yan, Bingcai Wu, Cuihong Zheng, Daolai Fang

School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Ma’anshan, China.

DOI: 10.4236/msa.2012.36054                

Abstract

A mesoporous Mn-Co oxide for supercapacitors was derived from a mixed oxalate Mn_0.8Co_0.2C₂O₄·nH₂O, 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 m²·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.

Keywords

Supercapacitors; Manganese Oxide; Solid-State Reaction; Cyclic Voltammetry; Capacitive Performance

Conflicts of Interest

The authors declare no conflicts of interest.

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