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Citation: YANG Yu-Juan, SANG Lin, HUANG Cheng-De. Liquid Phase Synthesis and Capacitance Properties of Layered Nano MnO₂[J]. Chinese Journal of Applied Chemistry, ;2008, 25(4): 473-476. shu

Liquid Phase Synthesis and Capacitance Properties of Layered Nano MnO₂

1.
School of Chemical Engineering, Tianjin University, Tianjin 300072

Corresponding author: HUANG Cheng-De,
Received Date: 3 April 2007
Available Online: 3 July 2007

Layered nano δ-MnO₂ was synthesized by reaction of KMnO₄ and MnSO₄ in liquid phase at different molar ratios.The materials were amorphous hydrated manganese dioxide (K_xMnO₂·nH₂O) with small particle size and large specific surface area.Cyclic voltammetry (CV) and chronopotentiometry studies indicated that the MnO₂ material obtained at a molar ratio of 4:1 exhibited excellent capacitive behavior in 0.5 mol/L Na₂SO₄ aqueous electrolyte between -0.2 and +1.0 V (vs.SCE),with its specific capacitance of 290.03 F/g and 195.49 F/g at a discharge current density of 94 mA/g and 1 880 mA/g.The cycling behavior was studied by chronopotentiometry technique.At a current density of 375 mA/g,the first cycle showed the highest discharge specific capacitance of 227.84 F/g,and after 100 cycles it still was 200.12 F/g,about 88% of its initial capacitance.
- liquid phase synthesis,
- supercapacitor,
- δ-MnO₂,
- capacitance property
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Liquid Phase Synthesis and Capacitance Properties of Layered Nano MnO₂