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Citation: FENG An, FAN Lijun, CAI Tao, LI Wenpo. Electrodeposition of Manganese Dioxide: The Nucleation Mechanism and Capacitance Performance[J]. Chinese Journal of Applied Chemistry, ;2015, 32(9): 1081-1087. doi: 10.11944/j.issn.1000-0518.2015.09.140446 shu

Electrodeposition of Manganese Dioxide: The Nucleation Mechanism and Capacitance Performance

1.
Chemistry and Chemical Engineering Department of Chongqing University, Chongqing 401331, China

Corresponding author: LI Wenpo,
Received Date: 25 December 2014
Available Online: 13 April 2015
Fund Project: 国家自然科学基金项目(21003163) (21003163)中央高校基本科研业务费科研专项(106112013025) (106112013025)重庆大学SRTP资金资助项目(CQUSRTP-2014378)资助 (CQUSRTP-2014378)

An ITO supported nanostructure manganese dioxide thin film electrode,fabricated by chronoamperometry was evaluated as a potential electrode for electrochemical capacitors.The nucleation mechanism was examined by fitting the experimental data (chronoamperometry) into the Scharifker/Hills nucleation models.SEM images of the electrodeposits show that the microstructure of manganese dioxide is affected by the deposition period.The capacity of the three kinds of manganese dioxide electrode materials formed by different nucleation mechanisms was investigated by cycle voltammetry,constant current chargedischarge method and AC impedance.The results show that the nucleation follows an instantaneous nucleation mechanism in the solution of 0.1 mol/L Mn²⁺ under a 0.365 V step potential,and mixed instantaneous and progressive nucleation mechanism in the solution of 0.01 mol/L Mn²⁺ under a 0.418 V step potential.The nucleation follows a progressive nucleation mechanism in the solution of 0.5 mmol/L Mn²⁺ under a 0.515 V step potential.It is obvious that the instantaneous nucleation is beneficial to preparing deposit sediment which has high specific surface area.Compare with other electrolytic deposit materials,this kind of material displays a better capacitance performance,implying that the capacitance performance can be influenced via different deposit approaches.
- manganese dioxide,
- electrodeposition,
- nucleation mechanism,
- supercapacitor
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