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Journal of Electrochemistry ›› 2015, Vol. 21 ›› Issue (4): 362-367.doi: 10.13208/j.electrochem.150126

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Reaction Mechanisms Study of Pb Electrodes in Sulfuric Acid and Sodium Sulfate Solutions by EQCM

ZOU Xian-ping1, KANG Zong-xuan1, HUANG Yu-lan1, SHU Dong1,2,3*, ZHONG Ya-yun1, HAO Jun-nan1, LIAO Yu-qing1   

  1. 1. School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; 2. Guangzhou Laboratory of Materials for Energy Conversion and Storage, Guangzhou 510006, China; 3. Engineering Research Center of Electrochemical Materials and Technology on Energy Storage, Ministry of Education, Guangzhou 510006, China
  • Received:2015-01-26 Revised:2015-04-09 Online:2015-08-28 Published:2015-09-15
  • Contact: SHU Dong E-mail:dshu@scnu.edu.cn

Abstract: Surface reaction processes of Pb electrodes were investigated in H2SO4 and Na2SO4 solutions by LSV, CV and EQCM. The results in the voltammogram and the mass change curve of the Pb electrode indicated that the oxide products of lead included PbSO4 and PbO·PbSO4 in sulfuric acid solution with a positive-going potential scan from -1.0 V to -0.4 V and then PbO·PbSO4 transformed into PbSO4. However, the oxide product of lead was only PbSO4 in sodium sulfate solution. The experimental results revealed that the acid solution is necessary for the formation of PbO·PbSO4 and the negative discharge mechanism of lead-acid batteries was suggested. This study had also provided a new research method for the negative plates of lead-acid battery.

Key words: lead-acid battery, electrochemical quartz crystal microbalances, cyclic voltammetry, Pb electrode

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