Citation: WEN Yue-Hua, GAO Chen, CHENG Jie, PAN Jun-Qing, CAO Gao-Ping, YANG Yu-Sheng. Effect of Electrolyte on the Performance of Electrodes for an All Lead Flow Battery[J]. Acta Physico-Chimica Sinica, ;2013, 29(11): 2354-2360. doi: 10.3866/PKU.WHXB201309161 shu

Effect of Electrolyte on the Performance of Electrodes for an All Lead Flow Battery

1.
1 Research Institute of Chemical Defence, Beijing 100191, P. R. China;
2 College of Science, Beijing University of Chemical Technology, Beijing 100029, P. R. China

Received Date: 26 June 2013
Available Online: 16 September 2013
Fund Project: 国家重点基础研究发展规划(973)(2010CB227201) (973)(2010CB227201)北京市先进化学蓄电技术和材料重点实验室(Z121109002812019)资助项目 (Z121109002812019)

The effect of Pb(Ⅱ) and H⁺ concentrations on the electrochemical behavior of a PbO₂ anode and a Pb cathode on a graphite composite was investigated. It is shown that the electrode process is under an electrochemical and diffusion mixed control. When a PbO₂ deposit is formed, a nucleation loop occurs. The nucleation overpotential of a Pb cathode is rather small. The difference between charge and discharge potentials of the Pb cathode is much lower than that of the PbO₂ anode. This indicates that the polarization in an all lead flow battery is attributed mainly to the PbO₂ anode. An increase in H⁺ concentration is beneficial for a reduction in the polarization; however, side reactions producing oxygen and hydrogen, and corrosion also increase. An increase of Pb(Ⅱ) concentration favors the suppression of oxygen evolution, however, the potential of the PbO₂ electrode is increased. This results in an increase in the difference between potentials of the charged and discharged states. When the Pb(Ⅱ) concentration is relatively low, PbO₂ deposits shed from the substrate during charge and discharge. As a result, the charge potential is further reduced. Appropriate concentrations of HBF4 and Pb(Ⅱ) were determined to be 2 mol ·L^-1 and greater than 0.9 mol·L^-1, respectively.
- All lead single flow battery,
- PbO₂/Pb²⁺,
- Pb²⁺/Pb,
- Graphite composite electrode,
- Fluoroboric acid solution
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沈阳化工大学材料科学与工程学院沈阳 110142