电解液对全铅单液流电池电极性能的影响

doi:10.3866/PKU.WHXB201309161

Abstract

Abstract:

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.

Key words: All lead single flow battery, PbO₂/Pb²⁺, Pb²⁺/Pb, Graphite composite electrode, Fluoroboric acid solution

MSC2000:

O646

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 Phys. -Chim. Sin., 2013, 29(11): 2354-2360.

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

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