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首页> 外文期刊>Electrochimica Acta >Electrochemical impedance spectroscopy study of the oxygen evolution reaction on a gas-evolving anode composed of lead dioxide microfibers
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Electrochemical impedance spectroscopy study of the oxygen evolution reaction on a gas-evolving anode composed of lead dioxide microfibers

机译：电化学阻抗光谱法研究由二氧化铅微纤维构成的气体逸出阳极上的氧气逸出反应

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摘要

The oxygen evolution reaction (OER) during the electrolysis of electrolyte-free water on a gas-evolving anode composed of lead dioxide microfibers (MF-β-PbO_2) was studied in a solid polymer electrolyte cell using the electrochemical impedance spectroscopy (EIS) technique. EIS spectra were recorded as a function of the overpotential for the OER. Impedance spectra characterized by two time constants distributed in the low and high frequency domains indicated that both the charge transfer and adsorption of reaction intermediates affect the electrode kinetics. In addition, it was verified that morphological aspects do not comprise the main cause for the time constant observed in the high frequency domain. In trying to interpret the EIS findings, a transfer function was derived for the electrode mechanism of Pavlov and Monahov in order to permit the evaluation of the adsorption pseudocapacitance, the double-layer capacitance and the charge transfer and adsorption resistances. It was verified that the adsorption pseudocapacitance is potential-dependent while the double-layer capacitance is almost potential-independent. It was also verified that the adsorption resistance decreases exponentially upon increasing the overpotential, exhibiting Tafel-like behavior. The apparent charge transfer coefficient, the exchange current density and the kinetic rate constant were evaluated from the impedance data.
机译：使用电化学阻抗谱（EIS）技术研究了在固体聚合物电解质电池中由二氧化铅微纤维（MF-β-PbO_2）构成的气体逸出阳极上电解无电解质水时的氧气释放反应（OER） 。记录的EIS光谱是OER超电势的函数。以在低频和高频域中分布的两个时间常数为特征的阻抗谱表明，电荷转移和反应中间体的吸附都会影响电极动力学。另外，已经证实形态学方面不构成在高频域中观察到的时间常数的主要原因。为了解释EIS结果，推导了Pavlov和Monahov电极机制的传递函数，以便评估吸附假电容，双层电容以及电荷转移和吸附电阻。证实了吸附假电容与电势有关，而双层电容几乎与电势无关。还证实了当增加过电势时，吸附阻力呈指数下降，表现出类似Tafel的行为。从阻抗数据评估表观电荷转移系数，交换电流密度和动力学速率常数。

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