Sofia B. Davey, Amanda P. Cameron, Kenneth G. Latham, Scott W. Donne
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引用次数: 2
Abstract
Herein we report on the charge storage behaviour of a non-porous planar glassy carbon electrode (GCE) in an aqueous electrolyte of 0.5 M Na2SO4 at temperatures in the range 25 °C to 50 °C. Preliminary cyclic voltammetry (CV) data indicate a decrease in electrode performance at increasing temperatures, and this was supported by detailed analysis of step potential electrochemical spectroscopy (SPECS) data. Kinetic analysis of the deconvoluted SPECS data using the Arrhenius equation has indicated that diffusional charge storage is not thermally activated, instead being possibly influenced by thermal scattering of electrolyte ions. Entropimetric analysis of the SPECS data has generated entropy and enthalpy data for charge storage in this system. These results are discussed in terms of charge storage at this interface.
本文报道了无孔平面玻碳电极(GCE)在0.5 M Na2SO4水溶液中在25℃至50℃温度范围内的电荷存储行为。初步的循环伏安(CV)数据表明，随着温度的升高，电极的性能会下降，这一点得到了阶跃电位电化学光谱(SPECS)数据的详细分析的支持。利用Arrhenius方程对反卷积SPECS数据进行动力学分析表明，扩散电荷存储不是热激活的，而是可能受到电解质离子热散射的影响。对SPECS数据进行熵分析，得到系统中电荷存储的熵和焓数据。从电荷存储的角度对这些结果进行了讨论。
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