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Detailed kinetic study of the electrochemical Bunsen reaction in the sulfur-iodine cycle for hydrogen production

机译：硫碘循环中电化学本生反应用于制氢的详细动力学研究

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The electrochemical Bunsen reaction has been proposed as an innovative and promising method compared with the traditional Bunsen reaction for the sulfur-iodine cycle, and its kinetics were studied in this work. Polarization curves were measured using platinum electrode in. the different concentrations of SO2-H2O4-H2O and I-2-HI-H2O solutions at a temperature range of 303-353 K. Fundamental kinetic parameters, namely exchange current density, Tafel slope, asymmetry factor, were determined for anodic SO2 oxidation reaction and cathodic I-2 reduction reaction according to the Tafel plots. The activation energy and pre-exponential factor for the electrode reactions were also analyzed using Arrhenius relation. Results indicated that an increase in the SO2 concentration in the anolyte and the I-2 concentration in the catholyte reduced the activation energy, contributing to the easier anode and cathode reaction. Take high electrode reaction rate and easier electrode reactions into account, the initial SO2 concentration of 1.509 mol/L and the I-2/HI molar ratio of 0.5 could be optimal. (C) 2016 Elsevier Ltd. All rights reserved.
机译：与传统的本生反应相比，电化学-本生反应被提出作为一种创新的和有希望的方法，用于硫-碘循环，并且在这项工作中对其动力学进行了研究。使用铂电极在303-353 K的温度范围内，在不同浓度的SO2-H2O4-H2O和I-2-HI-H2O溶液中测量极化曲线。基本动力学参数，即交换电流密度，Tafel斜率，不对称性根据Tafel图确定了阳极SO 2的氧化反应和I-2阴极的还原反应。电极反应的活化能和指数前因子也使用Arrhenius关系进行了分析。结果表明，阳极电解液中SO2浓度的增加和阴极电解液中I-2浓度的降低会降低活化能，从而使阳极和阴极反应更加容易。考虑到较高的电极反应速率和较容易的电极反应，最佳的初始SO2浓度为1.509 mol / L，I-2 / HI摩尔比为0.5。 （C）2016 Elsevier Ltd.保留所有权利。

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