Detailed kinetic study of the electrochemical Bunsen reaction in the sulfur-iodine cycle for hydrogen production
Detailed kinetic study of the electrochemical Bunsen reaction in the sulfur-iodine cycle for hydrogen production
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DOI：
10.1016/j.enconman.2016.02.046
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发表时间：
2016-05-01
影响因子：
10.4
通讯作者：
Cui, Guomin
中科院分区：
文献类型：
--
作者：
Ying, Zhi;Zheng, Xiaoyuan;Cui, Guomin
在硫碘循环中，电化学本生反应被认为是一种与传统本生反应相比具有创新性和应用前景的方法，并对其动力学进行了研究。用铂电极测量了极化曲线。根据Tafel图测定了不同浓度的SO2-H_2O_4-H_2O和I-2-HI-H_2O溶液在303-353K温度范围内的交换电流密度、塔菲尔斜率、不对称因子等基本动力学参数。用Arrhenius关系式分析了电极反应的活化能和指前因子。结果表明，随着阳极液中SO2浓度和阴极液中I-2浓度的增加，活化能降低，有利于阳极和阴极反应的进行。考虑到电极反应速度快，电极反应容易，SO2初始浓度为1.509摩尔/L，I-2/HI摩尔比为0.5时为最佳。(C)2016爱思唯尔有限公司。保留所有权利。
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.