硫碘循环中电化学Bunsen反应特性研究  

CHARACTERISTICS OF ELECTROCHEMICAL BUNSEN REACTION IN THE SULFUR-IODINE CYCLE

作　　者：应芝[1] 张彦威[1] 周俊虎[1] 刘建忠[1] 王智化[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《太阳能学报》2017年第1期106-111,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金面上项目(51276170)

摘　　要：为了探讨电化学Bunsen反应特性,通过自主搭建实验系统,研究Nafion 115膜在电池中的传输特性、两极酸溶液浓缩规律以及膜两侧的溶液交叉污染。结果表明;提高电流密度,膜的质子传递数和水渗透系数均减小,H_2SO_4和HI浓度增加;温度升高,质子传递数快速降低,而水渗透系数增加,即膜的传输特性变差,HI浓度明显降低,H_2SO_4浓度则增大;增加I_2/HI物质的量之比,水渗透系数和H_2SO_4浓度持续增大,而HI浓度降低。提高电流密度、温度或I_2/HI比时,均可促进杂质的迁移,即加重交叉污染。可见,适当控制电流密度、降低温度和I_2/HI物质的量之比,有利于实现最佳的电化学Bunsen反应。The electrochemical Bunsen reaction was carried out using Nation 115 membrane, and the transport properties of membrane, the concentration effect for H2SO4 and HI, and the cross-contamination between two electrolytes through membrane, were studied. Results showed that an increase in the current density reduced both the proton transport number （t＋） and water permeability coefficient （β） but amplified the concentration of H2SO4 and HI. As the temperature increases, value of t＋ rapidly decreases whereas β increasing, which indicates the degradation of membrane transport iproperties; meanwhile, HI concentration significantly decreased, but H2SO4 concentration increasing. Both the water permeation content and the concentration of H2SO4 amplified continuously with rising I2/HI molar ratio, while the HI concentration decreases. The permeation rate of impurities increases or the cross-contamination is aggravated as the current density, temperature, or I2/HI ratio increasing. In conclusion, a proper current density, a lower temperature and h/HI ratio may favor obtaining the optimum performance of the electrochemical Bunsen reaction.

关 键 词：氢能 热化学硫碘循环 电化学Bunsen反应 质子交换膜 

分 类 号：TK91[动力工程及工程热物理]