硫碘循环制氢中Bunsen反应新方法的研究进展

热化学硫碘(S-I)循环分解水是目前有较高效率且可以在相对较低温度条件下进行的制氢方法之一。 其中的Bunsen反应作为循环的核心步骤尤为重要。 为了更方便有效地分离Bunsen反应的生成物硫酸与氢碘酸,许多学者研究了Bunsen反应的新方法。 本文对非水溶剂中的Bunsen反应和电化学Bunsen反应两种新方法进行了综述。 讨论了非水溶剂中实现反应生成物分离的方法,对比了各种非水溶剂的性质及其优缺点。 目前,所发现的溶剂在分离生成物方面已达到要求,可用于Bunsen反应,但溶剂的回收再利用比较困难。 概述了电化学Bunsen反应的研究现状,对目前在电化学Bunsen反应中有突破进展的两个团队的工作进行了对比。 现今对该方法的探讨主要集中在反应基础特性方面,未来可以加强电化学Bunsen反应机理、反应电池结构设计与优化、以及新型S-I循环系统构造的研究。

Research Progress of New Methods for Carrying out Bunsen Reaction in Sulfur-Iodine Cycle for Hydrogen Production

The sulfur-iodine(S-I) thermochemical water-splitting cycle is one of the high-efficient methods for hydrogen production, which can be carried out at relatively low temperatures. The Bunsen reaction is particularly important as the core step of the cycle. In order to facilitate the effective separation of Bunsen reaction products, i.e., sulfuric acid and hydroiodic acid, new methods for carrying out Bunsen reaction have been studied by many scholars. In this paper, two new Bunsen reaction routes, including Bunsen reaction in non-aqueous solvents and electrochemical Bunsen reaction were reviewed. The separation of reaction products in non-aqueous solvents was discussed.The properties, advantages and disadvantages of various non-aqueous solvents were compared. It is found that the solvents adopted at present have met the requirements for the separation of Bunsen reaction products, and can be used for the Bunsen reaction, but the recovery and reuse of the solvents are difficult. The research status of electrochemical Bunsen reaction, and the comparison between the progress of two typical research teams were also summarized in this work. Most efforts have been made on the fundamental characteristics of the reaction, further attention can be paid to the electrochemical Bunsen reaction mechanism, cell structure design and optimization, and even construction of novel S-I cycle system.