硫碘循环制氢中电化学Bunsen反应的动力学及流动、传质与反应特性研究

电化学Bunsen反应既可减少过量碘，又能实现酸分离，有利于简化硫碘循环制氢系统流程并降低系统能耗。深入开展电化学Bunsen反应动力学和电池内部流动、传质与反应过程特性的研究，可指导电池结构的设计优化，实现电化学Bunsen反应的规模化应用。本研究拟通过电化学Bunsen反应的基础实验探索超恒沸HI溶液生成特性，并提出低能耗生成超恒沸HI溶液的最优工况范围，为后续理论研究提供支撑数据；结合电化学工作站测量方法构建电化学Bunsen反应动力学模型并解析动力学机理；在此基础上，通过电池内部流动、传质与反应过程的数学机理模型建立和数值模拟，揭示流动、传质与反应特性，并阐明其对电池性能的影响。本研究力求结合实验探索、理论分析和计算模拟等手段在电化学Bunsen反应的关键科学问题上取得突破，为其在硫碘循环中的应用提供理论支撑，将有助于硫碘循环大规模高效低成本制备氢气这一终极目标的实现。

The electrochemical Bunsen reaction has advantages in reducing the excess iodine and realizing the separation of produced acids, and favoring the simplification of system flow and reduction of system energy consumption in the sulfur-iodine cycle for hydrogen production. Intensive study of the electrochemical Bunsen reaction kinetics and the characteristics of flow, mass transfer, and reaction inside the cell, is favorable for guiding the design and optimization of cell structure, and realizing the scale-up application of the electrochemical Bunsen reaction. In this work, the research methods and contents include: explore the generating performance of hyper-azeotropic HI solution for the electrochemical Bunsen reaction using basic tests, and then propose the optimum operating condition range for generating hyper-azeotropic HI solution with low-energy consumption, so as to provide support data for the following theoretical research; establish the electrochemical Bunsen reaction kinetic model and clarify the reaction kinetic mechanism based on the electrochemical workstation measuring method; on this basis, establish the mathematical mechanism model of flow, mass transfer, and reaction process inside the cell, and then illuminate the characteristics of flow, mass transfer, and reaction using the numerical simulation, and clarify their effects on cell performance. The project intends to make breakthrough in the key scientific issues of the electrochemical Bunsen reaction based on the experimental exploration, theoretical analysis, and computing simulation, so as to provide theoretical support for the application of the electrochemical Bunsen reaction in the sulfur-iodine cycle, and even contribute to achieving the ultimate goal of large-scale, high-efficient, and low-cost sulfur-iodine cycle for hydrogen production in the future.