Abstract
The sulfur-iodine (S–I or I–S) thermochemical cycle is viewed as a leading method for hydrogen production due to its environmental sustainability, cost-efficiency, and high efficiency. This study critically reviews the advancements in the S–I cycle research made over the last two decades, primarily focusing on basic research aspects such as two-phase separation and side reactions in the Bunsen reaction, along with purification and decomposition processes of H2SO4 and HI. Furthermore, it offers an overview of the unique implementations and simulation results of the S–I cycle put forth by various global institutions. This paper also critically evaluates the feasibility of hydrogen production using the S–I cycle, considering technological, efficiency, economic, environmental, and safety aspects. Although the S–I cycle technology of hydrogen production has seen considerable progress over the years, to fast-track its industrialization, ongoing technical issues such as material compatibility and system matching ought to be addressed strategically.
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