Research on Hydrogen Production by Electrochemical Decomposition of HI x Solution

Yuhang An, Xiaofei Li, Jingxin Zeng, Xue Sun, Yuanyuan Duan and Qiang Song ()
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Yuhang An: Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Xiaofei Li: Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Jingxin Zeng: Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Xue Sun: Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Yuanyuan Duan: Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Qiang Song: Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China

Energies, 2025, vol. 18, issue 18, 1-13

Abstract: The electrochemical decomposition of HI x solution presents a promising alternative to overcome the challenges associated with HI thermal decomposition in the sulfur–iodine (S-I) cycle. In this study, constant current electrolysis and LSV tests were carried out for HI x solution using an H-type electrolyzer at different current densities and anode solution compositions. The results showed that during the process of HI electrolysis, the dominant factor of voltage variation gradually changed from electrochemical polarization to ohmic polarization as the current density increased. When the I 2 concentration in the HI solution approached saturation, a voltage step occurred in the constant current electrolysis, reaching a maximum amplitude of 127.69%. The analysis indicated that the voltage step was related to the I 2 deposition on the electrode and PEM, which led to the simultaneous increase in activation polarization and ohmic polarization overpotential. The increase in I 2 concentration decreased the limiting diffusion current density; I 2 supersaturation led to the formation of an insoluble iodine film on the electrode surface, ultimately terminating the electrochemical reaction. This study provides guidance for the development of HI x solution electrolysis technology for hydrogen production.

Keywords: S-I cycle; hydrogen production; HI x solution electrolysis; I 2 deposition (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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