Research progress in SO2 depolarized electrolysis at INET

Luyao Xie, Ping Zhang, Ru Tian, Peng Xiao, Laijun Wang and Songzhe Chen

Renewable Energy, 2025, vol. 242, issue C

Abstract: INET (Institute of Nuclear and New Energy Technology, Tsinghua University) is a deep participant in nuclear hydrogen, paying great attention to SO2-depolarized electrolysis (SDE), which is the hydrogen producing step of hybrid sulfur cycle. In this paper, INET's recent advances in SDE research and the R&D plan are summarized. At current, INET focuses on the liquid-fed SDE system. Fundamental studies on SDE are carried out, including electrolysis mechanism, MEA/electrode fabrication, impedance composition analysis, cell design/optimization, and so on. With the application of porous flow field and three-dimensional anode, high SDE performance is obtained. At atmospheric pressure and cell voltage of 1.0 V, the current density of 800 mA/cm2 and 560 mA/cm2 were obtained when the anolyte H2SO4 concentration were set at 30 wt% and 50 wt%, respectively. Scale up of SDE stacks to both larger cell sizes and larger cell numbers are conducted. INET assembled multi-cell SDE stacks with active cell area of 246 cm2, achieving hydrogen producing rate of ∼500 NL/h. After optimization, a 4-cell stack with 1624 cm2 cell area has been built. INET's R&D plan of SDE research is presented. Future work incorporating optimized operating conditions and advanced cell structures is expected to further improve the SDE development.

Keywords: SO2-Depolarized electrolysis; Hybrid sulfur cycle; Nuclear hydrogen production; Membrane electrode assembly; Electrolyzer (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:242:y:2025:i:c:s0960148125000862

DOI: 10.1016/j.renene.2025.122424

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