Hydrogen Production by Steam Electrolysis in Solid Acid Electrolysis Cells,ChemSusChem

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Hydrogen Production by Steam Electrolysis in Solid Acid Electrolysis Cells
ChemSusChem ( IF 7.5 ) Pub Date : 2020-11-05 , DOI: 10.1002/cssc.202002281
Naoya Fujiwara ₁ , Hironori Nagase ₁ , Shohei Tada ₂ , Ryuji Kikuchi ₁

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Hydrogen production by steam electrolysis at intermediate temperatures has potential for both the high energy conversion efficiency and the flexible operability suitable for the utilization of renewable energy resources. Employment of proton‐conducting solid acid electrolytes at around 200 °C is considered promising but has rarely been investigated. Here, steam electrolysis was performed at 160–220 °C using a solid acid electrolysis cell (SAEC) composed of a CsH₂PO₄/SiP₂O₇ composite electrolyte and Pt/C electrodes. Hydrogen production was successfully demonstrated with Faraday efficiencies around 80 %. Key factors affecting the SAEC stability were investigated in detail for the first time. It was revealed that a certain part of the electrolyte migrated into the porous anode structure during the operation. The migrated electrolyte prevented the gas diffusion and flooded the Pt/C catalyst layer. It was also found that carbonaceous materials in the anode was oxidized, leading to the decrease in the number of electrochemically active sites. Based on the findings, Pt mesh was employed as an alternative anode. The SAEC with the Pt mesh anode showed superior stability, demonstrating the importance of the anode design. The present work provides a comprehensive view of the stability issues, which is essential for the development of durable and practical SAECs.

中文翻译：

在固体酸电解池中通过蒸汽电解制氢

在中间温度下通过蒸汽电解生产氢气具有潜在的高能量转换效率和适用于可再生能源利用的灵活可操作性。在200°C左右使用质子传导性固体酸电解质被认为是有希望的，但很少进行研究。在这里，使用由CsH ₂ PO ₄ / SiP ₂ O ₇组成的固体酸电解槽（SAEC）在160–220°C下进行蒸汽电解复合电解质和Pt / C电极。成功地证明了氢的生产，法拉第效率约为80％。首次详细研究了影响SAEC稳定性的关键因素。揭示了在操作过程中电解质的某些部分迁移到多孔阳极结构中。迁移的电解质阻止了气体扩散，并淹没了Pt / C催化剂层。还发现阳极中的碳质材料被氧化，导致电化学活性位点的数量减少。基于这些发现，铂网被用作替代阳极。具有Pt网格阳极的SAEC表现出优异的稳定性，证明了阳极设计的重要性。当前的工作提供了对稳定性问题的全面了解，

更新日期：2021-01-08

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