Veeramani Vediyappan , Qiwen Lai , Takaya Fujisaki , John Andrews , Yoshitsugu Sone , Leonard Kwati , Hiroshige Matsumoto
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This configuration allows the gas/water separation to take place at the electrode so that pressurized water-free gases can be the output due to water being injected directly into the membrane as a source of electrolysis for a continuous supply of water it prevents membrane dehydration. Another important feature is also the cell can be operable in a reversible operation by combining with fuel cell operation. The membrane electrode assemblies (MEAs) were prepared using the hydrophobic-GDL, a Nafion membrane, and Pt-C/IrO<sub>2</sub> catalysts. Electrolysis experiments were performed at different temperatures with pressurized water (Δ<em>P</em> = 0.05–0.4 MPa based on atmospheric pressure) resulting output was pressurized (0.05–0.4 MPa) hydrogen and oxygen gases. The current densities at 1.6 V of electrolysis voltage were 117, 188, 262 mA cm<sup>−2</sup> at 25, 60, and 80 °C, respectively, and the hydrogen and oxygen gas evolution rates were consistent with theoretical values. It was found that increasing water pressure is beneficial to the electrode kinetics and there was an increase in water transport to the electrode surface as well as efficient gas separation and the production of pressurized gases.</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"416 ","pages":"Article 116678"},"PeriodicalIF":3.0000,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Pressurized water electrolysis using hydrophobic gas diffusion layer with a new electrolyzer cell structure\",\"authors\":\"Veeramani Vediyappan , Qiwen Lai , Takaya Fujisaki , John Andrews , Yoshitsugu Sone , Leonard Kwati , Hiroshige Matsumoto\",\"doi\":\"10.1016/j.ssi.2024.116678\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Direct production of pressurized hydrogen through polymer exchange membrane (PEM) water electrolysis without the usage of the external compressor is an industrially important approach to maximize energy efficiency. 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引用次数: 0
摘要
通过聚合物交换膜(PEM)水电解法直接生产加压氢气而无需使用外部压缩机,是工业上实现能源效率最大化的重要方法。传统水电解器面临的另一个挑战是无法将生成的气体(氢气和氧气)从水中分离出来。在本报告中,我们展示了一种新型水电解槽在疏水性气体扩散层(hydrophobic-GDL)的帮助下,在高进水压力下的运行情况。这种配置允许在电极上进行气体/水分离,从而可以输出加压无水气体,因为水被直接注入膜中,作为电解水的源头,可持续供应水,防止膜脱水。另一个重要特点是,该电池还可通过与燃料电池的运行相结合,实现可逆运行。使用疏水性-GDL、Nafion 膜和 Pt-C/IrO2 催化剂制备了膜电极组件(MEA)。电解实验在不同温度下与加压水(ΔP = 0.05-0.4 MPa,基于大气压力)一起进行,结果输出为加压(0.05-0.4 MPa)氢气和氧气。在 25、60 和 80 °C,1.6 V 电解电压下的电流密度分别为 117、188 和 262 mA cm-2,氢气和氧气的进化速率与理论值一致。研究发现,增加水压对电极动力学有利,水向电极表面的传输增加,气体分离效率提高,并产生加压气体。
Pressurized water electrolysis using hydrophobic gas diffusion layer with a new electrolyzer cell structure
Direct production of pressurized hydrogen through polymer exchange membrane (PEM) water electrolysis without the usage of the external compressor is an industrially important approach to maximize energy efficiency. An additional challenge in conventional water electrolyzers is the lack of separation of the generated gases, hydrogen and oxygen, from water. In this report, we demonstrate the operation of a new water electrolysis cell at high inlet water pressure with the assistance of a hydrophobic gas diffusion layer (hydrophobic-GDL). This configuration allows the gas/water separation to take place at the electrode so that pressurized water-free gases can be the output due to water being injected directly into the membrane as a source of electrolysis for a continuous supply of water it prevents membrane dehydration. Another important feature is also the cell can be operable in a reversible operation by combining with fuel cell operation. The membrane electrode assemblies (MEAs) were prepared using the hydrophobic-GDL, a Nafion membrane, and Pt-C/IrO2 catalysts. Electrolysis experiments were performed at different temperatures with pressurized water (ΔP = 0.05–0.4 MPa based on atmospheric pressure) resulting output was pressurized (0.05–0.4 MPa) hydrogen and oxygen gases. The current densities at 1.6 V of electrolysis voltage were 117, 188, 262 mA cm−2 at 25, 60, and 80 °C, respectively, and the hydrogen and oxygen gas evolution rates were consistent with theoretical values. It was found that increasing water pressure is beneficial to the electrode kinetics and there was an increase in water transport to the electrode surface as well as efficient gas separation and the production of pressurized gases.
期刊介绍:
This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on:
(i) physics and chemistry of defects in solids;
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