High-Temperature Water Electrolysis Properties of Membrane Electrode Assemblies with Nafion and Crosslinked Sulfonated Polyphenylsulfone Membranes by Using a Decal Method

IF 3.3 4区工程技术 Q2 CHEMISTRY, PHYSICAL

Membranes Pub Date : 2024-08-08 DOI:10.3390/membranes14080173

Je-Deok Kim

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Abstract

To improve the stability of high-temperature water electrolysis, I prepared membrane electrode assemblies (MEAs) using a decal method and investigated their water electrolysis properties. Nafion 115 and crosslinked sulfonated polyphenylsulfone (CSPPSU) membranes were used. IrO2 was used as the oxygen evolution reaction (OER) catalyst, and Pt/C was used as the hydrogen evolution reaction (HER) catalyst. The conductivity of the CSPPSU membrane at 80 °C and 90% RH (relative humidity) is about four times lower than that of the Nafion 115 membrane. Single-cell water electrolysis was performed while measuring the current density and performing electrochemical impedance spectroscopy (EIS) at cell temperatures from 80 to 150 °C and the stability of the current density over time at 120 °C and 1.7 V. The current density of water electrolysis using Nafion 115 and CSPPSU membranes at 150 °C and 2 V was 1.2 A/cm2 for both. The current density of the water electrolysis using the CSPPSU membrane at 120 °C and 1.7 V was stable for 40 h. The decal method improved the contact between the CSPPSU membrane and the catalyst electrode, and a stable current density was obtained.

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采用贴花法研究含 Nafion 膜和交联磺化聚苯砜膜的膜电极组件的高温水电解特性

为了提高高温水电解的稳定性，我采用贴花法制备了膜电极组件（MEA），并研究了它们的水电解性能。使用了 Nafion 115 和交联磺化聚苯砜 (CSPPSU) 膜。以 IrO2 作为氧进化反应（OER）催化剂，以 Pt/C 作为氢进化反应（HER）催化剂。在 80 °C 和 90% RH（相对湿度）条件下，CSPPSU 膜的电导率比 Nafion 115 膜低约四倍。在 80 至 150 °C 的电池温度下进行了单电池水电解，同时测量了电流密度并进行了电化学阻抗谱分析（EIS），并在 120 °C 和 1.7 V 电压下测量了电流密度随时间变化的稳定性。在 150 °C 和 2 V 条件下，使用 Nafion 115 和 CSPPSU 膜电解水的电流密度均为 1.2 A/cm2 。贴花法改善了 CSPPSU 膜与催化剂电极之间的接触，获得了稳定的电流密度。

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来源期刊

Membranes Chemical Engineering-Filtration and Separation

CiteScore

6.10

自引率

16.70%

发文量

1071

审稿时长

11 weeks

期刊介绍： Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.