使用聚芴基电解质对阴离子交换膜水电解槽进行膜电极组件的启停循环耐久性分析,ACS Sustainable Chemistry & Engineering

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使用聚芴基电解质对阴离子交换膜水电解槽进行膜电极组件的启停循环耐久性分析
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-06-13 , DOI: 10.1021/acssuschemeng.2c07387
Sreekanth Narayanaru ₁ , Shoji Miyanishi ₁ , Hidenori Kuroki ₁ , Gopinathan M. Anilkumar _{1,

2} , Takeo Yamaguchi ₁

Affiliation

高度耐用的阴离子交换膜和离聚物对于开发具有成本效益的绿色制氢至关重要。阴离子交换膜和离聚物必须能够承受 OH 离子的化学侵蚀^，以及电解槽与间歇电源结合时不规则气泡形成引起的非线性机械应力。在此，我们检查了三甲基铵改性聚（芴-四氟亚苯基）（PFT-C ₁₀-TMA) 基膜和离聚物在动态操作下评估其与间歇电源耦合的能力。使用这些聚合物膜和离聚物制备的膜电极组件 (MEA) 的耐久性通过在 80 °C 的 1 M KOH 溶液中执行 1000 次启动-停止电压循环进行评估，同时改变所施加的电池电压。使用带有参比电极的电解槽同时评估MEA和电极的电化学性能，并使用NMR技术在耐久性测试之前和之后检查聚合物的化学结构。基于商用 Sustainion XB-7 离聚物和 X37-50 RT 阴离子交换膜的 MEA 显示，催化剂在启停循环过程中浸出，导致电池性能下降。另一方面，带有 PFT-C 的 MEA₁₀ -TMA 膜和离聚物在动态启停操作下表现出良好的化学和机械耐久性，鼓励开发可与间歇性可再生能源一起使用的电解槽。

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Start–Stop Cyclic Durability Analysis of Membrane–Electrode Assemblies Using Polyflourene-Based Electrolytes for an Anion-Exchange Membrane Water Electrolyzer

Highly durable anion-exchange membranes and ionomers are essential for developing cost-effective green hydrogen generation. The anion-exchange membrane and ionomer must withstand chemical attacks by OH^– ions as well as nonlinear mechanical stress caused by irregular bubble formation when the electrolyzer is coupled with intermittent power sources. Herein, we examined the durability of a trimethylammonium-modified poly(fluorene-alt-tetrafluorophenylene) (PFT-C₁₀-TMA)-based membrane and ionomer under dynamic operation to evaluate its competency to couple with intermittent power sources. The durability of membrane–electrode assembly (MEA) prepared using these polymer membrane and ionomer was evaluated by performing 1000 start–stop voltage cycles in 1 M KOH solution at 80 °C while varying the applied cell voltage. The electrochemical performances of the MEA and electrodes were simultaneously evaluated using an electrolyzer with reference electrodes, and the chemical structure of the polymer was examined before and after the durability test using NMR techniques. The MEA based on a commercial Sustainion XB-7 ionomer and X37-50 RT anion-exchange membranes showed the catalyst leaching during start–stop cycles, resulting in reduced cell performance. On the other hand, the MEAs with the PFT-C₁₀-TMA membrane and ionomer demonstrated promising high chemical and mechanical durability under dynamic start–stop operation, encouraging the development of electrolyzers that can function with intermittent renewable power sources.

更新日期：2023-06-13

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