High Performance and Durable Anode with 10-Fold Reduction of Iridium Loading for Proton Exchange Membrane Water Electrolysis,Advanced Energy Materials

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High Performance and Durable Anode with 10-Fold Reduction of Iridium Loading for Proton Exchange Membrane Water Electrolysis
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-04-29 , DOI: 10.1002/aenm.202204169
Jorge Torrero ₁ , Tobias Morawietz _{1,

2} , Daniel García Sanchez ₁ , Dmitry Galyamin ₃ , Maria Retuerto ₃ , Vlad Martin‐Diaconescu ₄ , Sergio Rojas ₃ , José Antonio Alonso ₅ , Aldo Saul Gago ₁ , Kaspar Andreas Friedrich ₁

Affiliation

Proton exchange membrane water electrolysis (PEMWE) technology is especially advantageous for green H₂ production as a clean energy vector. During the water electrolysis process, the oxygen evolution reaction (OER) requires a large amount of iridium (2-3 mg_Ir cm⁻²) as catalyst. This material is scarce and expensive, representing a major bottleneck for large-scale deployment of electrolyzers. This work develops an anode with 10-fold reduction of Ir loading (0.2 mg_Ir cm⁻²) compared to what it is used in commercial PEMWE for more than 1000 h. An advanced catalyst based on an Ir mixed oxide (Sr₂CaIrO₆) is used for this purpose. Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS) analyses show that the unconventional structure of the reconstructed catalyst can contribute to the reduction of Ir in the catalyst layer. The reconfiguration of the ionomer in the catalyst layer is also observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM), results in almost the full coverage of the catalytic layer with ionomer. The results presented herein demonstrate that it is possible to achieve high performance and stability in PEMWE with low Ir loading in the anode without showing significant degradation.

中文翻译：

用于质子交换膜电解水的铱负载量减少 10 倍的高性能耐用阳极

质子交换膜水电解 (PEMWE) 技术作为清洁能源载体特别有利于绿色 H _2生产。在水电解过程中，析氧反应（OER）需要大量的铱（2-3 mg _Ir cm ^-2）作为催化剂。这种材料稀缺且昂贵，是电解槽大规模部署的主要瓶颈。这项工作开发了一种阳极，与商用 PEMWE 中使用的阳极相比，Ir 负载量减少了 10 倍（0.2 mg _Ir cm ^-2）超过 1000 小时。基于 Ir 混合氧化物 (Sr ₂ CaIrO ₆) 用于此目的。透射电子显微镜 (TEM)、X 射线光电子能谱 (XPS) 和 X 射线吸收光谱 (XAS) 分析表明，重构催化剂的非常规结构有助于催化剂层中 Ir 的还原。还通过扫描电子显微镜 (SEM) 和原子力显微镜 (AFM) 观察到催化剂层中离聚物的重新配置，导致离聚物几乎完全覆盖催化层。本文给出的结果表明，在 PEMWE 中实现高性能和稳定性是可能的，阳极中的 Ir 负载较低，而不会出现明显的退化。

更新日期：2023-04-29

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