Martinez-Septimo, Abissaid Gago, Aldo Saul Gonzalez-Huerta, Rosa de Guadalupe Malikah Najibah Henkensmeier, Dirk Goll, Miriam Hosseiny, Schwan 2024-10-16T06:00:22Z 2024-10-16T06:00:22Z 2024-10-15 2025-06 0360-3199 https://pubs.kist.re.kr/handle/201004/150805 For anion exchange membrane (AEM) electrolysers, degradation studies provide valuable insights into how individual components degrade. Often, this presents a formidable challenge as each component significantly contributes to overall degradation. Here, we propose a methodology to individually compare the degradation of key components in AEM electrolysers: hydrogen evolution reaction (HER) catalyst, oxygen evolution reaction (OER) catalyst, and the AEM itself. First, to measure the degradation of catalyst-coated substrates (CCS) commonly used in AEM electrolysers, the AEM was replaced with a diaphragm (Zirfon Agfa UTP 500) permeable to OH？ ions and stable in alkaline media. Subsequently, a cell with a stable catalytic layer (Nafion-coated Ni-felt substrates) was assembled to focus on membrane degradation with an AEM Sustainion X37-50 Grade 60. Chronopotentiometry and electrochemical impedance spectroscopy (EIS) revealed that the cell with the AEM experienced a threefold increase in ohmic resistance, attributed to the loss of functional groups. Additionally, an ion exchange capacity (IEC) analysis indicated that Sustainion lost approximately 20% of its ion exchange capacity. In contrast, the cell composed of CCS and Zirfon showed lower degradation. EIS data fitting demonstrated increased kinetic-related resistances while the ohmic resistance remained unchanged. This work presents a practical approach for comparing component degradation in AEM electrolysers. English Elsevier Dissociative electrochemical analysis of materials degradation of an anion exchange membrane electrolyser Article 10.1016/j.ijhydene.2024.10.027 1 International Journal of Hydrogen Energy, v.141, pp.996 - 1005 International Journal of Hydrogen Energy 141 996 1005 N scie scopus 001517313200025 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article ALKALINE WATER ELECTROLYSIS OXYGEN EVOLUTION ACTIVITY STAINLESS-STEEL POLYMER ELECTROLYTE PERFORMANCE STABILITY CATALYSTS HYDROGEN IRIDIUM COST