Lee, Hye-Jin Cho, Min Kyung Jo, Yoo Yeon Lee, Kug-Seung Kim, Hyung-Juhn Cho, EunAe Kim, Soo-Kil Henkensmeier, Dirk Lim, Tae-Hoon Jang, Jong Hyun 2024-01-20T14:34:00Z 2024-01-20T14:34:00Z 2021-09-05 2012-06 0141-3910 https://pubs.kist.re.kr/handle/201004/129207 Thermogravimetric analysis (TGA) has been proposed as a new post-analysis tool of membrane electrode assembly (MEA) for polymer electrolyte membrane fuel (PEMFC). Analysis of catalyst layer (CL) samples with various Nafion ionomer contents quantitatively confirmed that the Nafion ionomer decomposed first at around 320 degrees C and the support carbon at around 410 degrees C. For the degradation analysis of MEAs, the amount variation of components, including platinum (Pt) and attached gas diffusion layer (GDL), and the degree of Pt agglomeration could be evaluated from weight changes and DTG peak shifts (the platinum activation effect), respectively. For an MEA degraded by start-up/shut-down cycling, Pt agglomeration and significant GDL attachment, as well as invariant Pt amount and slight weight decrease of Nafion and supporting carbon, could be analyzed by a single TGA measurement. Similar degradation analysis was also possible for stack-operated MEAs. This TGA analysis technique is expected to be effectively utilized as a preliminary diagnosis tool in a routine characterization of degraded PEMFC MEAs. (C) 2012 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD FUEL-CELL PERFORMANCE MICROSTRUCTURE CHANGES THERMAL-STABILITY CATALYST LAYERS DUMMY LOAD PART II DURABILITY MEMBRANE HUMIDITY TEMPERATURE Application of TGA techniques to analyze the compositional and structural degradation of PEMFC MEAs Article 10.1016/j.polymdegradstab.2012.03.016 1 POLYMER DEGRADATION AND STABILITY, v.97, no.6, pp.1010 - 1016 POLYMER DEGRADATION AND STABILITY 97 6 1010 1016 scie scopus 000304641300024 2-s2.0-84860381664 Polymer Science Polymer Science Article FUEL-CELL PERFORMANCE MICROSTRUCTURE CHANGES THERMAL-STABILITY CATALYST LAYERS DUMMY LOAD PART II DURABILITY MEMBRANE HUMIDITY TEMPERATURE Polymer electrolyte membrane fuel cells (PEMFC) Membrane Electrode assembly (MEA) Durability Thermogravimetric analysis (TGA)