Park, Hyanjoo Kim, Hoyoung Kim, Dong-Kwon Lee, Woo Jae Choi, Insoo Kim, Hyoung-Juhn Kim, Soo-Kil 2024-01-19T16:03:31Z 2024-01-19T16:03:31Z 2021-09-02 2020-11-20 0360-3199 https://pubs.kist.re.kr/handle/201004/117837 Phosphoric acid (PA)-doped polybenzimidazole (PBI) membranes used in high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) have high proton conductivity, and excellent mechanical and thermal stability. However, the deliquescence of PA leads to performance deterioration in humid atmosphere. The performance degradation upon exposure of the PA-doped membrane to humidity and the changes in the performance as a function of the PA loading in the electrodes are investigated. The performance of the HT-PEMFC employing the humidity-exposed membrane declines by 74.1% compared to that of the pristine membrane due to ineffective formation of the three-phase boundary. Loading a small amount of PA into the electrode induces drastic performance recovery with a decrease in the charge transfer resistance, especially at the anode. PA-dosing of both electrodes produces the best performance recovery, exceeding that of the pristine counterparts. This is a simple and effective method of recovering the performance of HT-PEMFCs after humidity-related deterioration. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD DOPED POLYBENZIMIDAZOLE COMPOSITE MEMBRANES H3PO4 WATER CONDUCTIVITY RESISTANCE TRANSPORT HUMIDITY METHANOL LEVEL Performance deterioration and recovery in high-temperature polymer electrolyte membrane fuel cells: Effects of deliquescence of phosphoric acid Article 10.1016/j.ijhydene.2020.03.039 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.45, no.57, pp.32844 - 32855 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 45 57 32844 32855 scie scopus 000588285000011 2-s2.0-85082530231 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article DOPED POLYBENZIMIDAZOLE COMPOSITE MEMBRANES H3PO4 WATER CONDUCTIVITY RESISTANCE TRANSPORT HUMIDITY METHANOL LEVEL High-temperature polymer electrolyte membrane fuel cell Phosphoric acid (H3PO4) Deliquescence Polybenzimidazole (PBI) membrane Humidity Performance recovery