In the past few years of intensive research on Anion-Exchange Membrane (AEM) Fuel Cells (AEMFCs), amazing progress has been reported. Novel highly stable functional groups for AEMs1-4 and PGM-free catalysts5-7 were developed, new AEMFCs based on CRM-free catalysts were successfully demonstrated8, AEMFC lifetime of 5,000-15,000 hours was theoretically demonstrated for the first time9-10, and cell lifetime of 2,000 hours was experimentally proven11. Altogether, the research community has made very impressive progress in such a short time. However, due to the degradation of AEMs, the operation of AEMFCs has been limited only to low temperatures, mainly below 80 ℃. We have recently presented the first results of AEMFCs successfully operated at cell temperatures above 100 ℃12-16. At these high temperatures, we could achieve hydroxide conductivities close to 300 mS/cm17. The first results are very encouraging and represent a significant landmark for the technology, opening a wide door for a new field of study we call the High-Temperature AEMFCs (“HT-AEMFCs”). In this talk, I will present the latest achievements in the HT-AEMFCs. References Gjineci et al., Increasing the alkaline stability of N,N-diaryl-carbazolium salts using substituent electronic effects; ACS Appl. Mater. Interf. 12, 49617, 2020.Fan et al., Poly(bis-arylimidazoliums) possessing high hydroxide ion exchange capacity and high alkaline stability”; Nature Commun. 10(1), 2306, 2019.Gjineci et al., The reaction mechanism between tetraarylammonium salts and hydroxide; J. Org. Chem. 21, 3161-3168, 2020.Liu et al., Magnetic-field-oriented mixed-valence-stabilized ferrocenium anion-exchange membrane; Nature Energy 7, 329–339, 2022. Zion et al., Porphyrin aerogel catalysts for oxygen reduction reaction in anion-exchange membrane fuel cells; Functional Mater. 31(24), 2100963, 2021. Lilloja et al., Transition-metal and nitrogen-doped carbide-derived carbon/carbon nanotube composites; ACS Catalysis 11, 1920-1931, 2021. Kisand et al., Templated Nitrogen-, iron-, and cobalt-doped mesoporous nanocarbon derived from an alkylresorcinol mixture for AEMFC application; ACS Catalysis, 12, 14050-14061, Biemolt et al., An anion-exchange membrane fuel cell containing only abundant and affordable materials; Energy Technology 9, 2000909, 2021. Dekel et al., Predicting performance stability in anion exchange membrane fuel cells; Power Sources 420, 118-123, 2019. Yassin et al., Quantifying the critical effect of water diffusivity in anion exchange membranes for fuel cell applications; Membrane Sci. 608, 118206, 2020. Hassan et al., Achieving high-performance and 2000 h stability in AEMFCs; Energy Mater. 2001986, 2020. Douglin et al., A high-temperature anion-exchange membrane fuel cell; Power Sources Advances 5, 100023, 2020. Douglin et al., A High-Temperature AEMFC with a Critical Raw Material-free Nitrogen-doped Carbon Cathode; Chemical Engineering J. Adv. 8, 100153, 2021. Yassin et al., A surprising relation between operating temperature and stability of AEMFCs; Power Sources Adv. 11, 100066, 2021. Liu et al., Magnetic-field-oriented mixed-valence-stabilized ferrocenium anion-exchange membrane; Nature Energy 7, 329–339, 2022. Xue et al., High-temperature anion-exchange membrane fuel cells with balanced water management and remarkable stability; Joule, in press (https://doi.org/10.1016/j.joule.2024.02.011), 2024. Zhegur-Khais et al., Measuring the true hydroxide conductivity of anion exchange membranes; Membrane Sci. 612, 118461, 2020.
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