Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 28, Issue 70, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202202064
Keywords
high-temperature polymer exchange membranes; fuel cells; phosphoric-acid loss; phosphoric-acid retention; proton conductivity
Categories
Funding
- National Natural Science Foundation of China [21835005, 52G15023]
- Innovation Fund Project of Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences [SCJC-HN-2022-16]
- Science and Technology Major Projects of Shanxi Province of China [20181102019]
- Hundred Talents Program of the Shanxi Province
- SKLCC [:2020BWZ001]
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Efforts have been made to mitigate the leaching of phosphoric acid (PA) in high temperature proton exchange membrane fuel cells (HT-PEMFC). Strategies such as introducing phosphonic acid by covalent bond, using ion-pairs interaction and siphoning effect, and blending with inorganic nanoparticles have been proposed. Among these strategies, the siphoning effect is the most efficient method to retain PA and enable flexible operation within a wide temperature range.
Great efforts have been conducted to develop high temperature proton exchange membrane fuel cell (HT-PEMFC) due to its features of enhanced electrocatalyst reactivity, simplified hydrothermal management system and high CO tolerance of catalysts, and remarkable progress has been achieved. However, the easy leaching of phosphoric acid (PA) from the membranes during operation limits its commercial scale-up in complicated environments. This concept here mainly focuses on the recent developments for mitigation of PA loss in PEMs. The probable mechanisms of PA loss are proposed. The approaches to improve PA retention for example via introduction of phosphonic acid by covalent bond, using ion-pairs interaction and siphoning effect, and blending with inorganic nanoparticles are described in detail. Among these strategies, the siphoning effect from the intrinsic microporous PEMs is the most efficient and enables the cell to operate flexibly within a broad temperature range. Therefore, this concept may provide new ideas for the scientists to retain PA, to improve the cell performance and expand the potential applications of PA doped PEMs at elevated humidity and wide temperature range.
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