期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 42, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202100238
关键词
anion-exchange membranes; electrolyzers; fuel cells; metallopolymers; polyelectrolytes
资金
- Ministry of National Infrastructure, Energy and Water Resources of Israel [218-11-027]
- Nancy & Stephen Grand Technion Energy Program (GTEP)
This study systematically investigated the effect of ligand valency on nickel-based metallopolymers and found that metallopolymers with hexacoordinated nickel ions and two tridentate ligands demonstrate superior stability. Comparative analysis of the stability of different metallopolymers provides design parameters for novel metallopolymers in AEM applications.
Long-term stability is a key requirement for anion-exchange membranes (AEMs) for alkaline fuel cells and electrolyzers that is yet to be fulfilled. Different cationic chemistries are being exploited to reach such a goal, and metallopolymers present the unique advantage of chemical stability towards strong nucleophiles as compared to organic cations. Yet, the few metallopolymers tested in strongly alkaline conditions or even in fuel cells still degrade. Therefore, fundamental studies can be advantageous in directing future developments towards this goal. Here, a systematic study of the effect of ligand valency is presented, using nickel-based metallopolymers on polynorbornene backbones, functionalized with multidentate pyridine ligands. Metallopolymers using a single ligand type as well as all the possible mixtures are prepared and their relative stability towards aggressive alkaline conditions compared. Metallopolymer in which nickel ions are hexacoordinated with two tridentate ligands demonstrates superior stability. More importantly, by comparing all the metallopolymers' stability, the reason behind such relative stability provides design parameters for novel metallopolymer AEMs.
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