Ligand Valency Effects on the Alkaline Stability of Metallopolymer Anion-Exchange Membranes.
Macromol Rapid Commun
; 42(16): e2100238, 2021 Aug.
Article
em En
| MEDLINE
| ID: mdl-34173300
ABSTRACT
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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Base de dados:
MEDLINE
Assunto principal:
Níquel
Idioma:
En
Revista:
Macromol Rapid Commun
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Israel