Improving the Volumetric Capacity of Gallocyanine Flow Battery by Adding a Molecular Spectator.
ACS Appl Energy Mater
; 7(17): 7169-7175, 2024 Sep 09.
Article
em En
| MEDLINE
| ID: mdl-39268395
ABSTRACT
Gallocyanine (GAL) was recently introduced as a promising aqueous-soluble electroactive molecule for preparing two-electron storage alkaline flow battery (FB) negolytes. The development of a cost-effective GAL FB electrolyte is limited by the unexpectedly low solubility of GAL. In this work, the compound 7-amino-4-hydroxy-2-naphthalenesulfonic acid was introduced as a molecular spectator to modulate the solubility of GAL in KOH; this formulation allowed the preparation of a negolyte with a theoretical volumetric capacity of 32.00 Ah L-1. The cycling stability of an improved GAL electrolyte was demonstrated by operating a FB cell outside of the glovebox (bubbling N2 in the tanks). The cell exhibited a Coulombic efficiency close to 98% and began operating with 72.1% of its theoretical capacity (16.06 Ah L-1), retaining 88% of it after 110 cell cycles. This work demonstrates that significant improvement in electrolyte performance can be obtained with suitable additives and electrolyte engineering.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
ACS Appl Energy Mater
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Finlândia
País de publicação:
Estados Unidos