Catecholic polymer binder with strong underwater adhesion and electrolyte wettability for seawater battery cathodes
발표자
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초록
내용
Conventional hydrophobic binders [e.g., poly(vinylidene fluoride) (PvdF), Nafion] limits the seawater batteries’ ability due to poor wettability toward seawater and adhesion property. The hydrophilic adhesive polymer binder is developed using three moieties; (i) dopamine methacrylamide (DMA), (ii) Poly(ethylene glycol) (PEG), and (iii) Poly(ethylene glycol) diacrylate (PEGDA). The synthesized polymer enhanced the stability of Pt/C and carbon felt surfaces via strong adhesion and good water wettability (confirmed by surface forces apparatus and water contact angle measurement, respectively). Moreover, the seawater battery with the synthesized polymer binder showed higher power and cycle stability compared to that of PvdF binder. The cross-section of carbon felt was imaged with transmission electron microscopy (TEM), which directly showed that the synthesized polymer binder prevents Pt/C from detachment and protection against carbon corrosion during the charge-discharge cycle.