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Organic-inorganic Hybrid Perovskite-based Light-assisted Li-oxygen Battery with Low Overpotential.

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Organic-inorganic hybrid perovskites have emerged in the last decade as promising semiconductors due to the excellent optoelectronic properties. This kind of perovskites exhibited respectable photocatalytic activities toward potential application in… Click to show full abstract

Organic-inorganic hybrid perovskites have emerged in the last decade as promising semiconductors due to the excellent optoelectronic properties. This kind of perovskites exhibited respectable photocatalytic activities toward potential application in battery, however, the instability issue still hindered their practical use. Herein, we assembled hybrid perovskite material, 4,4'-ethylenedipyridinium lead bromide onto the carbon materials to function as photoelectrode of the Li-oxygen battery. The strong cation-π interactions between the A-site cations enable this hybrid perovskite to endure the cycling process as well as the exposure to battery electrolyte and oxygen. Benefitting from the photo-generated carriers of the photoelectrode under illumination, the formation/decomposition of the discharge product was accelerated, thus leading to a reduced overpotential from 1.3 V to an optimized 0.5 V compared to the Li-oxygen battery without illumination. And the overpotential could be maintained lower than 0.9 V after cycling for 170 h. Furthermore, when exposed to the sunlight, the charging voltage was reduced for over 0.2 V. The intrinsic stability, strong light absorption of perovskites together with the optimized perovskite/carbon cathode interfaces contributed to the improved performance under different light sources without complex material design, which shed light on the exploration of organic-inorganic hybrid perovskite in Li-oxygen battery application.

Keywords: oxygen battery; inorganic hybrid; organic inorganic; battery; oxygen; hybrid perovskite

Journal Title: ChemSusChem
Year Published: 2022

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