Metal–Organic Framework with Dual Excitation Pathways as Efficient Bifunctional Catalyst for Photo-assisted Li–O2 Batteries

Yinglei Tao, Xiaoli Fan, Xingyu Yu, Ke Gong, Yujiao Xia, Hao Gong, Haixia Chen, Xianli Huang, Aidi Zhang, Tao Wang, Jianping He

科研成果: 期刊稿件文章同行评审

6 引用 (Scopus)

摘要

Li–O2 batteries (LOBs) have sparked significant interest due to their fascinating high theoretical energy density. However, the large overpotential for the formation and oxidation of Li2O2 during charge and discharge process seriously hinders the further development and application of LOBs. In this work, metal–organic frameworks (MOFs) with different metal clusters (Fe, Ti, Zr) are successfully synthesized, and they are employed as the photoelectrodes for the photo-assisted LOBs. The special dual excitation pathways of Fe-MOF under illumination and the superior separation efficiency of photocarriers, which significantly enhance the activation of O2/Li2O2, improving the catalytic activity of oxygen reduction reaction and oxygen evolution reaction. Moreover, compared to traditional inorganic semiconductor crystals, Fe-MOF exhibits large specific surface area and excellent O2 adsorption ability. Therefore, the LOB with Fe-MOF as the cathode exhibits large specific capacity, ultralow charge/discharge overpotential of 0.22 V at 0.05 mA cm−2 and excellent stability of 195 cycles under illumination. This study provides an environmentally friendly and highly efficient photocatalyst for LOBs, and a new strategy for designing photoelectrodes.

源语言英语
文章编号2403683
期刊Small
20
46
DOI
出版状态已出版 - 14 11月 2024
已对外发布

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