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

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

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.

Original languageEnglish
Article number2403683
JournalSmall
Volume20
Issue number46
DOIs
StatePublished - 14 Nov 2024
Externally publishedYes

Keywords

  • MOFs
  • O adsorption ability
  • different metal clusters
  • dual excitation pathways
  • photo-assisted Li–O batteries

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