Two Better Than One: Wnhanced Photo-Assisted Li-O2 Batteries with Bimetallic Fe-Uio-66 Metal-Organic Framework Photocathodes

时间:2024-03-28浏览:10

论文题目:Two Better Than One: Wnhanced Photo-Assisted Li-O2 Batteries with Bimetallic Fe-Uio-66 Metal-Organic Framework Photocathodes

论文作者:Yu-Ting Yang, Xu Hu, Guo-Fan Wang, Jia-Le Han, Qin-Ming Zhang, Wei-Wei Liu, Zhao-Jun Xie*, Zhen Zhou*

发表期刊:Adv. Funct. Mater.2024, 2315354

Abstract

Li‐O2 batteries,  known for their impressive theoretical specific energy, face significant  practical challenges, including slow kinetics, voltage hysteresis, and  reduced cycle life. In this study, a novel approach is introduced  utilizing a bimetallic metal‐organic framework known as Fe‐UiO‐66 as a  multifunctional photocatalyst to enhance the oxygen‐related reactions in  photo‐assisted Li‐O2 batteries. In contrast to  UiO‐66, Fe‐UiO‐66 exhibits an extended response to visible light, as  confirmed through UV–vis and photoluminescence spectra. Electron  paramagnetic resonance analysis provides further validation of the  pivotal role played by O2−  radicals in the electrochemical processes. Additionally, computations  are employed to elucidate the distinct function of Fe centers and the  underlying reaction mechanisms. Li‐O2 batteries  with Fe‐UiO‐66 cathodes have a reduced charge/discharge voltage  difference of 0.14 V under illumination and operate stably for 500  cycles. This work encourages MOF‐based photocathode development for Li‐O2 batteries.