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- Title
Photo‐energy Conversion and Storage in an Aprotic Li‐O<sub>2</sub> Battery.
- Authors
Zhu, Zhuo; Shi, Xiaomeng; Fan, Guilan; Li, Fujun; Chen, Jun
- Abstract
A photo‐involved Li‐O2 battery with carbon nitride (C3N4) is presented as a bifunctional photocatalyst to accelerate both oxygen reduction and evolution reactions. With illumination in a discharge process, photoelectrons generated in the conduction band (CB) of C3N4 are donated to O2 for O2−, which undergoes a second electron reduction to O22− and gives the final product of Li2O2; in a reverse process, holes left behind in the valence band (VB) of C3N4 plus an applied lower voltage than the equilibrium drive the Li2O2 oxidation. The discharge voltage is significantly increased to 3.22 V, surpassing the thermodynamic limit of 2.96 V, and the charge voltage is reduced to 3.38 V. This leads to a record‐high round‐trip efficiency of 95.3 % and energy density increase of 23.0 % compared to that in the dark.
- Subjects
OXYGEN evolution reactions; ENERGY density; VALENCE bands; CONDUCTION bands; ELECTRIC batteries; PHOTOELECTRONS
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 52, p19197
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201911228