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Using a Heme‐Based Nanozyme as Bifunctional Redox Mediator for Li−O 2 Batteries
Author(s) -
Mu Xiaowei,
Liu Yufeng,
Zhang Xueping,
Wei Hui,
He Ping,
Zhou Haoshen
Publication year - 2020
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.201900196
Subject(s) - bifunctional , superoxide , chemistry , radical , electrolyte , redox , combinatorial chemistry , heme , catalysis , inorganic chemistry , electrode , organic chemistry , enzyme
The realization of practical aprotic Li−O 2 batteries is hindered by superoxide‐related parasitic reactions and high overpotentials. Herein, a heme‐based nanozyme containing iron‐porphyrin derivative ligands is used as a novel electrolyte additive to scavenge superoxide radicals in the Li−O 2 system. Specially, this type of nanozyme can act as a bifunctional catalyst for both discharge and charge by coordinating with superoxide intermediates, functioning as a molecular shuttle of superoxide species and electrons between cathodes and products. As a consequence, the Li−O 2 batteries exhibit boosted discharge capacity, reduced charge polarization and superior cycling stability in the presence of the nanozyme additive. This first attempt to using nanozyme in Li−O 2 batteries should pave a new way for the sustainable cross‐link between biomimetic enzymes and advanced energy storage.