Using a Heme‐Based Nanozyme as Bifunctional Redox Mediator for Li−O2 Batteries,Batteries & Supercaps

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Using a Heme‐Based Nanozyme as Bifunctional Redox Mediator for Li−O2 Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-01-22 , DOI: 10.1002/batt.201900196
Xiaowei Mu ₁ , Yufeng Liu ₁ , Xueping Zhang ₁ , Hui Wei ₁ , Ping He ₁ , Haoshen Zhou _{1,

2}

Affiliation

The realization of practical aprotic Li−O₂ 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−O₂ 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−O₂ 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−O₂ batteries should pave a new way for the sustainable cross‐link between biomimetic enzymes and advanced energy storage.

中文翻译：

使用基于血红素的纳米酶作为Li-O2电池的双功能氧化还原介体

超氧化物相关的寄生反应和高过电势阻碍了实用的非质子型Li-O ₂电池的实现。在本文中，含有铁卟啉衍生物配体的基于血红素的纳米酶被用作新型电解质添加剂，以清除Li-O ₂系统中的超氧自由基。特别地，这种类型的纳米酶可以通过与超氧化物中间体配合而充当放电和充电的双功能催化剂，并充当超氧化物种和电子在阴极和产物之间的分子穿梭。结果，在纳米酶添加剂的存在下，Li-O ₂电池表现出增强的放电容量，降低的电荷极化和优异的循环稳定性。在Li-O中使用纳米酶的首次尝试_2个电池应该为仿生酶和高级能量存储之间的可持续交联铺平道路。

更新日期：2020-01-22

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