Please use this identifier to cite or link to this item: https://doi.org/10.1002/aenm.202103622
Title: Redox-Mediated Two-Electron Oxygen Reduction Reaction with Ultrafast Kinetics for Zn-Air Flow Battery
Authors: Huang, Shiqiang
Zhang, Hang
Zhuang, Jiahao
Zhou, Mingyue
Gao, Mengqi
Zhang, Feifei 
Wang, Qing 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Materials Science
Physics
homogeneous catalysis
oxygen reduction reaction
peroxide
ultrafast kinetics
Zn-air batteries
CHALLENGES
ELECTRODES
CATALYSTS
CARBON
Issue Date: 21-Jan-2022
Publisher: WILEY-V C H VERLAG GMBH
Citation: Huang, Shiqiang, Zhang, Hang, Zhuang, Jiahao, Zhou, Mingyue, Gao, Mengqi, Zhang, Feifei, Wang, Qing (2022-01-21). Redox-Mediated Two-Electron Oxygen Reduction Reaction with Ultrafast Kinetics for Zn-Air Flow Battery. ADVANCED ENERGY MATERIALS 12 (10). ScholarBank@NUS Repository. https://doi.org/10.1002/aenm.202103622
Abstract: Rechargeable Zn–air batteries (ZABs) as high-energy density and cost-effective power sources for next generation energy storage have attracted considerable attention. However, the sluggish oxygen electrochemistry leads to high polarization of the air electrode during charge/discharge and consequently a low round-trip energy efficiency of the cell. Here it is shown that the two-electron oxygen redox chemistry enabled by a redox mediator, anthraquinone-2,7-disulfonic acid disodium salt (AQDS), can effectively boost the performance of ZABs. The kinetics and underlying mechanism of the AQDS-mediated oxygen reduction reaction at different pH are scrutinized both computationally and experimentally to delineate the reaction pathways and rate-limiting step. An ultrafast catalytic rate constant of 2.53 × 106 s–1 is achieved at a pH of 13.13 and based on a flow cell configuration, the AQDS-mediated Zn–air flow battery demonstrates considerably enhanced energy efficiency of 85% at 10 mA cm−2.
Source Title: ADVANCED ENERGY MATERIALS
URI: https://scholarbank.nus.edu.sg/handle/10635/225096
ISSN: 1614-6832
1614-6840
DOI: 10.1002/aenm.202103622
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