Molecular Engineering of a 3D Self‐Supported Electrode for Oxygen Electrocatalysis in Neutral Media

Electrodes for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are required in energy conversion and storage technologies. An assembly strategy involves covalently grafting Co corrole 1 onto Fe3O4 nanoarrays grown on Ti mesh. The resulted electrode shows significantly improved ac...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2019-12, Vol.58 (52), p.18883-18887
Main Authors: Xie, Lisi, Li, Xialiang, Wang, Bin, Meng, Jia, Lei, Haitao, Zhang, Wei, Cao, Rui
Format: Article
Language:English
Subjects:
Atom economy
Catalysis
Chemical reduction
Durability
Electrocatalysis
Electrodes
Energy conversion
Energy storage
Iron oxides
metal–air batteries
molecular electrocatalysis
Oxygen
oxygen evolution
Oxygen evolution reactions
oxygen reduction
Oxygen reduction reactions
self-supported electrode
Titanium
Zinc
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Summary:Electrodes for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are required in energy conversion and storage technologies. An assembly strategy involves covalently grafting Co corrole 1 onto Fe3O4 nanoarrays grown on Ti mesh. The resulted electrode shows significantly improved activity and durability for OER and ORR in neutral media as compared to Fe3O4 alone and with directly adsorbed 1. It also displays higher atom efficiency (at least two magnitudes larger turnover frequency) than reported electrodes. Using this electrode in a neutral Zn‐air battery, a small charge–discharge voltage gap of 1.19 V, large peak power density of 90.4 mW cm−2, and high rechargeable stability for >100 h are achieved, opening a promising avenue of molecular electrocatalysis in a metal–air battery. This work shows a molecule‐engineered electrode for electrocatalysis and demonstrates their potential applications in energy conversion and storage. Molecule‐engineered 3D electrode: A self‐supported electrode of Fe3O4 nanoarrays grown on Ti mesh with grafted Co corroles shows improved activity, durability, and atom efficiency for oxygen electrolysis at neutral pH. A high‐performance neutral Zn‐air battery using this electrode is reported, the first molecule‐based metal‐air battery.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201911441