Molecular Engineering of a 3D Self‐Supported Electrode for Oxygen Electrocatalysis in Neutral Media. Issue 52 (7th November 2019)

• Record Type: Journal Article
• Authors: Xie, Lisi; Li, Xialiang; Wang, Bin; Meng, Jia; Lei, Haitao; Zhang, Wei; Cao, Rui
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 52(2019)
• Page Start: 18883
• Page End: 18887
• Publication Date: 2019-11-07
• Subjects: metal–air batteries -- molecular electrocatalysis -- oxygen evolution -- oxygen reduction -- self-supported electrode; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201911441
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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 Fe3 O4 nanoarrays grown on Ti mesh. The resulted electrode shows significantly improved activity and durability for OER and ORR in neutral media as compared to Fe3 O4 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. Abstract : Molecule‐engineered 3D electrode : A self‐supported electrode of Fe3 O4 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.