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Hydrophobic-aerophilic composite catalysts enable the fast-charging Zn-air battery to operate 1200 h at 50 mA cm−2
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0002-0728-9201
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Number of Authors: 72024 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 481, article id 148798Article in journal (Refereed) Published
Abstract [en]

High-efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are central to Zn-air batteries (ZABs). However, the bifunctional activity of catalysts is still unsatisfactory, which restricts the fast-charge performance of ZABs. In this work, we constructed a hydrophobic-aerophilic bifunctional catalyst, where CoFe nanoparticles (NPs) and single atoms (SAs) are separately loaded on zeolite imidazolate fame (ZIF)-derived carbon and hollow carbon tubes respectively (CoFe NP@SA). Thereinto, CoFe SAs are known to be highly active to ORR reaction. Moreover, the in-situ Raman illustrates that CoFe NPs are transformed to CoOOH and FeOOH by electrochemical reconstruction, which can boost the OER activity. Furthermore, the hydrophobic-aerophilic surface can repel water molecules to create abundant solid–liquid-gas three-phase reaction interfaces and expose active sites, which consequently promote the diffusion of reactive molecules/ions across the interface and the oxygen adsorption. Thus, the CoFe NP@SA catalyst exhibit an ultralow ORR/OER potential gap of 0.6 V. After assembled as zinc-air battery (ZAB), it demonstrates a low charge potential (2.09 V) under a high current density of 50 mA cm−2 with the 1200-hour durability. This strategy paves the way to realize the high-power-density and fast-charging ZABs.

Place, publisher, year, edition, pages
2024. Vol. 481, article id 148798
Keywords [en]
Hydrophobic-aerophilic surface, Bifunctional catalysts, Graphitic carbon nanotubes, Electrochemical reconstruction, Fast-charging Zn -air batteries
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-227336DOI: 10.1016/j.cej.2024.148798ISI: 001167042400001Scopus ID: 2-s2.0-85185494166OAI: oai:DiVA.org:su-227336DiVA, id: diva2:1844418
Available from: 2024-03-13 Created: 2024-03-13 Last updated: 2024-03-13Bibliographically approved

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Xia, Yu

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