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Interface engineering induced charge rearrangement boosting reversible oxygen electrocatalysis activity of heterogeneous FeCo-MnO@N-doped carbon nanobox
School of Materials Science and Engineering, Anhui University of Science and Technology, Anhui, Huainan, China.
School of Materials Science and Engineering, Anhui University of Science and Technology, Anhui, Huainan, China; Institute of Energy, Hefei Comprehensive National Science Center, Anhui, Hefei, China.
School of Materials Science and Engineering, Anhui University of Science and Technology, Anhui, Huainan, China.
School of Materials Science and Engineering, Anhui University of Science and Technology, Anhui, Huainan, China.
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2023 (Engelska)Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 650, s. 1350-1360Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The advancement of bifunctional oxygen catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is imperative yet challenging for the optimization of Zn-air batteries. In this study, we reported the successful incorporation of a novel Mott-Schottky catalytic site within a MnO-FeCo heterojunction into an N-doping carbon nanobox, taking into consideration the effects of the intrinsic electric field and hollow/porous support carriers for electrocatalyst design. As expected, the resulting heterogeneous catalyst exhibited an encouraging half-wave potential of 0.88 V and an impressive limiting-current density of 5.62 mA/cm2 for the ORR, as well as a minimal overpotential of 271 mV at 10 mA/cm2 for the OER, both in alkaline conditions. Furthermore, the Zn-air battery constructed with the heterojunction nanobox product displayed a decent potential gap of 0.621 V, an outstanding power density of 253 mW/cm2, a considerable specific capacity of 761 mAh/gZn, and exceptional stability, with up to 336 h of cycling charging and discharging operation. Consequently, this method of modulating the catalyst's surface charge distribution through an internal electric field at the interface and facilitating mass transport offers a novel avenue for the development of robust bifunctional oxygen catalysts.

Ort, förlag, år, upplaga, sidor
2023. Vol. 650, s. 1350-1360
Nyckelord [en]
Charge rearrangement, Mott-Schottky heterojunction, Oxygen evolution reaction, Oxygen reduction reaction, Zn-air battery
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Annan kemiteknik
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URN: urn:nbn:se:umu:diva-212416DOI: 10.1016/j.jcis.2023.07.101PubMedID: 37480650Scopus ID: 2-s2.0-85165215199OAI: oai:DiVA.org:umu-212416DiVA, id: diva2:1784632
Tillgänglig från: 2023-07-28 Skapad: 2023-07-28 Senast uppdaterad: 2023-07-28Bibliografiskt granskad

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Wågberg, Thomas

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