Interface engineering induced charge rearrangement boosting reversible oxygen electrocatalysis activity of heterogeneous FeCo-MnO@N-doped carbon nanoboxVisa övriga samt affilieringar
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
Nationell ämneskategori
Annan kemiteknik
Identifikatorer
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
2023-07-282023-07-282023-07-28Bibliografiskt granskad