Tailoring the d-band center by intermetallic charge-transfer manipulation in bimetal alloy nanoparticle confined in N-doped carbon nanobox for efficient rechargeable Zn-air battery
[Display omitted] •Fe-Ni alloy nanoparticle confined in N-doped carbon nanobox was developed.•The alloying of Ni into Fe could well manipulate the electronic structure.•This nanoreactor as an efficient ORR-OER electrocatalyst in rechargeable ZAB. In this effort, the electronic-structure modulation s...
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Veröffentlicht in: | Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-05, Vol.463, p.142411, Article 142411 |
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Format: | Artikel |
Sprache: | eng |
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•Fe-Ni alloy nanoparticle confined in N-doped carbon nanobox was developed.•The alloying of Ni into Fe could well manipulate the electronic structure.•This nanoreactor as an efficient ORR-OER electrocatalyst in rechargeable ZAB.
In this effort, the electronic-structure modulation strategy through nano-alloying was rationally designed to fabricate Fe-Ni alloy particles embedded in an N-doped carbon nanobox. The as-developed catalyst outperformed the commercialized noble-metal benchmarks with a decent half-wave potential of 0.891 V for ORR and a small overpotential of 325 mV at 10 mA/cm2 for OER both in 0.1 M KOH solution. Beyond that, a highly-efficient regenerative Zn-air battery was also successfully constructed, evidenced by a small potential gap of 0.664 V (between Ej=10 and E1/2), a high specific capacity of 763 mAh/g, a large peak power density of 270 mW/cm2, and robust stability. Ultraviolet photoelectron spectroscopy and theoretical simulation confirmed that the alloying of Ni into Fe could well manipulate the electronic structure, leading to favorable intermetallic charge-transfer and then downshifting the d-band center of Fe adsorption sites, all of which help to significantly lower the reaction barriers of the involved intermediates during the electrocatalytic ORR/OER processes. |
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ISSN: | 1385-8947 1873-3212 1873-3212 |
DOI: | 10.1016/j.cej.2023.142411 |