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The Asymmetrical Fe-O-Se Bonds in Fe 2 O(SeO 3 ) 2 Boosting Bifunctional Oxygen Electrocatalytic Performance for Zinc-Air Battery.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Sep 03, pp. e202412025. Date of Electronic Publication: 2024 Sep 03. - Publication Year :
- 2024
- Publisher :
- Ahead of Print
-
Abstract
- Zinc-air batteries (ZABs) have the advantages of high energy density and rich zinc raw materials. It is a low-cost, green and sustainable energy storage device. At present, one of the key technologies that hinder the large-scale application of ZABs is the design and fabrication oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) bifunctional catalysts with excellent performance, especially the non-platinum-based catalysts. Here N-doped carbon-coated Fe-based selenium oxide catalyst Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> /Fe <subscript>3</subscript> C@NC with high performance has been fabricated by a one-step pyrolysis and then the electrochemical oxidization. The experimental results confirmed that the existence of Fe-O-Se bonds in Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> crystal phase of Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> /Fe <subscript>3</subscript> C@NC, and the Fe-O-Se bonds could obviously enhance ORR and OER catalytic performance of Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> /Fe <subscript>3</subscript> C@NC. Density functional theoretical calculations (DFT) confirmed that the Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> in Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> /Fe <subscript>3</subscript> C@NC had a higher d-band center of Fe atom and a lower p-orbital coupling degree with its own lattice O atom than Fe <subscript>2</subscript> O <subscript>3</subscript> , which leads to Fe site of Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> being more likely to adsorb external oxygen intermediates. The Fe-O-Se bonds in Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> results in the modification of coordination environment of Fe atoms and optimizes the adsorption energy of Fe site for oxygen intermediates. Compared with Fe <subscript>2</subscript> O <subscript>3</subscript> /Fe <subscript>3</subscript> C@NC, the Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> /Fe <subscript>3</subscript> C@NC showed the obvious enhancements of ORR/OER catalytic activities with a half-wave potential of 0.91 V for ORR in 0.1 M KOH electrolyte and a low overpotential of 345 mV for OER at 10 mA cm <superscript>-2</superscript> in a 1.0 M KOH electrolyte. The peak power density and specific capacity of Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> /Fe <subscript>3</subscript> C@NC-based ZABs are higher than those of Pt/C+RuO <subscript>2</subscript> -ZABs. The above results demonstrate that the asymmetrical Fe-O-Se bonds in Fe <subscript>2</subscript> O(SeO <subscript>3</subscript> ) <subscript>2</subscript> plays a key role in improving the bifunctional catalytic activities of ORR/OER for ZABs.<br /> (© 2024 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 39228013
- Full Text :
- https://doi.org/10.1002/anie.202412025