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Engineering built-in electric fields in oxygen-deficient MnO-CeO2@Cs catalysts: enhanced performance and kinetics for the oxygen reduction reaction in aqueous/flexible zinc–air batteries.
- Source :
- Green Chemistry; 2/21/2024, Vol. 26 Issue 4, p2011-2020, 10p
- Publication Year :
- 2024
-
Abstract
- Deliberate engineering of built-in electric fields (BEFs) can facilitate electron transfer and promote asymmetrical charge distribution, thereby regulating the adsorption/desorption of reaction intermediates. Herein, an oxygen-deficiency-rich MnO-CeO<subscript>2</subscript> is synthetized supported on a carbon sphere (MnO-CeO<subscript>2</subscript>@Cs), adeptly crafted with a prominent work function difference (ΔΦ) and robust BEF, targeting the electrocatalytic oxygen reduction reaction (ORR). Empirical and theoretical results substantiate that the BEF triggers interfacial charge redistribution, fine-tuning the adsorption energy of oxygen intermediates and hastening reaction kinetics. Consequently, the MnO-CeO<subscript>2</subscript>@Cs showcases commendable performance (E<subscript>1/2</subscript> = 0.80 V and j<subscript>L</subscript> = 5.5 mA cm<superscript>−2</superscript>), outshining its single-component counterparts. Impressively, the MnO-CeO<subscript>2</subscript>@Cs-based zinc–air batteries (ZABs) boast an exemplary power density of 202.7 mW cm<superscript>−2</superscript> and enduring stability of 297 h. Additionally, the solid-state ZAB commands a peak power density of 67.4 mW cm<superscript>−2</superscript>, underscoring its potential in flexible ZAB applications. This work delineates a strategic avenue to harness interfacial charge redistribution, aiming to enhance the catalytic performance and longevity of energy conversion/storage apparatuses. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639262
- Volume :
- 26
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Green Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 175524921
- Full Text :
- https://doi.org/10.1039/d3gc04537d