Combined Experimental and Computational Analyses on the Electronic Structure of Alluaudite-Type Sodium Iron Sulfate
| Autor: | Gosuke Oyama, Atsuo Yamada, Hisao Kiuchi, Yoshihisa Harada, Sai Cheong Chung |
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| Rok vydání: | 2016 |
| Předmět: |
X-ray absorption spectroscopy
Valence (chemistry) Absorption spectroscopy Inorganic chemistry Ionic bonding 02 engineering and technology Electronic structure 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Iron sulfate chemistry.chemical_compound General Energy chemistry Ab initio quantum chemistry methods Physical chemistry Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry C. 120:23323-23328 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.6b05569 |
| Popis: | Alluaudite-type sodium iron sulfate, Na2.56Fe1.72(SO4)3, has the highest redox potential in any Fe3+/Fe2+ environment; here, its electronic structure is investigated by combining X-ray absorption spectroscopy (XAS), semiempirical ligand field multiplet (LFM) simulations, and ab initio calculations. The LFM simulations for the Fe L2,3-edge XAS reveals the exceedingly ionic character of the Fe–O bond due to the strong inductive effect of the sulfate group; this is one of the main factors which enhance the electrode potential of Na2.56Fe1.72(SO4)3. Both experimental XAS measurements and ab initio calculations indicate electrochemical charging (desodiation) gives more hybridized iron 3d and oxygen 2p states. The degree of covalency between iron and oxygen changes reversibly along with the change of the iron valence state. |
| Databáze: | OpenAIRE |
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