Cherkashinin, Gennady ; Schuch, Jona ; Kaiser, Bernhard ; Alff, Lambert ; Jaegermann, Wolfram (2020)
High Voltage Electrodes for Li-Ion Batteries and Efficient Water Electrolysis: An Oxymoron?
In: The Journal of Physical Chemistry Letters, 11 (10)
doi: 10.1021/acs.jpclett.0c00778
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We demonstrate that key parameters for efficient electrocatalytic oxidation of water are the energetics of the redox complexes associated with their ionization and electrochemical potentials coupled to the change of metal–oxygen band hybridization. We investigate the catalytic activity of the LiCoPO4–LiCo2P3O10 tailored compound, which is a 5 V cathode material for Li-ion batteries. The reason for the weak catalytic activity of the lithiated compound toward the oxygen evolution reaction is a large energy difference between the electronic states involved in the electrochemical reaction. A highly active catalyst is obtained by tuning the relative energetic position of the electronic levels involved in the charge transfer reaction, which in turn are governed by the lithium content. A significant lowering of the overpotential from >550 mV to ∼370 mV at 10 mA cm–2 is achieved via a decrease of the ionization potential and shifting the electrochemical potential near the electronic states of the molecule, thereby facilitating water oxidation.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Cherkashinin, Gennady ; Schuch, Jona ; Kaiser, Bernhard ; Alff, Lambert ; Jaegermann, Wolfram |
| Art des Eintrags: | Bibliographie |
| Titel: | High Voltage Electrodes for Li-Ion Batteries and Efficient Water Electrolysis: An Oxymoron? |
| Sprache: | Englisch |
| Publikationsjahr: | 17 April 2020 |
| Verlag: | American Chemical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Journal of Physical Chemistry Letters |
| Jahrgang/Volume einer Zeitschrift: | 11 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1021/acs.jpclett.0c00778 |
| URL / URN: | https://doi.org/10.1021/acs.jpclett.0c00778 |
| Kurzbeschreibung (Abstract): | We demonstrate that key parameters for efficient electrocatalytic oxidation of water are the energetics of the redox complexes associated with their ionization and electrochemical potentials coupled to the change of metal–oxygen band hybridization. We investigate the catalytic activity of the LiCoPO4–LiCo2P3O10 tailored compound, which is a 5 V cathode material for Li-ion batteries. The reason for the weak catalytic activity of the lithiated compound toward the oxygen evolution reaction is a large energy difference between the electronic states involved in the electrochemical reaction. A highly active catalyst is obtained by tuning the relative energetic position of the electronic levels involved in the charge transfer reaction, which in turn are governed by the lithium content. A significant lowering of the overpotential from >550 mV to ∼370 mV at 10 mA cm–2 is achieved via a decrease of the ionization potential and shifting the electrochemical potential near the electronic states of the molecule, thereby facilitating water oxidation. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Dünne Schichten 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung |
| Hinterlegungsdatum: | 20 Jul 2020 05:19 |
| Letzte Änderung: | 20 Nov 2020 08:52 |
| PPN: | |
| Projekte: | This work was supported by the German Science Foundation (DFG, CH 566/2-1)., G.C. thanks the Helmholtz Zentrum Berlin (BESSY II) for the allocation of synchrotron radiation beamtime at the SoLiAS endstation at the U56 II/PGM-1 beamline. |
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