Haller, Steffen ; Chaby Ribeiro, Catarina de ; Reinauer, Felix ; Yadav, Sandeep ; Ni, Lingmei ; Stark, Robert W. ; Schneider, Jörg J. ; Kramm, Ulrike I. (2024)
Influence of Hydrophilicity on the Performance of Bifunctional Cobalt-Based Catalysts in Zn–Air Batteries.
In: ACS Applied Energy Materials, 7 (11)
doi: 10.1021/acsaem.4c00153
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Zinc–air batteries are promising for portable applications: they use earth-abundant elements, work at low cost, are lightweight, and are also safe in application. For the air-breathing side (cathode), bifunctional catalysts for the oxygen reduction reaction (ORR, for discharging) and the oxygen evolution reaction (OER, for charging) are required and face their own challenges. Metal–nitrogen–carbon (MNC) catalysts and specific cobalt-based CoNCs show very good performance for both the ORR and the OER. However, their performance might be improved by optimizing the surface properties for a balanced interaction with water, as it is a reactant in one reaction but a product in the counterreaction. This work focused on the use of a CoNC catalyst in Zn–air batteries that is prepared by microwave pyrolysis. We systematically varied the surface properties of the catalyst with hydrogen peroxide treatments. Contact angle measurements and Raman spectroscopy were used to follow the impact on hydrophobicity and changes in the carbon morphology. By rotating disc electrode experiments, the optimal H₂O₂ treatment condition was identified. In a Zn–air battery cell, the performance changes in the initial polarization curve and the round-trip efficiency were evaluated for a period of in total 54 h. Electrode characterization of the catalysts prepared by mild and strong peroxide treatments indicates that the changes induced by cycling were very different but always resulted in the reconstruction of the catalyst. The results show that a treatment with hydrogen peroxide was effective to improve the bifunctional properties of the Co-based catalyst.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Haller, Steffen ; Chaby Ribeiro, Catarina de ; Reinauer, Felix ; Yadav, Sandeep ; Ni, Lingmei ; Stark, Robert W. ; Schneider, Jörg J. ; Kramm, Ulrike I. |
| Art des Eintrags: | Bibliographie |
| Titel: | Influence of Hydrophilicity on the Performance of Bifunctional Cobalt-Based Catalysts in Zn–Air Batteries |
| Sprache: | Englisch |
| Publikationsjahr: | 23 Mai 2024 |
| Ort: | Washington, DC |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ACS Applied Energy Materials |
| Jahrgang/Volume einer Zeitschrift: | 7 |
| (Heft-)Nummer: | 11 |
| DOI: | 10.1021/acsaem.4c00153 |
| Kurzbeschreibung (Abstract): | Zinc–air batteries are promising for portable applications: they use earth-abundant elements, work at low cost, are lightweight, and are also safe in application. For the air-breathing side (cathode), bifunctional catalysts for the oxygen reduction reaction (ORR, for discharging) and the oxygen evolution reaction (OER, for charging) are required and face their own challenges. Metal–nitrogen–carbon (MNC) catalysts and specific cobalt-based CoNCs show very good performance for both the ORR and the OER. However, their performance might be improved by optimizing the surface properties for a balanced interaction with water, as it is a reactant in one reaction but a product in the counterreaction. This work focused on the use of a CoNC catalyst in Zn–air batteries that is prepared by microwave pyrolysis. We systematically varied the surface properties of the catalyst with hydrogen peroxide treatments. Contact angle measurements and Raman spectroscopy were used to follow the impact on hydrophobicity and changes in the carbon morphology. By rotating disc electrode experiments, the optimal H₂O₂ treatment condition was identified. In a Zn–air battery cell, the performance changes in the initial polarization curve and the round-trip efficiency were evaluated for a period of in total 54 h. Electrode characterization of the catalysts prepared by mild and strong peroxide treatments indicates that the changes induced by cycling were very different but always resulted in the reconstruction of the catalyst. The results show that a treatment with hydrogen peroxide was effective to improve the bifunctional properties of the Co-based catalyst. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie > Fachgruppe Katalysatoren und Elektrokatalysatoren 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physics of Surfaces DFG-Sonderforschungsbereiche (inkl. Transregio) DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1487: Eisen, neu gedacht! |
| Hinterlegungsdatum: | 24 Sep 2024 13:15 |
| Letzte Änderung: | 24 Sep 2024 14:11 |
| PPN: | 521679451 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum