SurfaceScience21 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 74: Poster Session VI: Oxide and insulator surfaces: Structure, epitaxy and growth II
O 74.6: Poster
Mittwoch, 3. März 2021, 13:30–15:30, P
Phase diagrams of Co3O4 and Mn3O4 surfaces under different experimental conditions — •Maria Fernanda Juarez1, Hui Yin1, 2, and Axel Gross1 — 1Ulm University, Ulm, Germany — 2South China University of Technology, Guangzhou, P. R. China
In spite of the many advantageous features of the zinc-air batteries (ZABs), one of the basic problems for its uses is the slow kinetics of oxygen evolution and reduction reactions (OER and ORR) [1]. In recent years many effort has devoted to solve this problem by finding new electrocatalysts that promote both reactions or by changing the experimental conditions and thence the reaction mechanism[2].
Presently, Mn and Co oxides are among the most active electrochemical catalysts. By doping or by introducing oxygen vacancies, the electronic configuration of the metal ions can be modified, changing their interaction with the adsorbed species and leading to modifications in the catalytic activity.
It is the objective of this work to determine the proper surface structure of Mn3O4 and Co3O4 (111) surfaces under the experimental conditions of operating ZABs: oxidating or reducting environments and non-alkaline electrolytes. Using the concept of the computational hydrogen electrode [3], we will obtain the equilibrium structures as a function of potential and OH− concentration. As hydroxyls are strongly interacting with water, the presence of water will be taken into account.
[1] D. Yang et al. Elect. Energy Rev. (2019) 2:395.
[2] Sun et al. Science (2021) 371:46.
[3] Norskøv et al. J. Phys. Chem. B (2004) 108:17886.