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O: Fachverband Oberflächenphysik

O 53: Focus Session: Electrocatalytic Energy Harvesting and Conversion

O 53.1: Topical Talk

Mittwoch, 9. März 2016, 10:30–11:00, S052

Insights into Oxygen Evolution Electrocatalysis on Perovskites — •Thomas J. Schmidt — Electrochemistry Laboratory, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland — Laboratory of Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland

Oxygen electrodes are playing a key role in electrochemical energy conversion devices such as fuel cells and water electrolyzers. In both acidic and alkaline environment, both the oxygen reduction and oxygen evolution reaction (ORR / OER), respectively, are limiting the overall energy/voltage efficiency due to its sluggish kinetics. [1, 2]

Whereas in acidic environment, mainly precious metals are used to catalyze the OER, the variety of possible catalysts in alkaline electrolyte is significantly increased and also many non-noble metal oxide based systems can be employed. Generally, the oxygen evolution mechanisms are only partly understood independent of the electrolyte environment and material used. In order to help to understand the underlying mechanisms for the reactions and to support the experimental results, very often computational methods are used, mainly using density functional theory (DFT) calculations.

In this talk, some of your recent findings on non-noble metal catalysts, mainly from the perovskite family will be presented employing both electrochemical as well as operando spectroscopic techniques.

[1] A. Rabis, P. Rodriguez, T.J. Schmidt, ACS Catal., 2012, 2 (5), 864-890 [2] E. Fabbri, A. Habereder, K. Waltar, R. Kötz, T.J. Schmidt, Cat. Sci. Tech., 2014, 4, 3800-3821