Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 53: Solid-liquid interfaces: Reactions and electrochemisty III (joint session O/CPP)

CPP 53.4: Talk

Wednesday, March 14, 2018, 15:45–16:00, MA 144

Epitaxial oxides as model electrodes for electrolyzer and fuel cell reactions at room temperature — •Marcel Risch, Julius Scholz, Janis Geppert, Lennart Köhler, Garlef Wartner, and Christian Jooss — Georg-August-Universität Göttingen, Institut für Materialphysik,

Energy carriers based on sustainable hydrogen are highly desirable for storage of intermittent renewable energy. The performance of the required electrolyzer and fuel cell technology could be improved significantly by a fundamental understanding of the basic reaction steps of the oxygen electrodes, which present the current bottleneck for electrocatalysis at room temperature. The chemistry and correlation physics of perovskite oxides can be tuned by chemical substitution to derive property-activity relationships [1]. Epitaxial thin films with optimized composition are very active for both the evolution as well as reduction of oxygen [2]. Moreover, perovskite oxide films of conductive (La,Sr)MnO3 showed terraces with unit cell step height and the perovskite structure was preserved after electrolysis in alkaline solution [3]. These properties make perovskite oxides ideal model surfaces to elucidate the catalytic mechanisms of oxygen evolution and reduction at room temperature. It will be discussed how the combination of materials physics, electrochemistry and spectroscopy leads to the desired mechanistic insight on selected perovskite oxides with defined surfaces.

References: [1] Risch et al., Catalysts 7, 139 (2017); [2] Risch et al., J. Am. Chem. Soc. 136, 5229 (2014); [3] Scholz et al., J. Phys. Chem. C 120, 27746 (2016), Scholz et al., Catalysts 7, 139 (2017).