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AKE: Arbeitskreis Energie

AKE 2: Renewable Energy: Photovoltaics

AKE 2.3: Vortrag

Montag, 27. März 2017, 11:45–12:00, S Aula

Growth-control of the ordered double-perovskite stucture in (Pr_0.5Ba_0.5)CoO_3−δ thin films — •Gunkel Felix¹, Hausner Clemens², David N. Müller², Daniel Bick¹, Lei Jin³, Chunlin Jia³, Theo Schneller¹, Ilia Valov², and Dittmann Regina² — ¹Institute of Electronic Materials (IWE2), RWTH Aachen University — ²Peter Grünberg Institut, Forschungszentrum Jülich GmbH — ³Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Jülich

The complex oxide compound (Pr_0.5Ba_0.5)CoO_3−δ (PBCO) is considered an efficient catalytic oxide for oxygen evolution half-reaction (OER) taking place during water splitting operation. We discuss structural and electrical properties of epitaxial PBCO thin films serving a model systems for exploring the atomistic processes during OER. PBCO thin films are synthesized in a disordered and in an ordered double-perovskite crystal structure by controlling the growth temperature during pulsed laser deposition. The thin films are fabricated with defined surface morphologies and crystal orientation. During the growth process, the transition from disordered to ordered phase can be monitored directly by means of electron diffraction (RHEED). The epitaxial thin films show catalytic activity comparable to their porous counter parts fabricated by chemical routes, making them ideal model templates for systematic studies. The ability to control the ordered double-perovskite phase of PBCO bears the potential to force the formation of structural oxygen vacancies within the lattice with atomic precision and to tailor active sites for OER on the nanoscale.