Perovskite thin films deposited by pulsed laser ablation as model systems for electrochemical applications
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Date
2007
Publication Type
Conference Paper
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yes
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Abstract
Thin films of a bifunctional electrocatalyst with the compositions La0.6Ca0.4CoO3−δ and La0.7Ca0.3CoO3−δ have been deposited by a variation of pulsed laser deposition, i.e. pulsed reactive crossed-beam laser ablation. These perovskite phases have been used as catalysts for oxygen reduction and evolution in re-chargeable Zn/air batteries. The utilization of a synchronized reactive gas pulse with N2O or O2 allows the preparation of perovskite films with almost ideal oxygen content without additional annealing steps and to control the oxygen content of the films. The films with higher oxygen content reveal a lower resistivity. These compositions have been selected to study the influence of the texture on the electrocatalytical activity for oxygen reduction and evolution of the films. Amorphous films, or films with mixed or single orientation can be obtained by varying the target–substrate distance and substrate temperature without changing the composition of the films. A clear influence of the crystallinity on the catalytic activity, i.e. smaller overpotential for the two oxygen reactions, is observed. The amorphous films reveal the largest overpotential, followed by the polycrystalline films with one or more orientations, and the single crystalline films with (100) orientation.
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published
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Journal / series
Volume
35 (2-4)
Pages / Article No.
221 - 231
Publisher
Pergamon
Event
International Conference on Perovskites at EMPA 2005
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Subject
PLD; PRCLA; Zn/air batteries; Electrocatalyst
Organisational unit
03421 - Wokaun, Alexander (emeritus)
08608 - Suter, Martin (Tit.-Prof.)
02513 - Laboratorium für Anorganische Chemie / Laboratory of Inorganic Chemistry