Abstract
Samples of spinel-type Ag x Co 3− x O 4 and perovskite-type Ag x La 1− x CoO 3 ( x ⩽ 0.3) prepared by thermal decomposition of the metal nitrates and subsequent solid state reaction of the oxides were deposited onto nickel substrates (layer thickness, about 40 μm) by vacuum plasma spraying (VPS). X-ray diffraction and photoelectron spectroscopy measurements show that during the deposition process decomposition of the powders takes place to some extent. However, the original single-phase spinel- and perovskite-type compounds can be reproduced by subsequent annealing at 700 °C. Whereas silver remains incorporated in the spinel lattice during VPS deposition, the solubility of silver in the perovskite lattice is fairly low. After anodic polarization of the electrodes in alkaline solution we found no evidence for alien phases in the electrocatalytic layers.
Published Version
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