Three-dimensional mapping of nickel oxidation states using full field x-ray absorption near edge structure nanotomography

The reduction-oxidation cycling of the nickel-based oxides in composite solid oxide fuel cells and battery electrodes is directly related to cell performance. A greater understanding of nickel redox mechanisms at the microstructural level can be achieved in part using transmission x-ray microscopy (...

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Veröffentlicht in:	Applied Physics Letters 2011-04, Vol.98 (17), p.173109-173109-3
Hauptverfasser:	Nelson, George J., Harris, William M., Izzo, John R., Grew, Kyle N., Chiu, Wilson K. S., Chu, Yong S., Yi, Jaemock, Andrews, Joy C., Liu, Yijin, Pianetta, Piero
Format:	Artikel
Sprache:	eng
Schlagworte:	catalysis (heterogeneous), energy storage (including batteries and capacitors), hydrogen and fuel cells, mechanical behavior, charge transport, membrane, carbon sequestration, materials and chemistry by design, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing)
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Beschreibung
Zusammenfassung:	The reduction-oxidation cycling of the nickel-based oxides in composite solid oxide fuel cells and battery electrodes is directly related to cell performance. A greater understanding of nickel redox mechanisms at the microstructural level can be achieved in part using transmission x-ray microscopy (TXM) to explore material oxidation states. X-ray nanotomography combined with x-ray absorption near edge structure (XANES) spectroscopy has been applied to study samples containing distinct regions of nickel and nickel oxide (NiO) compositions. Digitally processed images obtained using TXM demonstrate the three-dimensional chemical mapping and microstructural distribution capabilities of full-field XANES nanotomography.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.3574774