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Title: 3D Imaging of Nickel Oxidation States using Full Field X-ray Absorption Near Edge Structure Nanotomography

Abstract

Reduction-oxidation (redox) cycling of the nickel electrocatalyst phase in the solid oxide fuel cell (SOFC) anode can lead to performance degradation and cell failure. A greater understanding of nickel redox mechanisms at the microstructural level is vital to future SOFC development. Transmission x-ray microscopy (TXM) provides several key techniques for exploring oxidation states within SOFC electrode microstructure. Specifically, x-ray nanotomography and x-ray absorption near edge structure (XANES) spectroscopy have been applied to study samples of varying nickel (Ni) and nickel oxide (NiO) compositions. The imaged samples are treated as mock SOFC anodes containing distinct regions of the materials in question. XANES spectra presented for the individual materials provide a basis for the further processing and analysis of mixed samples. Images of composite samples obtained are segmented, and the distinct nickel and nickel oxide phases are uniquely identified using full field XANES spectroscopy. Applications to SOFC analysis are discussed.

Authors:
; ; ;  [1]
  1. Connecticut
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
NSFOTHERDOE - BASIC ENERGY SCIENCES
OSTI Identifier:
1028003
Resource Type:
Conference
Resource Relation:
Conference: 219th ECS Meeting ;May 1-6, 2011;Montreal, Canada
Country of Publication:
United States
Language:
ENGLISH
Subject:
30 DIRECT ENERGY CONVERSION; ABSORPTION; ANODES; ELECTROCATALYSTS; ELECTRODES; MICROSCOPY; MICROSTRUCTURE; NICKEL; NICKEL OXIDES; PERFORMANCE; PROCESSING; SOLID OXIDE FUEL CELLS; SPECTRA; SPECTROSCOPY; VALENCE

Citation Formats

Nelson, George, Harris, William, Izzo, John, Grew, Kyle N, and USARL). 3D Imaging of Nickel Oxidation States using Full Field X-ray Absorption Near Edge Structure Nanotomography. United States: N. p., 2012. Web. doi:10.1149/1.3570117.
Nelson, George, Harris, William, Izzo, John, Grew, Kyle N, & USARL). 3D Imaging of Nickel Oxidation States using Full Field X-ray Absorption Near Edge Structure Nanotomography. United States. https://doi.org/10.1149/1.3570117
Nelson, George, Harris, William, Izzo, John, Grew, Kyle N, and USARL). 2012. "3D Imaging of Nickel Oxidation States using Full Field X-ray Absorption Near Edge Structure Nanotomography". United States. https://doi.org/10.1149/1.3570117.
@article{osti_1028003,
title = {3D Imaging of Nickel Oxidation States using Full Field X-ray Absorption Near Edge Structure Nanotomography},
author = {Nelson, George and Harris, William and Izzo, John and Grew, Kyle N and USARL)},
abstractNote = {Reduction-oxidation (redox) cycling of the nickel electrocatalyst phase in the solid oxide fuel cell (SOFC) anode can lead to performance degradation and cell failure. A greater understanding of nickel redox mechanisms at the microstructural level is vital to future SOFC development. Transmission x-ray microscopy (TXM) provides several key techniques for exploring oxidation states within SOFC electrode microstructure. Specifically, x-ray nanotomography and x-ray absorption near edge structure (XANES) spectroscopy have been applied to study samples of varying nickel (Ni) and nickel oxide (NiO) compositions. The imaged samples are treated as mock SOFC anodes containing distinct regions of the materials in question. XANES spectra presented for the individual materials provide a basis for the further processing and analysis of mixed samples. Images of composite samples obtained are segmented, and the distinct nickel and nickel oxide phases are uniquely identified using full field XANES spectroscopy. Applications to SOFC analysis are discussed.},
doi = {10.1149/1.3570117},
url = {https://www.osti.gov/biblio/1028003}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 20 00:00:00 EST 2012},
month = {Fri Jan 20 00:00:00 EST 2012}
}

Conference:
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