Full Field Imaging of Nickel Oxidation States in Solid Oxide Fuel Cell Anode Materials by Xanes Nanotomography

2011 ◽  
Author(s):  
William M. Harris ◽  
George J. Nelson ◽  
John R. Izzo ◽  
Kyle N. Grew ◽  
Wilson K. S. Chiu ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Tomographic Reconstruction ◽  
Oxidation States ◽  
Edge Structure ◽  
Full Field ◽  
X Ray ◽  
Oxide Phases ◽  
The Individual ◽  
Cell Anode ◽  
Fuel Cell Anode

A greater understanding of nickel reduction-oxidation cycling (redox) mechanisms at the microstructural level can enhance SOFC performance and reliability. Transmission x-ray microscopy (TXM) provides several techniques for exploring oxidation states within SOFC electrode microstructure. X-ray nanotomography and full field x-ray absorption near edge structure (XANES) spectroscopy are new TXM techniques that have been applied in tandem to study samples of varying nickel (Ni) and nickel oxide (NiO) compositions. The imaged samples are treated as mock SOFC anodes containing distinct Ni and NiO regions. XANES spectra for the individual materials provide a basis for the processing and analysis of these mixed samples. Images of composite samples obtained using x-ray nanotomography are treated using numerical image processing steps including: scaling, tomographic reconstruction, and image alignment and subtraction. The distinct nickel and nickel oxide phases have been uniquely identified using full field XANES nanotomography. Applications to SOFC anodes are discussed.

Oxidation states study of nickel in solid oxide fuel cell anode using x-ray full-field spectroscopic nano-tomography

2012 ◽  
Vol 101 (25) ◽  
pp. 253901 ◽  
Author(s):  
Yu-chen Karen Chen-Wiegart ◽  
William M. Harris ◽  
Jeffrey J. Lombardo ◽  
Wilson K. S. Chiu ◽  
Jun Wang
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Solid Oxide ◽  
Oxidation States ◽  
Oxide Fuel ◽  
Full Field ◽  
X Ray ◽  
Cell Anode ◽  
Fuel Cell Anode

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

2011 ◽  
Vol 98 (17) ◽  
pp. 173109 ◽  
Author(s):  
George J. Nelson ◽  
William M. Harris ◽  
John R. Izzo ◽  
Kyle N. Grew ◽  
Wilson K. S. Chiu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Oxidation States ◽  
Edge Structure ◽  
Full Field ◽  
X Ray ◽  
Nickel Oxidation ◽  
Three Dimensional Mapping ◽  
X Ray Absorption ◽  
Dimensional Mapping

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

2019 ◽  
Vol 35 (1) ◽  
pp. 1315-1321 ◽  
Author(s):  
George Nelson ◽  
William Harris ◽  
John Izzo ◽  
Kyle N. Grew ◽  
Wilson K. Chiu ◽  
...  
Keyword(s):  
3D Imaging ◽  
Oxidation States ◽  
Edge Structure ◽  
Full Field ◽  
X Ray ◽  
Nickel Oxidation ◽  
X Ray Absorption

3D Non-destructive morphological analysis of a solid oxide fuel cell anode using full-field X-ray nano-tomography

2012 ◽  
Vol 218 ◽  
pp. 348-351 ◽  
Author(s):  
Yu-chen Karen Chen-Wiegart ◽  
J. Scott Cronin ◽  
Qingxi Yuan ◽  
Kyle J. Yakal-Kremski ◽  
Scott A. Barnett ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Morphological Analysis ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Full Field ◽  
X Ray ◽  
Cell Anode ◽  
Fuel Cell Anode ◽  
Non Destructive

Instant and Persistent Hydrogen Production Using Nano High Entropy Catalyst

2019 ◽  
Author(s):  
Nirmal Kumar ◽  
Subramanian Nellaiappan ◽  
Ritesh Kumar ◽  
Kirtiman Deo Malviya ◽  
K. G. Pradeep ◽  
...  
Keyword(s):  
Formic Acid ◽  
Minimum Energy ◽  
High Entropy Alloy ◽  
Hydrogen Energy ◽  
High Entropy ◽  
Electro Oxidation ◽  
The Individual ◽  
Novel Catalyst ◽  
Cell Anode ◽  
Fuel Cell Anode

<div>Renewable harvesting clean and hydrogen energy using the benefits of novel multicatalytic materials of high entropy alloy (HEA equimolar Cu-Ag-Au-Pt-Pd) from formic acid with minimum energy input has been achieved in the present investigation. The synthesis effect of pristine elements in the HEA drives the electro-oxidation reaction towards non-carbonaceous pathway . The atomistic simulation based on DFT rationalize the distinct lowering of the d-band center for the individual atoms in the HEA as compared to the pristine counterparts. This catalytic activity of the HEA has also been extended to methanol electro-oxidation to show the unique capability of the novel catalyst. The nanostructured HEA, properties using a combination of casting and cry omilling techniques can further be utilized as fuel cell anode in direct formic acid/methanol fuel cells (DFFE).<br></div>

Full-Field Calcium K-Edge X-ray Absorption Near-Edge Structure Spectroscopy on Cortical Bone at the Micron-Scale: Polarization Effects Reveal Mineral Orientation

2016 ◽  
Vol 88 (7) ◽  
pp. 3826-3835 ◽  
Author(s):  
Bernhard Hesse ◽  
Murielle Salome ◽  
Hiram Castillo-Michel ◽  
Marine Cotte ◽  
Barbara Fayard ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Edge Structure ◽  
Full Field ◽  
Polarization Effects ◽  
X Ray ◽  
X Ray Absorption

Oxygen Reduction Effect on T’-Pr2-xCexCuO4 Nanopowders in the Underdoped Regime Studied by X-Ray Absorption near Edge Structure

2018 ◽  
Vol 936 ◽  
pp. 93-97 ◽  
Author(s):  
Irfanita Resky ◽  
Putu Eka Dharma Putra ◽  
Triono Bambang ◽  
Saiyasombat Chatree ◽  
Kamonsuangkasem Krongthong ◽  
...  
Keyword(s):  
Oxidation State ◽  
Oxidation States ◽  
Edge Structure ◽  
X Ray ◽  
Reduction Annealing ◽  
Gas Atmosphere ◽  
Reduction Effect ◽  
Ar Gas ◽  
X Ray Absorption ◽  
Cu Ions

This research is aimed to examine oxidation state of Copper (Cu) in both as-synthesized and reduced T’-Pr2-xCexCuO4 (T’-PCCO) with x = 0, 0.10, and 0.15 using Cu K-edge x-ray absorption near edge structure (XANES). The T‘-PCCO nanopowders were successfully synthesized by the chemically dissolved method with HNO3 as a dissolving agent continued by calcination at 1000°C for 15 h. The reduced T’-PCCO nanopowders were obtained by reduction annealing process at 700°C for 5 h under Ar gas atmosphere. The analyses of XANES spectra show that oxidation states of the Cu ions in all of the T'-PCCO nanopowders have values between +1 and +2. This indicates the existence of electron doping in the CuO2 planes, even in the undoped T’-structure. It is found that the oxidation states of the Cu ions change after reduction annealing depending on the existence of apical oxygen in the T'-structure. Based on the XANES analyses, it is revealed that the change of oxidation state is influenced by the presence of both electron and hole carriers in the two-carrier model of T’-structure.

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