In operando synchrotron X-ray radiography studies of polymer electrolyte membrane water electrolyzers

2015 ◽  
Vol 55 ◽  
pp. 55-59 ◽  
Author(s):  
Michael A. Hoeh ◽  
Tobias Arlt ◽  
Ingo Manke ◽  
John Banhart ◽  
David L. Fritz ◽  
...  
Keyword(s):  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
X Ray ◽  
Electrolyte Membrane ◽  
In Operando

Roles of Photon Scattering in Synchrotron X-ray Radiography of In Operando Visualizations of the Polymer Electrolyte Membrane Fuel Cell

2016 ◽  
Vol 75 (14) ◽  
pp. 261-274 ◽  
Author(s):  
N. Ge ◽  
S. Chevalier ◽  
J. Hinebaugh ◽  
M. G. George ◽  
J. Lee ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Photon Scattering ◽  
X Ray ◽  
Electrolyte Membrane ◽  
In Operando

Neutron radiographic in operando investigation of water transport in polymer electrolyte membrane fuel cells with channel barriers

2017 ◽  
Vol 148 ◽  
pp. 604-610 ◽  
Author(s):  
Saad S. Alrwashdeh ◽  
Ingo Manke ◽  
Henning Markötter ◽  
Jan Haußmann ◽  
Nikolay Kardjilov ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Water Transport ◽  
Polymer Electrolyte Membrane ◽  
Electrolyte Membrane ◽  
In Operando

Synchrotron X-Ray Tomography Investigation of Fundamental Degradation Mechanisms in Polymer Electrolyte Membrane Water Electrolyzers

2021 ◽  
Vol MA2021-01 (49) ◽  
pp. 1964-1964
Author(s):  
Sarah F Zaccarine ◽  
Johanna Nelson Weker ◽  
Meital Shviro ◽  
Michael Dzara ◽  
Jayson Foster ◽  
...  
Keyword(s):  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Degradation Mechanisms ◽  
X Ray ◽  
Electrolyte Membrane

Electronic Structures of Non-Pt Carbon Alloy Catalysts for Polymer Electrolyte Membrane Fuel Cells Revealed by Synchrotron Radiation Analyses

2011 ◽  
Vol 1318 ◽  
Author(s):  
Masaharu Oshima ◽  
Hideharu Niwa ◽  
Makoto Saito ◽  
Masaki. Kobayashi ◽  
Koji Horiba ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Active Site ◽  
Electronic Structures ◽  
Polymer Electrolyte Membrane ◽  
Pt Catalysts ◽  
X Ray ◽  
Electrolyte Membrane ◽  
X Ray Absorption ◽  
Alloy Catalysts

ABSTRACTThe oxygen reduction reaction (ORR) mechanism of non-Pt catalysts was elucidated by investigating electronic structures of carbon alloy catalysts (CACs) for polymer electrolyte membrane fuel cells (PEMFC). For metal phthalocyanine-based carbon alloy catalysts with 1-2% of nitrogen and less than 0.1% of Co or Fe, photoelectron spectroscopy, X-ray absorption spectroscopy (XAS), and X-ray Absorption Fine Structure (XAFS) have revealed that Co or Fe metal sites are not the ORR active site, whereas the carbon atoms adjacent to graphitic nitrogens at a zigzag edge of graphite may act as the ORR active site, which is in good agreement with first principles calculations. These studies have also revealed that the zigzag edges, detected as a XAS shoulder component, are well evolved for catalysts pyrolyzed at 600°C, which show the maximum ORR activity. Based on these analyses, we have realized significantly improved carbon alloy based ORR performance, up to about 70 % of that with Pt catalysts. Further, to analyze the electronic structure of CACs during operation, we constructed a new in situ soft X-ray emission spectroscopy system with very high energy resolution (ΔE) of 120 meV at 640 eV at the University of Tokyo beamline BL07LSU in SPring-8.

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