What is the true nature of conducting proton in perovskite ceramic membrane: hydroxyl ion or interstitial proton ?

2011 ◽  
Vol 1309 ◽  
Author(s):  
Aneta Slodczyk ◽  
Philippe Colomban ◽  
Oumaya Zaafrani ◽  
Olivier Lacroix ◽  
Johan Loricourt ◽  
...  
Keyword(s):  
Ceramic Membrane ◽  
Proton Conductors ◽  
True Nature ◽  
Elastic Neutron ◽  
Water Steam ◽  
Hydroxyl Ion ◽  
Electrolyte Membranes ◽  
Process Complexity ◽  
Conducting Species ◽  
Perovskite Ceramic

ABSTRACTThe proton conducting perovskites are widely investigated due to their high potential as electrolyte membranes of fuel cells, water steam electrolysers and CO2/syngas converters. Our comprehensive spectroscopic (Raman, IR, neutron), thermogravimetric, elastic and quasi-elastic neutron diffusion as well as conductivity studies performed on Ln/RE- modified zirconate ceramics with controlled densification (90-99% of theoretical density) reveal the important differences between the surface and bulk protonic species. The results clearly show that trivialization of the protonation process complexity can favorite the adsorption of the surface protonic species (hydroxide, hydrocarbonates, etc), prohibit the incorporation of bulk protons, i.e. species responsible for the proton conduction and confuse the understanding of fundamental aspects concerning the proton conductors such as the true nature of conducting species. Our studies reveal that OH- ions are located at the surface of poor densified ceramic and the bulk conducting protons exhibit an ionic, free of covalent-bonded nature.

scholarly journals Highly Dispersed CeOx Hybrid Nanoparticles for Perfluorinated Sulfonic Acid Ionomer–Poly(tetrafluoethylene) Reinforced Membranes with Improved Service Life

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 143 ◽  
Author(s):  
Juhee Ahn ◽  
Mobina Irshad Ali ◽  
Jun Hyun Lim ◽  
Yejun Park ◽  
In Kee Park ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Polymer Electrolyte Membranes ◽  
Proton Conductors ◽  
Operating Conditions ◽  
Hybrid Nanoparticles ◽  
Oh Groups ◽  
Electrolyte Membranes ◽  
Perfluorinated Sulfonic Acid ◽  
Induced Decomposition ◽  
Level 2

CeOx hybrid nanoparticles were synthesized and evaluated for use as radical scavengers, in place of commercially available Ce(NO3)3 and CeO2 nanoparticles, to avoid deterioration of the initial electrochemical performance and/or spontaneous aggregation/precipitation issues encountered in polymer electrolyte membranes. When CeOx hybrid nanoparticles were used for membrane formation, the resulting membranes exhibited improved proton conductivity (improvement level = 2–15% at 30–90 °C), and thereby electrochemical single cell performance, because the –OH groups on the hybrid nanoparticles acted as proton conductors. In spite of a small amount (i.e., 1.7 mg/cm3) of introduction, their antioxidant effect was sufficient enough to alleviate the radical-induced decomposition of perfluorinated sulfonic acid ionomer under a Fenton test condition and to extend the chemical durability of the resulting reinforced membranes under fuel cell operating conditions.

A SEM/TEM examination of a ceramic membrane

1986 ◽  
Vol 44 ◽  
pp. 682-683
Author(s):  
C.E. Voegele-Kliewer ◽  
A.D. McMaster ◽  
G.W. Dirks
Keyword(s):  
Electron Microscopy ◽  
Gas Separation ◽  
Ceramic Membrane ◽  
Hydrogen Iodide ◽  
Separation Processes ◽  
Corning Glass ◽  
Gas Transport Properties ◽  
Porous Microstructure ◽  
Microscopy Techniques ◽  
The Relationship

Materials other than polymers, e.g. ceramic silicates, are currently being investigated for gas separation processes. The permeation characteristics of one such material, Vycor (Corning Glass #1370), have been reported for the separation of hydrogen from hydrogen iodide. This paper will describe the electron microscopy techniques applied to reveal the porous microstructure of a Vycor membrane. The application of these techniques has led to an increased understanding in the relationship between the substructure and the gas transport properties of this material.

Talking Loud and Saying Nothing

2019 ◽  
Vol 8 (4) ◽  
pp. 100-105 ◽  
Author(s):  
Elizabeth F. Desnoyers-Colas
Keyword(s):  
Campus Climate ◽  
White Privilege ◽  
White Administrators ◽  
Institutional Practices ◽  
Systemic Racism ◽  
True Nature ◽  
Predominantly White Institution ◽  
The Road ◽  
White Institution ◽  
White Allies

The road a predominantly white institution (PWI) takes to maximize diversity, inclusion, and equity can be fraught with challenges. One midsize institution learned through an assessment of its campus climate that its institutional practices and arrangements impeded diversity, inclusion, and equity despite white administrators' beliefs to the contrary. To help quell systemic racism habits, monthly campus-wide workshops focused on several key racial injustice habits and hurtful microaggressions generated from white privilege. A faux social justice allure to white allies who considered themselves advocates of nondominant people is one that should ultimately call into question the genuineness and true nature of their support. This semi-autoethnographic essay is a plaintive call to white colleagues in the academy to earnestly acknowledge white privilege and to use it to actively fight the destructive force of racial battle fatigue and institutional racism.

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