scholarly journals Characterization of proton exchange membrane materials for fuel cells by solid state nuclear magnetic resonance

2010 ◽  
Author(s):  
Zueqian Kong
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fuel Cells ◽  
Solid State ◽  
Magnetic Resonance ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Membrane Materials ◽  
Exchange Membrane ◽  
Nuclear Magnetic

Solid-State Synthesis of Highly Dispersed Nitrogen-Coordinated Single Iron Atom Electrocatalysts for Proton Exchange Membrane Fuel Cells

Nano Letters ◽  
2021 ◽  
Author(s):  
Fei Xiao ◽  
Xiang Liu ◽  
Cheng-Jun Sun ◽  
Inhui Hwang ◽  
Qi Wang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid State ◽  
Iron Atom ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Solid State Synthesis ◽  
Highly Dispersed ◽  
Exchange Membrane

Synthesis and characterization of novel functionalized perarylated polysiloxane for proton exchange membrane fuel cells

MRS Advances ◽  
2019 ◽  
Vol 4 (64) ◽  
pp. 3579-3585
Author(s):  
Guillermo M. González Guerra ◽  
Alejandro Alatorre-Ordaz ◽  
Gerardo González Garcia ◽  
Jesus S. Jaime-Ferrer
Keyword(s):  
Cyclic Voltammetry ◽  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Area Under The Curve ◽  
Chlorosulfonic Acid ◽  
Proton Exchange ◽  
Synthesis And Characterization ◽  
A Value ◽  
Exchange Membrane

ABSTRACTThis work presents the synthesis and characterization of a pearylated polysiloxane material (PAP) from a polycondensation reaction, followed by functionalization with HClSO3 by an electrophilic substitution reaction. According to the characterization techniques applied, a sulfonated pearylated polysiloxane was also obtained, (SPAP). The purpose of this sulfonated material is to obtain an ionomer able to be applied in hydrogen fuel cells of the proton exchange membrane kind (PEMFC). The reaction to produce the polysiloxane precursor was carried out with the commercial reagents: PhSiCl3, Ph2SiCl2 and Ph3SiCl in anhydrous THF at 75 °C and the SPAP material was obtained by sulfonation of the precursor with chlorosulfonic acid. PAP and SPAP were characterized by 1H, NMR for liquids, 29Si NMR for solids, IR-ATR, SEM, and cyclic voltammetry. The NMR 29Si spectra show that PAP and PAPS contain crosslinking regions due to PhSiCl3, growing chain zones due to Ph2SiCl2 and polymer termination zones due to Ph3SiCl, obtaining a mixture of siloxanes. The analysis by cyclic voltammetry indicates that by integrating the area under the curve of the adsorption peaks of H2, a value of 0.062 mC/cm2 is obtained, a value close to the commercial ionomer of Nafion®.

Solid-State Nuclear Magnetic Resonance Characterization of Chars Obtained from Hydrothermal Carbonization of Corncob and Miscanthus

2012 ◽  
Vol 27 (1) ◽  
pp. 303-309 ◽  
Author(s):  
Lucia Calucci ◽  
Daniel P. Rasse ◽  
Claudia Forte
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
Hydrothermal Carbonization ◽  
Nuclear Magnetic

scholarly journals Solid-state nuclear magnetic resonance characterization of the second generation of the UEC family of molecular sieves

2019 ◽  
Author(s):  
Heitor Secco Seleghini ◽  
Heloise de Oliveira Pastore ◽  
Fábio Aurélio Bonk
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
Molecular Sieves ◽  
Solid State Nmr ◽  
Second Generation ◽  
3D Structures ◽  
Nuclear Magnetic

This work reports the characterization using solid-state NMR of the second generation of the UEC family of molecular sieves, such generation is composed by two tridimensional silicoaluminophosphates synthesized from a layered aluminophosphate (AlPO-CJ70). The 3D structures are analogous to SAPO-5 (UEC-4) and SAPO-15 (UEC-5), both were characterized using multinuclear solid-state NMR, 27Al-MQ-MAS and 29Si{27Al} TRAPDOR.

Fabrication and Characterization of Carbon Fiber Paper for Application of Proton Exchange Membrane Fuel Cells

2014 ◽  
Vol 787 ◽  
pp. 407-411 ◽  
Author(s):  
Kai Yang ◽  
Zhi Yong Xie ◽  
Qi Zhong Huang ◽  
Xian Tang ◽  
Rong Hu
Keyword(s):  
Fuel Cells ◽  
Carbon Content ◽  
Proton Exchange Membrane ◽  
Chemical Vapor ◽  
Heating Time ◽  
Proton Exchange ◽  
Carbon Paper ◽  
Carbon Fiber Paper ◽  
Exchange Membrane

Using the dry method-prepared polyacrylonitrile based carbon fibers as raw the material, carbon paper applied for proton exchange membrane fuel cells was prepared by the processes of molding, high temperature carbonization, chemical vapor deposition (CVD), and graphitization. The effects of resin carbon content and subsequent heat-treatment process parameters on the properties of carbon paper were studied. The results show that: the resin carbon content is an important factor to affect the density, thickness, through-plane resistivity and porosity of carbon paper. When the resin carbon content is 20%, the thickness of carbon paper is 0.20mm, the density is 0.41g/cm3, and the porosity is 74.5%, in line with requirements of the fuel cell. When the heating time is 4 hours, the porosity is 71.9%.

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