scholarly journals Effect of Chemical Structure and Degree of Branching on the Stability of Proton Exchange Membranes Based on Sulfonated Polynaphthylimides

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 652
Author(s):  
Chunmei Gao ◽  
Jiale Chen ◽  
Boping Zhang ◽  
Lei Wang
Keyword(s):  
Oxidative Stability ◽  
Chemical Structure ◽  
Hydrolytic Stability ◽  
Oxidation Stability ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Ether Linkage ◽  
Degree Of Branching ◽  
The Core ◽  
The Stability

Hydrolytic stability and oxidative stability are the core properties of sulfonated polynaphthylimides (SPIs) as proton exchange membranes. The chemical structure of SPIs directly influences the performance. Herein, three different series of branched SPIs were designed and prepared using 1,3,5-tris (2-trifluoromethyl-4-aminophenoxy) benzene as a trifunctional monomer and three non-sulfonated diamine monomers, such as 4,4′-oxydianiline (ODA), 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane (6FODA), and 4,4′-(9-fluorenylidene)dianiline (BFDA). The effect of the chemical structure and degree of branching on SPIs properties is discussed. The results showed that by controlling the chemical structure and degree of branching, the chemical stability of SPIs changed significantly. SPI-6FODA with two ether linkages and a hydrophobic CF3 group has higher hydrolytic stability than SPI-ODA with only one ether linkage. In addition, with the increase of the introduced B3 monomer, the oxidation stability of SPI-6FODA has been greatly improved. We successfully synthesized SPIs with a high hydrolytic stability and oxidative stability.

scholarly journals Pore-Filled Proton-Exchange Membranes with Fluorinated Moiety for Fuel Cell Application

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4433
Author(s):  
Hyeon-Bee Song ◽  
Jong-Hyeok Park ◽  
Jin-Soo Park ◽  
Moon-Sung Kang
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Continuous Process ◽  
Oxidation Stability ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Cross Linking ◽  
Polymer Backbone ◽  
Transfer Resistance ◽  
Exchange Membrane

Proton-exchange membrane fuel cells (PEMFCs) are the heart of promising hydrogen-fueled electric vehicles, and should lower their price and further improve durability. Therefore, it is necessary to enhance the performances of the proton-exchange membrane (PEM), which is a key component of a PEMFC. In this study, novel pore-filled proton-exchange membranes (PFPEMs) were developed, in which a partially fluorinated ionomer with high cross-linking density is combined with a porous polytetrafluoroethylene (PTFE) substrate. By using a thin and tough porous PTFE substrate film, it was possible to easily fabricate a composite membrane possessing sufficient physical strength and low mass transfer resistance. Therefore, it was expected that the manufacturing method would be simple and suitable for a continuous process, thereby significantly reducing the membrane price. In addition, by using a tri-functional cross-linker, the cross-linking density was increased. The oxidation stability was greatly enhanced by introducing a fluorine moiety into the polymer backbone, and the compatibility with the perfluorinated ionomer binder was also improved. The prepared PFPEMs showed stable PEMFC performance (as maximum power density) equivalent to 72% of Nafion 212. It is noted that the conductivity of the PFPEMs corresponds to 58–63% of that of Nafion 212. Thus, it is expected that a higher fuel cell performance could be achieved when the membrane resistance is further lowered.

Polymers application in proton exchange membranes for fuel cells (PEMFCs)

2017 ◽  
Vol 2 (8) ◽  
Author(s):  
Justyna Walkowiak-Kulikowska ◽  
Joanna Wolska ◽  
Henryk Koroniak
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Chemical Structure ◽  
Polymer Membranes ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Synthetic Methods ◽  
Current Status ◽  
Important Research ◽  
Ionic Groups

Abstract This review presents the most important research on alternative polymer membranes with ionic groups attached, provides examples of materials with a well-defined chemical structure that are described in the literature. Furthermore, it elaborates on the synthetic methods used for preparing PEMs, the current status of fuel cell technology and its application. It also briefly discusses the development of the PEMFC market.

Preparation and properties of branched sulfonated poly(arylene ether ketone)/polytetrafluoroethylene composite materials for proton exchange membranes

RSC Advances ◽  
2016 ◽  
Vol 6 (66) ◽  
pp. 61410-61417 ◽  
Author(s):  
Boping Zhang ◽  
Huixiong Xie ◽  
Jiangpeng Ni ◽  
Xiongzhi Xiang ◽  
Qixing Wu ◽  
...  
Keyword(s):  
Composite Materials ◽  
Oxidative Stability ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Arylene Ether ◽  
Ether Ketone ◽  
Sulfonated Poly

Branched sulfonated poly(arylene ether ketone)s (BSPAEKs) exhibit excellent oxidative stability and solubility, making them suitable for proton exchange membranes (PEMs).

scholarly journals A Robust Composite Proton Exchange Membrane of Sulfonated Poly (Fluorenyl Ether Ketone) with an Electrospun Polyimide Mat for Direct Methanol Fuel Cells Application

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 523
Author(s):  
Geng Cheng ◽  
Zhen Li ◽  
Shan Ren ◽  
Dongmei Han ◽  
Min Xiao ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Composite Membrane ◽  
Direct Methanol Fuel Cells ◽  
Oxidation Stability ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Direct Methanol ◽  
Ether Ketone ◽  
Methanol Fuel Cells ◽  
Sulfonated Poly

As a key component of direct methanol fuel cells, proton exchange membranes with suitable thickness and robust mechanical properties have attracted increasing attention. On the one hand, a thinner membrane gives a lower internal resistance, which contributes highly to the overall electrochemical performance of the cell, on the other hand, strong mechanical strength is required for the application of proton exchange membranes. In this work, a sulfonated poly (fluorenyl ether ketone) (SPFEK)-impregnated polyimide nanofiber mat composite membrane (PI@SPFEK) was fabricated. The new composite membrane with a thickness of about 55 μm exhibited a tensile strength of 35.1 MPa in a hydrated state, which is about 65.8% higher than that of the pristine SPFEK membrane. The antioxidant stability test in Fenton’s reagent shows that the reinforced membrane affords better oxidation stability than does the pristine SPFEK membrane. Furthermore, the morphology, proton conductivity, methanol permeability, and fuel cell performance were carefully evaluated and discussed.

scholarly journals States of water in proton exchange membranes: Part A - Influence of chemical structure and composition

Polymer ◽  
2017 ◽  
Vol 111 ◽  
pp. 297-306 ◽  
Author(s):  
Abhishek Roy ◽  
Michael A. Hickner ◽  
Hae-Seung Lee ◽  
Tom Glass ◽  
Mou Paul ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Proton Exchange Membranes ◽  
Proton Exchange

Synthesis and Characterization of Polyurethanic Proton Exchange Membranes

2011 ◽  
Vol 8 (5) ◽  
Author(s):  
A. Bottino ◽  
G. Capannelli ◽  
A. Comite ◽  
C. Costa
Keyword(s):  
Proton Exchange Membrane ◽  
Proton Exchange Membranes ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Methanol Permeability ◽  
Sulfonic Group ◽  
Isethionic Acid ◽  
The Stability ◽  
Exchange Membrane

Novel proton exchange membranes have been prepared by in synthesis functionalization of a polyurethane matrix with a sulfonic group containing chain terminals. The synthesis procedure was based on the use of two polyethylene glycols with nominal molecular weight of 300 and 1 k and 4,4′ dicyclohexylmethane diisocyanate in presence of the sodium salt of isethionic acid as a donor of the sulfonic group. Glycerol was added in order to improve by reticulation the stability of the cast films. The membranes were characterized in terms of swelling, morphology, methanol permeability, proton conductivity, and ion exchange capacity. The best H2/air cell performance was achieved at 80 °C with a maximum power density of 16.9 mW/cm2 at a voltage of about 0.35 V. Polyurethane based ionomeric membranes have proved to be interesting candidates for proton exchange membrane fuel cells (PEMFC) applications.

New sulfonated poly(arylene ether sulfone) copolymers containing phenyl side chains as proton exchange membranes

2016 ◽  
Vol 40 (4) ◽  
pp. 3755-3762 ◽  
Author(s):  
RiMing Chen ◽  
Guang Li
Keyword(s):  
Chemical Structure ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Side Chains ◽  
Arylene Ether ◽  
Phase Images ◽  
Sulfonated Poly

The chemical structure and phase images of the SPAES-PQ-40 membrane.

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