scholarly journals Facile Fabrication and Characterization of Improved Proton Conducting Sulfonated Poly(Arylene Biphenylether Sulfone) Blocks Containing Fluorinated Hydrophobic Units for Proton Exchange Membrane Fuel Cell Applications

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1367 ◽  
Author(s):  
Kyu Lee ◽  
Ji Chu ◽  
Ae Kim ◽  
Dong Yoo
Keyword(s):  
Proton Exchange Membrane ◽  
Domain Size ◽  
Gel Permeation Chromatography ◽  
Proton Exchange ◽  
Ex Situ ◽  
Molar Ratio ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Saxs Measurement ◽  
Sulfonated Poly

Sulfonated poly(arylene biphenylether sulfone)-poly(arylene ether) (SPABES-PAE) block copolymers by controlling the molar ratio of SPABES and PAE oligomers were successfully synthesized, and the performances of SPABES-PAE (1:2, 1:1, and 2:1) membranes were compared with Nafion 212. The prepared membranes including fluorinated hydrophobic units were stable against heat, nucleophile attack, and physio-chemical durability during the tests. Moreover, the polymers exhibited better solubility in a variety of solvents. The chemical structure of SPABES-PAEs was investigated by 1H nuclear magnetic resonance (1H NMR), Fourier transform infrared spectroscopy (FT-IR), and gel permeation chromatography (GPC). The membrane of SPABES-PAEs was fabricated by the solution casting method, and the membranes were very flexible and transparent with a thickness of 70–90 μm. The morphology of the membranes was observed using atomic force microscope and the ionic domain size was proved by small angle X-ray scattering (SAXS) measurement. The incorporation of polymers including fluorinated units allowed the membranes to provide unprecedented oxidative and dimensional stabilities, as verified from the results of ex situ durability tests and water uptake capacity, respectively. By the collective efforts, we observed an enhanced water retention capacity, reasonable dimensional stability and high proton conductivity, and the peak power density of the SPABES-PAE (2:1) was 333.29 mW·cm−2 at 60 °C under 100% relative humidity (RH).

Proton exchange membrane bearing entangled structure: Sulfonated poly(ether ether ketone)/bismaleimide hyperbranch

Polymer ◽  
2010 ◽  
Vol 51 (6) ◽  
pp. 1386-1394 ◽  
Author(s):  
Peter P. Chu ◽  
Chien-Shun Wu ◽  
Po-Chun Liu ◽  
Tsung-Hsiung Wang ◽  
Jin-Ping Pan
Keyword(s):  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Exchange Membrane ◽  
Sulfonated Poly

Crosslinked sulfonated poly(arylene ether sulfone)/silica hybrid membranes for high temperature proton exchange membrane fuel cells

2013 ◽  
Vol 51 ◽  
pp. 22-28 ◽  
Author(s):  
Jeong Hwan Chun ◽  
Sang Gon Kim ◽  
Ji Young Lee ◽  
Dong Hun Hyeon ◽  
Byung-Hee Chun ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Hybrid Membranes ◽  
Arylene Ether ◽  
Exchange Membrane ◽  
Silica Hybrid ◽  
Sulfonated Poly

A novel approach to prepare photocrosslinked sulfonated poly(arylene ether sulfone) for proton exchange membrane

2014 ◽  
Vol 463 ◽  
pp. 58-64 ◽  
Author(s):  
Pushan Wen ◽  
Zhenxin Zhong ◽  
Lizhong Li ◽  
Fengshan Shen ◽  
Xiang-Dan Li ◽  
...  
Keyword(s):  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Arylene Ether ◽  
Novel Approach ◽  
Exchange Membrane ◽  
Sulfonated Poly

Mitigation of PtCo/C Cathode Catalyst Degradation via Control of Relative Humidity

2021 ◽  
Author(s):  
Nagappan Ramaswamy ◽  
Swami Kumaraguru ◽  
Ratandeep Singh Kukreja ◽  
Daniel Groom ◽  
Karalee Jarvis ◽  
...  
Keyword(s):  
Relative Humidity ◽  
High Performance ◽  
Proton Exchange Membrane ◽  
Stress Test ◽  
Catalyst Layer ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Ex Situ ◽  
Primary Power ◽  
Ptco Alloy

Abstract Maintaining the high performance of proton-exchange membrane fuel cells (PEMFC) over the course of its lifetime is a key enabling factor for its successful commercialization as a primary power source in zero-emission transportation applications. In this context, it is important to mitigate the degradation of PtCo-alloy based cathode catalysts used for oxygen reduction reaction (ORR). PtCo-alloy catalysts exhibit high activity at beginning-of-life (BOL) which tends to decrease during operation due to loss of electrochemical surface area (ECSA) and dissolution-contamination related effects of the Co-alloying component. Here, we demonstrate the use of relative humidity (RH) of the inlet gases as a controllable parameter to mitigate the degradation of PtCo-alloy catalyst degradation. We employ a catalyst-specific voltage cycling accelerated stress test (AST) durability protocol as a function of inlet RH to degrade PtCo catalysts. A series of in situ electrochemical diagnostics and ex situ characterizations have been carried out to investigate the catalyst layer characteristics at end-of-test (EOT). Our results show that at sub-saturated conditions of durability protocol operation, PtCo catalyst sustains higher EOT H2/air performance due to better retention of ECSA and smaller impact of Co2+ dissolution/contamination.

scholarly journals Preparation and Study of Sulfonated Co-Polynaphthoyleneimide Proton-Exchange Membrane for a H2/Air Fuel Cell

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5297
Author(s):  
Ulyana M. Zavorotnaya ◽  
Igor I. Ponomarev ◽  
Yulia A. Volkova ◽  
Alexander D. Modestov ◽  
Vladimir N. Andreev ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Proton Exchange Membrane ◽  
Maximum Output Power ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Molar Ratio ◽  
Disulfonic Acid ◽  
Membrane Electrode ◽  
Maximum Output ◽  
Practical Applications

The sulfonated polynaphthoyleneimide polymer (co-PNIS70/30) was prepared by copolymerization of 4,4′-diaminodiphenyl ether-2,2′-disulfonic acid (ODAS) and 4,4’-methylenebisanthranilic acid (MDAC) with ODAS/MDAC molar ratio 0.7/0.3. High molecular weight co-PNIS70/30 polymers were synthesized either in phenol or in DMSO by catalytic polyheterocyclization in the presence of benzoic acid and triethylamine. The titration reveals the ion-exchange capacity of the polymer equal to 2.13 meq/g. The membrane films were prepared by casting polymer solution. Conductivities of the polymer films were determined using both in- and through-plane geometries and reached ~96 and ~60 mS/cm, respectively. The anisotropy of the conductivity is ascribed to high hydration of the surface layer compared to the bulk. SFG NMR diffusometry shows that, in the temperature range from 213 to 353 K, the 1H self-diffusion coefficient of the co-PNIS70/30 membrane is about one third of the diffusion coefficient of Nafion® at the same humidity. However, temperature dependences of proton conductivities of Nafion® and of co-PNIS70/30 membranes are nearly identical. Membrane–electrode assemblies (MEAs) based on co-PNIS70/30 were fabricated by different procedures. The optimal MEAs with co-PNIS70/30 membranes are characterized by maximum output power of ~370 mW/cm2 at 80 °C. It allows considering sulfonated co-PNIS70/30 polynaphthoyleneimides membrane attractive for practical applications.

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