Enhanced proton conductivity of sulfonated poly(arylene ether ketone sulfone) polymers by incorporating phosphotungstic acid-ionic-liquid-functionalized metal-organic framework

Wang

ACS Appl. Energy Mater.

et al. 2021

High-performance composite proton exchange membranes (PEMs) [SP/SO4-metal-organic framework (MOF)-808@GO] consisting of sulfonated poly(ether ether ketone) and superacid SO4-MOF-808@GO are fabricated in this work. The composite PEMs obtain higher proton conductivity and fuel cell performance than pure SP. SO4-MOF-808 grains are uniformly deposited on the GO surface, which prevents the agglomeration of the MOF grains and thus ensures a good dispersity of MOFs in the membranes. The superacid sites in SO4-MOF-808@GO bind abundant water, which enhances proton transfer at a low humidity. The water retention ability of the SP/SO4-MOF-808@GO composite membrane outperforms that of pure SP. Benefiting from the optimized SO4-MOF-808@GO structure, the proton conductivity of SP/SO4-MOF-808@GO is up to 0.196 S cm–1 under 70 °C–90% RH and 0.0434 S cm–1 under 90 °C–40% RH, 2.63- and 7.44-fold that of pure SP, respectively. Moreover, the single cell assembled with SP/SO4-MOF-808@GO attains a 70.28% increase over pure SP in power density. Collectively, the results suggest that the SP/SO4-MOF-808@GO membrane has potential application in PEMs.

Section: Resultsmentioning

confidence: 99%

Enhanced Performance of Sulfonated Poly(ether ether Ketone) Hybrid Membranes by Introducing Sulfated MOF-808/Graphene Oxide Composites

Wang

ACS Appl. Energy Mater.

et al. 2021

“…The experimental results displayed that the highest ionic conductivity in the range of 30 mS/cm occurred while dissolving PMMA-PSS in acetonitrile and ILs. Zhang et al [147] studied the enhancement of SPAEKS-based PEMS by the introduction of [EMIM][N(Tf) 2 ] IL, MIL-100 metal organic framework, and phosphotungstic acid (HPW). Membranes based on SPAEKS with HPW-ILs@MIL-100 showed an outstanding conductivity of 138 mS/cm at 100 • C. Wang et al [148] synthesized a series of sulfonated poly(arylene ether ketone ketone sulfone) SPAEKKS polymers for PEMFC applications.…”

Section: Other Polymer-based Pemmentioning

confidence: 99%

A Critical Review on the Use of Ionic Liquids in Proton Exchange Membrane Fuel Cells

et al. 2022

This work provides a comprehensive review on the incorporation of ionic liquid (ILs) into polymer blends and their utilization as proton exchanges membranes (PEM). Various conventional polymers that incorporate ILs are discussed, such as Nafion, poly (vinylidene fluoride), polybenzimidazole, sulfonated poly (ether ether ketone), and sulfonated polyimide. The methods of synthesis of IL/polymer composite membranes are summarized and the role of ionic liquids as electrolytes and structure directing agents in PEM fuel cells (PEMFCs) is presented. In addition, the obstacles that are reported to impede the development of commercial polymerized IL membranes are highlighted in this work. The paper concludes that the presence of certain ILs can increase the conductivity of the PEM, and consequently, enhance the performance of PEMFCs. Nevertheless, the leakage of ILs from composite membranes as well as the limited long-term thermal and mechanical stability are considered as the main challenges that limit the employment of IL/polymer composite membranes in PEMFCs, especially for high-temperature applications.

Intl J of Energy Research

“…Sulfonated aromatic polymers were extensively concerned in the discipline of proton exchange membranes (PEMs). 8,9 Zhao et al prepared a kind of novel main-chain type cross-linked sulfonated aromatic membranes. The proton conductivity of cross-linked membrane with the weight of 15% PVA reached up to 0.18 S cm À1 at 80 C (100% RH).…”

Section: Introductionmentioning

confidence: 99%

“…Researchers find that sulfonated aromatic polymers have fantastic thermal stability, chemical steadiness, and mechanical strength. Sulfonated aromatic polymers were extensively concerned in the discipline of proton exchange membranes (PEMs) 8,9 . Zhao et al prepared a kind of novel main‐chain type cross‐linked sulfonated aromatic membranes.…”

Section: Introductionmentioning

confidence: 99%

Construction of effective transmission channels by anchoring metal‐organic framework on side‐chain sulfonated poly(arylene ether ketone sulfone) for fuel cells

Shi

et al. 2022

Self Cite

A series of novel organic-inorganic hybrid membranes assembled by side-chain type sulfonated poly(arylene ether ketone sulfone) with amino groups (Am-SPAEKS-DBS) and ZIF-67 were prepared. Am-SPAEKS-DBS containing double bonds was synthesized by condensation polymerization, and the AMPS was grafted onto the main chain by post sulfonation. ZIF-67 was prepared by an ordinary solvent method. The structures of ZIF-67, Am-SPAEKS-DBS, and hybrid membranes were analyzed by proton nuclear magnetic resonance ( 1 H NMR), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and Fourier transform infrared (FT-IR). All hybrid membranes had good dimensional stability and excellent oxidation stability. In addition, the swelling ratios of all hybrid membranes were low (<17.46%) at even 100 C, and the oxidative stability was higher than 92%. The proton conductivities of this series of membranes were much higher (0.0540.069 S cm À1 at 30 C, 0.088-0.116 S cm À1 at 80 C) than pure membrane (0.038 S cm À1 at 30 C, 0.076 S cm À1 at 80 C).The experimental results exhibited that the comprehensive properties of hybrid membranes are good, and hybrid membranes had substantially possible as proton exchange membranes. Highlights• Metal-organic frameworks were anchored on side-chain type organic polymer backbone.• The hybrid PEMs showed good dimensional stability and excellent oxidation stability.• The imidazole as a ligand in ZIF-67 contributes a part of the dissociated protons. K E Y W O R D Sorganic-inorganic hybrid membranes, proton conductivities, side-chains, sulfonated poly(arylene ether ketone sulfone), ZIF-67 Mengchi Ju and Qingyuan Shi contributed equally to this work.