Effects of micro-phase-separated structures on proton conductivity and methanol permeability in polymer electrolyte membranes

Onuma, Atsuhiko; Kawaji, Jun; Murase, Makoto; Mizukami, Takaaki; Takamori, Yoshiyuki; Yamaga, Kenji

doi:10.1016/j.polymer.2014.03.056

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…Next, we extended our study to explore folded protein backbones. In synthetic ion-conducting polymers, the proton transport has been augmented by the introduction of nanostructures and phase separation (31,32). Thus, it is reasonable to investigate folded nanosized proteins.…”

Section: Resultsmentioning

confidence: 99%

De novo rational design of a freestanding, supercharged polypeptide, proton-conducting membrane

Dong

Viviani

et al. 2020

Sci. Adv.

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Proton translocation enables important processes in nature and man-made technologies. However, controlling proton conduction and fabrication of devices exploiting biomaterials remains a challenge. Even more difficult is the design of protein-based bulk materials without any functional starting scaffold for further optimization. Here, we show the rational design of proton-conducting, protein materials exceeding reported proteinaceous systems. The carboxylic acid–rich structures were evolved step by step by exploring various sequences from intrinsically disordered coils over supercharged nanobarrels to hierarchically spider β sheet containing protein-supercharged polypeptide chimeras. The latter material is characterized by interconnected β sheet nanodomains decorated on their surface by carboxylic acid groups, forming self-supportive membranes and allowing for proton conduction in the hydrated state. The membranes showed an extraordinary proton conductivity of 18.5 ± 5 mS/cm at RH = 90%, one magnitude higher than other protein devices. This design paradigm offers great potential for bioprotonic device fabrication interfacing artificial and biological systems.

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Section: Resultsmentioning

confidence: 99%

De novo rational design of a freestanding, supercharged polypeptide, proton-conducting membrane

Dong

Viviani

et al. 2020

Sci. Adv.

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“…This kind of polymers can be subdivided into: aliphatic copolymers synthesized by free radical polymerization 133–140, plasma‐polymerization 141–144, ring‐opening polymerization 145, 146, ATRP 147 and RAFT 148, random aromatic copolymers 149–175, copolymers with locally high concentration of ammonium moieties 176–184, and multi‐block copolymers 185–190, especially with long hydrophilic/hydrophobic blocks 191–197.…”

Section: Aems For Aemfcsmentioning

confidence: 99%

Anion‐Exchange Membranes for Fuel Cells: Synthesis Strategies, Properties and Perspectives

et al. 2015

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This review focuses on various synthesis strategies of anion‐exchange membranes (AEMs) for fuel cells, diverse methodologies of AEM‐forming, together with relationship between structures and properties. AEMs are discussed from seven categories, including (1) AEMs derived from Nafion precursors with sulfonyl fluoride groups, which display excellent stability and well‐developed morphologies that similar to Nafion, but has potentially high costs. (2) AEMs prepared by grafting technologies, such as chemical grafting technique, ATRP technique, plasma grafting technique and radiation grafting technique. (3) AEMs based on functionalized commercial polymers, including PVA, SEBS, CPP, PEEK, PES, PEI, PPO, and so on. (4) AEMs prepared by newly‐synthesized polymers, in which the most interesting approach is to synthesize alkaline multi‐block copolymers with enough long hydrophilic/hydrophobic blocks. (5) AEMs containing heterogeneous composition, which mainly prepared by blending and sol‐gel methods, reinforced or pore‐filling AEMs and IPN or s‐IPN. (6) AEMs with functional groups different from quaternary ammonium, which includes the studies of new type of AEMs with highly chemical stability in alkaline solution. (7) Hybrid membranes combining AEM with PEM, in which new configuration results in different performances. At last, conclusions and perspectives for the future researches of AEMs are presented.

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Solvent‐Induced Rearrangement of Ion‐Transport Channels: A Way to Create Advanced Porous Membranes for Vanadium Flow Batteries

Lü

Yuan

et al. 2016

Adv Funct Materials

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Porous membranes with critically hydrophobic/hydrophilic phase‐separated‐like structures for use in vanadium flow battery application are first realized by solvent‐induced reassembly of a polymer blend system. Porous poly(ether sulfone) (PES)/sufonated poly(ether ether ketone) (SPEEK) blend membranes with tunable pore size are prepared via the phase inversion method. After solidification, isopropanol (IPA) is introduced to induce the reassembly of sulfonated groups and further form ion‐transport channels by using the interaction between IPA and functional groups in SPEEK. As a result, a highly phase separated membrane structure is created, composed of a highly stable hydrophobic porous PES matrix and hydrophilic interconnected small pores. The charged pore walls are highly beneficial to improving proton conductivity, while pores are simultaneously shrunk during the IPA treatment. Therefore, the resultant membranes show an excellent battery performance with a coulombic efficiency exceeding 99%, along with an energy efficiency over 91%, which is among the highest values ever reported. This article supplies an ease‐to‐operate and efficient method to create membranes with controlled ion‐transport channels.

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Effects of micro-phase-separated structures on proton conductivity and methanol permeability in polymer electrolyte membranes

Cited by 7 publications

References 14 publications

De novo rational design of a freestanding, supercharged polypeptide, proton-conducting membrane

De novo rational design of a freestanding, supercharged polypeptide, proton-conducting membrane

Anion‐Exchange Membranes for Fuel Cells: Synthesis Strategies, Properties and Perspectives

Solvent‐Induced Rearrangement of Ion‐Transport Channels: A Way to Create Advanced Porous Membranes for Vanadium Flow Batteries

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