Self‐Healing Proton‐Exchange Membranes Composed of Nafion–Poly(vinyl alcohol) Complexes for Durable Direct Methanol Fuel Cells

Li, Yixuan; Liang, Liang; Liu, Changpeng; Li, Yang; Wang, Xing; Sun, Junqi

doi:10.1002/adma.201707146

Cited by 137 publications

(87 citation statements)

References 55 publications

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“…Nafion is a proton conductor with almost no movable anions and electrons inside it. Hence, the fingerprinted hysteresis loops of Nafion‐based memristor obtained under ambient atmosphere may stem from the accumulation or dissipation of protons (in form of hydronium) in the hydrogen bond network . This has been confirmed by Figure S8 (Supporting Information) where no hysteresis loop is detected in the measurements carried out inside the glove box with water coverage less than 0.1 ppm.…”

Section: Resultsmentioning

confidence: 58%

“…Specifically, the migration of protons is affected by the trade‐off between electric‐field‐driven drift and concentration‐gradient‐driven diffusion of protons . Under positive bias where Nafion could continuously absorb water from the air,[33a] the directions of electric field and proton concentration gradient are the same. When 0 to 0.5 V bias sweeping is applied on the Au TE, the protons drift along the electric field to the ITO BE.…”

Section: Resultsmentioning

confidence: 99%

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Bioinspired Artificial Sensory Nerve Based on Nafion Memristor

Zhang

Zhou

et al. 2019

Adv Funct Materials

244

230

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Bioinspired artificial haptic neuron system has received much attention in the booming artificial intelligence industry for its broad range of high-impact applications such as personal healthcare monitoring, electronic skins, and human-machine interfaces. An artificial haptic neuron system is designed by integrating a piezoresistive sensor and a Nafion-based memristor for the first time in this paper. The piezoresistive sensor serves as a sensory receptor to transform mechanical stimuli into electric signals, and the Nafion-based memristor serves as the synapse to further process the information. The pyramid-structured sensor exhibits excellent sensitivity (6.7 × 10 7 kPa −1 in 1-5 kPa and 3.8 × 10 5 kPa −1 in 5-50 kPa) and durability (>7000 cycles), while the memristor realizes fundamental synaptic functions under low power consumption (10-200 pJ) and remains stable for over 10 4 consecutive tests. The integrated system can detect tactile stimuli encoded with temporal information, such as the count, frequency, duration and speed of the external force. As a proof-of-concept, English characters recognition with high accuracy can be achieved on the system under a supervised learning method. This work shows promising potential in bioinspired sensing systems owing to the high performance, excellent durability, and simple fabrication procedure.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Bioinspired Artificial Sensory Nerve Based on Nafion Memristor

Zhang

Zhou

et al. 2019

Adv Funct Materials

244

230

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“…Polymeric complexes can be produced by mixing polymers with complementary noncovalent interactions in bulk solution or sequentially at interface of solid substrates and polymer solutions . Given that various polymers bearing complementary interactions can be employed to prepare polymeric complexes, polymeric composite materials based on polymeric complexes can possess various compositions, controllable cross‐linking density, and well‐tailored mechanical properties .…”

Section: Summary Of Mechanical Properties Of the Paa–pvpon Compositesmentioning

confidence: 99%

“…Given that various polymers bearing complementary interactions can be employed to prepare polymeric complexes, polymeric composite materials based on polymeric complexes can possess various compositions, controllable cross‐linking density, and well‐tailored mechanical properties . During the formation of polymeric complexes, polymers with self‐assembly ability can generate well‐designed micro‐/nanosized structures, which provide a facile way to further tailor the mechanical properties of the resultant materials . Similar to supramolecular polymers, the reversible noncovalent interaction among polymer chains can also endow polymeric composite materials composed of polymeric complexes with satisfactory healing capability .…”

Section: Summary Of Mechanical Properties Of the Paa–pvpon Compositesmentioning

confidence: 99%

“…During the formation of polymeric complexes, polymers with self‐assembly ability can generate well‐designed micro‐/nanosized structures, which provide a facile way to further tailor the mechanical properties of the resultant materials . Similar to supramolecular polymers, the reversible noncovalent interaction among polymer chains can also endow polymeric composite materials composed of polymeric complexes with satisfactory healing capability . Polymer composites based on polymeric complexes exhibit several distinctive advantages over supramolecular polymers which include simple preparation, low cost, and high‐yield production .…”

Section: Summary Of Mechanical Properties Of the Paa–pvpon Compositesmentioning

confidence: 99%

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Healable and Mechanically Super‐Strong Polymeric Composites Derived from Hydrogen‐Bonded Polymeric Complexes

et al. 2019

Self Cite

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of damaging−healing process in a given region without concern about depletion of healing agents. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] However, the fabrication of intrinsic self-healing/healable polymer materials with strong mechanical strength remains a great challenge because the diffusion of polymer chains, which is the prerequisite for the healing function, is largely hindered. [3,5,16] By using dense thiourea hydrogen bonds as reversible cross-linkers, Aida and coworkers have fabricated self-healing poly(ether-thioureas) with a tensile stress of 45 ± 8 MPa and an elastic modulus of 1.4 GPa. [3] The poly(ether-thioureas) is by far the mechanically strongest polymers capable of healing physical damage at room temperature. Unlike conventional polymers based on covalent bonds, supramolecular polymers are constructed from monomeric units that are connected through noncovalent interactions such as hydrogen bonding, host-guest interactions, metal coordination, π-π stacking interactions, and so forth. [10,[17][18][19][20][21][22][23] The dynamic nature of noncovalent interactions endows supramolecular polymers with various unique properties such as stimulus response, [23,24] self-healing, [10,22,25,26] and recycling abilities. [27,28] On account of dynamic and weak nature of noncovalent interactions among monomeric units, the molecular weight of supramolecular polymers is usually low and the entanglement of short polymer chains is severely limited. [17,20] Therefore, most supramolecular polymers are soft and are unsuitable for the fabrication of self-healing/healable polymer materials with high mechanical strength.Polymeric complexes can be produced by mixing polymers with complementary noncovalent interactions in bulk solution or sequentially at interface of solid substrates and polymer solutions. [5,16,[29][30][31][32][33][34][35][36][37] Given that various polymers bearing complementary interactions can be employed to prepare polymeric complexes, polymeric composite materials based on polymeric complexes can possess various compositions, controllable cross-linking density, and well-tailored mechanical properties. [31,33,35,[37][38][39] During the formation of polymeric complexes, polymers with self-assembly ability can generate welldesigned micro-/nanosized structures, which provide a facile way to further tailor the mechanical properties of the resultant materials. [29] Similar to supramolecular polymers, the reversible noncovalent interaction among polymer chains can also It is challenging to fabricate mechanically super-strong polymer composites with excellent healing capacity because of the significantly limited mobility of polymer chains. The fabrication of mechanically super-strong polymer composites with excellent healing capacity by complexing polyacrylic acid (PAA) with polyvinylpyrrolidone (PVPON) in aqueous solution followed by molding into desired shapes is presented. The coiled PVPON can complex with PAA in water via hydrogen-bonding interactions to produce transparent PAA-PVPON compos...

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3D Fluorescent Hydrogel Origami for Multistage Data Security Protection

Zhang

Jian

et al. 2019

Adv Funct Materials

178

110

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Current fluorescence‐based anti‐counterfeiting strategies primarily encode information onto single 2D planes and underutilize the possibility of encrypting data inside 3D structures to achieve multistage data security. Herein, a fluorescent‐hydrogel‐based 3D anti‐counterfeiting platform is demonstrated, which extends data encryption capability from single 2D planes to complex 3D hydrogel origami geometries. The materials are based on perylene‐tetracarboxylic‐acid‐functionalized gelatin/poly(vinyl alcohol) hydrogels, which simultaneously show Fe3+‐responsive fluorescence quenching, borax‐triggered shape memory, and self‐healing properties. By employing an origami technique, various complex 3D hydrogel geometries are facilely fabricated. On the basis of these results, a 3D anti‐counterfeiting platform is demonstrated, in which the data printed by using Fe3+ as the ink are safely protected inside complex 3D hydrogel origami structures. In this way, the encrypted data cannot be read until after specially predesigned procedures (both the shape recovery and UV light illumination actions), indicating higher‐level information security than the traditional 2D counterparts. This facile and general strategy opens up the possibility of utilizing 3D fluorescent hydrogel origami for data information encryption and protection.

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Self‐Healing Proton‐Exchange Membranes Composed of Nafion–Poly(vinyl alcohol) Complexes for Durable Direct Methanol Fuel Cells

Cited by 137 publications

References 55 publications

Bioinspired Artificial Sensory Nerve Based on Nafion Memristor

Bioinspired Artificial Sensory Nerve Based on Nafion Memristor

Healable and Mechanically Super‐Strong Polymeric Composites Derived from Hydrogen‐Bonded Polymeric Complexes

3D Fluorescent Hydrogel Origami for Multistage Data Security Protection

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