Enhanced proton conductivity of Nafion composite membrane by incorporating phosphoric acid-loaded covalent organic framework

Yin, Yongheng; Li, Zhen; Yang, Xin; Cao, Li; Wang, Chongbin; Zhang, Bei; Wu, Hong; Jiang, Zhongyi

doi:10.1016/j.jpowsour.2016.09.135

Cited by 110 publications

(83 citation statements)

References 49 publications

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“…On the other hand, it should also be noted that the best conductivity values have been obtained blending crystalline porous frameworks (MOFs or COFs) with polymeric matrixes to yield mixed matrix membranes. 34 In this regard, it has recently been shown that a COFbased mixed matrix membrane, obtained by impregnation of a COF (H 3 PO 4 @SNW-1) into a Nafion ® matrix, exhibits a proton conductivity of 6.04 ×10 -2 S cm −1 at 51% RH and 353 K. 35 In order to study the reversibility of the RT-COF-1Ac and LiCl@RT-COF-1 films versus moisture, we have carried out wetting-dewetting cycles. The reproducibility and consistency of the results was ensured using three different pellets for each material.…”

Section: Ionic Conductivity the Rt-cof-1ac Rt-cof-1acbmentioning

confidence: 99%

Ionic Conductivity and Potential Application for Fuel Cell of a Modified Imine-Based Covalent Organic Framework

Montoro¹,

Rodríguez‐San‐Miguel²,

Polo³

et al. 2017

J. Am. Chem. Soc.

213

145

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We present the novel potential application of imine-based covalent organic frameworks (COFs), formed by the direct Schiff reaction between 1,3,5-tris(4-aminophenyl)benzene and 1,3,5-benzenetricarbaldehyde building blocks in m-cresol or acetic acid, named RT-COF-1 or RT-COF-1Ac/RT-COF-1AcB. The post-synthetic treatment of RT-COF-1 with LiCl leads to the formation of LiCl@RT-COF-1. The ionic conductivity of this series of polyimine COFs has been characterized at variable temperature and humidity, using electrochemical impedance spectroscopy. LiCl@RT-COF-1 exhibits a conductivity value of 6.45 × 10 S cm (at 313 K and 100% relative humidity) which is among the highest values so far reported in proton conduction for COFs. The mechanism of conduction has been determined using H andLi solid-state nuclear magnetic resonance spectroscopy. Interestingly, these materials, in the presence of controlled amounts of acetic acid and under pressure, show a remarkable processability that gives rise to quasi-transparent and flexible films showing in-plane structural order as confirmed by X-ray crystallography. Finally, we prove that these films are useful for the construction of proton exchange membrane fuel cells (PEMFC) reaching values up to 12.95 mW cm and 53.1 mA cm for maximum power and current density at 323 K, respectively.

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Section: Ionic Conductivity the Rt-cof-1ac Rt-cof-1acbmentioning

confidence: 99%

Ionic Conductivity and Potential Application for Fuel Cell of a Modified Imine-Based Covalent Organic Framework

Montoro¹,

Rodríguez‐San‐Miguel²,

Polo³

et al. 2017

J. Am. Chem. Soc.

213

145

View full text Add to dashboard Cite

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“…In synthetic systems, proton conduction can be categorised into two different classes; one is proton conduction under humidity using water as proton carrier and another is anhydrous proton conduction free of water. Porous materials have been extensively explored for water-mediated proton conduction as hydrogen-bonding network in water facilitates proton transport, which however can work only at temperatures below 100°C [5][6][7][8][9][10] . In contrast, anhydrous proton conduction is typically based on organic heterocyclic compounds or pure phosphoric acid that are representative of proton carriers other than water, which enable high temperature proton transport but require extraordinary stability of the porous materials and usually finish with a much lower rate.…”

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confidence: 99%

Confining H3PO4 network in covalent organic frameworks enables proton super flow

et al. 2020

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Development of porous materials combining stability and high performance has remained a challenge. This is particularly true for proton-transporting materials essential for applications in sensing, catalysis and energy conversion and storage. Here we report the topology guided synthesis of an imine-bonded (C=N) dually stable covalent organic framework to construct dense yet aligned one-dimensional nanochannels, in which the linkers induce hyperconjugation and inductive effects to stabilize the pore structure and the nitrogen sites on pore walls confine and stabilize the H 3 PO 4 network in the channels via hydrogen-bonding interactions. The resulting materials enable proton super flow to enhance rates by 2-8 orders of magnitude compared to other analogues. Temperature profile and molecular dynamics reveal proton hopping at low activation and reorganization energies with greatly enhanced mobility.

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“…4,5 Therefore, there has being the challenges to design and prepare PEMs with the outstanding properties operating at a range of 100-200 C without humidification. [6][7][8] For the preparation of high temperature proton exchange membranes (HTPEMs), the intensive researches focused on introducing the anhydrous proton conduction carriers into functional polymers, such as polybenzimidazole (PBI) 9 and functional groups modifying PBI, 10,11 poly(2,5-benzimidazole) (abPBI), 12 sulfonated PBI, 13 Nafion, 14 poly(ether sulfone benzotriazole) (PESB), 15 polysulfone (PSF), 16 polyethersulfone (PES), 17 sulfonated poly(ether ether ketone) (SPEEK), 18,19 sulfonated polyimide (SPI), 20 sulfonated poly(imide-benzimidazole) (SPIBI), 21 polyvinylidene fluoride (PVDF), 22 polyvinyl chloride (PVC), 23 and blend polymers. 24,25 Among the reported results, PAdoped PBI-based membranes with inspired results were thus regarded as the most promising candidate as HTPEMs.…”

Section: Introductionmentioning

confidence: 99%

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

et al. 2020

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Freeze-drying (fd) technique is an effective and facile method to accumulate nanofibers for membrane preparation, and it has been frequently reported in the development of energy materials. Kevlar as amide nanofibers (ANFs) could serve as support materials for proton exchange membranes (PEMs) owing to the merits of exceptional stiffness and strength, etc. The aim of this research is to enhance the proton conductivity of phosphoric acid (PA)-doped Kevlar membranes by incorporating polyacrylamide (PAM) and 1-butyl-3-methylimidazolium chloride (bmimCl) with freeze-drying technique. The components of PAM and bmimCl could provide the binding sites to combine PA molecules with the formation of Kevlar/PAM/bmimCl/PA membranes. Furthermore, the prepared membranes with the freeze-drying posttreatment are substantially more effective at enhancing proton conductivity owing to the combination of more PA molecules. Specifically, Kevlar/PAM/bmimCl(fd)/PA membranes showed the anhydrous proton conductivity of 2.64 × 10 −1 S/cm at 180 C and 1.04 × 10 −1 S/cm at 140 C in a 270-hour non-stop test. As regard to the prepared PA-doped Kevlar/CdTe-based membranes, the mechanical strength was far from what was expected. Comparing to the solution casting method, the freeze-drying technique was a feasible strategy to deal with ANFs for exploiting high-temperature PEMs with high performance.

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Enhanced proton conductivity of Nafion composite membrane by incorporating phosphoric acid-loaded covalent organic framework

Cited by 110 publications

References 49 publications

Ionic Conductivity and Potential Application for Fuel Cell of a Modified Imine-Based Covalent Organic Framework

Ionic Conductivity and Potential Application for Fuel Cell of a Modified Imine-Based Covalent Organic Framework

Confining H3PO4 network in covalent organic frameworks enables proton super flow

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

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