Various hydrophilic carbon dots doped high temperature proton exchange composite membranes based on polyvinylpyrrolidone and polyethersulfone

Dai, Yu; Wang, Jin; Tao, Peipei; He, Ronghuan

doi:10.1016/j.jcis.2019.06.020

Cited by 56 publications

(28 citation statements)

References 53 publications

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“…The decrease on intermolecular force between components might be the cause. The reported E values were 12.8 MPa for SPEEK/bmim/PA membranes 39 and 16.4 MPa for PA‐doped polyvinylpyrrolidone‐polyethersulfone(PVP‐PES)/carbon dots membranes 24 . Although Kevlar fibers with a high mechanical strength to weight ratio, the reduction on mechanical strength was primarily caused by the depolymerization of Kevlar fibers with high temperature operation in the course of dissolution 56 .…”

Section: Resultsmentioning

confidence: 99%

“…The reported E values were 12.8 MPa for SPEEK/bmim/PA membranes 39 and 16.4 MPa for PAdoped polyvinylpyrrolidone-polyethersulfone(PVP-PES)/ carbon dots membranes. 24 Although Kevlar fibers with a high mechanical strength to weight ratio, the reduction on mechanical strength was primarily caused by the depolymerization of Kevlar fibers with high temperature operation in the course of dissolution. 56 The further researches would be focused on the improvement on stiffness with the introduction of suitable inorganics or seeking a facile and effective strategy to crosslink Kevlar nanofibers for the membrane preparation.…”

Section: Mechanical Propertymentioning

confidence: 99%

“…[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. 26,27 However, the high proton conductivity of PA-doped membranes was achieved with the premise of adequate PA molecules doping.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Mechanical Propertymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The proton exchange membrane fuel cell (PEMFC) has become one of the efficient power generation equipment due to its many advantages. In order to improve the efficiency of PEMFC, Dai et al [68] . prepared CDs by hydrothermal treatment of aqueous solutions of citric acid and ethylenediamine, then incorporated CDs into a copolymerized mixture of polyvinyl pyrrolidone (PVP) and PES to prepare a new proton exchange composite membranes.…”

Section: Application Of Cds@membranesmentioning

confidence: 99%

Advances in Integrating Carbon Dots With Membranes and Their Applications

Yan

et al. 2021

ChemistrySelect

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Carbon dots (CDs) attract interests from researchers in the field of membranes owing to their ultra‐small size, non‐toxic, highly hydrophilic, abundant surface functional groups, stable photoluminescence, fast proton conductivity and excellent light capture capability. The integration of membranes with CDs (CDs@membranes) can enhance the overall performance of membranes significantly and CDs@membranes relies on three approaches: doping, grafting and layer‐by‐layer (LbL) self‐assembly. This paper reviews the research progress of CDs@membranes in the past five years, introduces the mechanism of CDs to improve membrane performance and the methods for preparing CDs@membranes, categorizes them into water treatment, sensing, electrochemistry, light processing and other fields for review, and finally discusses the current challenges and outlook the future direction.

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“…Dai et al [200] developed novel composite membranes consisting of carbon dots of different sizes and with varying levels of hydrophilicity within a matrix of polyvinylpyrrolidone (PVP) and polyethersulfone (PES). AFM and TEM characterization showed that carbon dots with a size of 2-5 nm showed no aggregation and good uniformity.…”

Section: Carbon Nanomaterials Fillersmentioning

confidence: 99%

Composite Polymers Development and Application for Polymer Electrolyte Membrane Technologies—A Review

et al. 2020

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Nafion membranes are still the dominating material used in the polymer electrolyte membrane (PEM) technologies. They are widely used in several applications thanks to their excellent properties: high proton conductivity and high chemical stability in both oxidation and reduction environment. However, they have several technical challenges: reactants permeability, which results in reduced performance, dependence on water content to perform preventing the operation at higher temperatures or low humidity levels, and chemical degradation. This paper reviews novel composite membranes that have been developed for PEM applications, including direct methanol fuel cells (DMFCs), hydrogen PEM fuel cells (PEMFCs), and water electrolysers (PEMWEs), aiming at overcoming the drawbacks of the commercial Nafion membranes. It provides a broad overview of the Nafion-based membranes, with organic and inorganic fillers, and non-fluorinated membranes available in the literature for which various main properties (proton conductivity, crossover, maximum power density, and thermal stability) are reported. The studies on composite membranes demonstrate that they are suitable for PEM applications and can potentially compete with Nafion membranes in terms of performance and lifetime.

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Various hydrophilic carbon dots doped high temperature proton exchange composite membranes based on polyvinylpyrrolidone and polyethersulfone

Cited by 56 publications

References 53 publications

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

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

Advances in Integrating Carbon Dots With Membranes and Their Applications

Composite Polymers Development and Application for Polymer Electrolyte Membrane Technologies—A Review

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