Synthesis of carbon quantum dots in a Nafion matrix: Precursor effect on the ion transport properties

Karpushkin, Evgeny A.; Kharochkina, Ekaterina; Klimenko, Maria M.; Gallyamov, Marat O.; Sergeyev, Vladimir G.

doi:10.1016/j.mencom.2018.05.007

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…Modification of the Nafion membrane with nanostructured fillers is an effective strategy to optimize the pore distribution and surface functional groups. − Especially, carbon dots (CDs) displaying tunable size in the range of several nanometers with abundant hydrophilic groups (−COOH, −OH, etc.) are being explored in many emerging technologies such as photocatalysis, bioimaging, sensors, and biomedicine applications. − The CDs-modified Nafion membranes were demonstrated to enhance the ionic transfer and inhibit the cross-over fuel permeation and therefore improve the performance of flow battery and fuel cells. − However, the strategy of directly improving the purity of H 2 in electrolytic water by modification of the PEM has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Modifying Ionic Membranes with Carbon Dots Enables Direct Production of High-Purity Hydrogen through Water Electrolysis

Wang

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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Traditional electrolysis of water produces hydrogen with a purity of ∼98%. Using ion transport membranes to prevent the migration of oxygen (O 2 ) from the anode to the cathode, the purity of H 2 can be increased to ∼99.8%, but it still cannot fulfill the requirement for use in fuel cells (>99.97%). Here, we report that modifying a commercial ionic membrane (Nafion) with carbon dots (CDs) can further inhibit O 2 permeation across the membrane, while effectively improving its ion transportability. The key to achieve these effects is the rational design and proper loading of the CDs, which narrows the pore size of the membrane from ∼4 nm to <2 nm and alters its surface functionality. Using the CDs-modified Nafion membrane in an H-type electrolysis cell, we demonstrate that H 2 with a purity of up to 99.98%, which meets the standards of hydrogen fuel cells, can be directly produced without any additional purification process. Our study provides a new route for the low-cost electrolysis of water to produce high-purity hydrogen.

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Section: Introductionmentioning

confidence: 99%

Modifying Ionic Membranes with Carbon Dots Enables Direct Production of High-Purity Hydrogen through Water Electrolysis

Wang

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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“…The development of technologically simple and cost-efficient composite materials with unique properties, which can be applied in various fields of science and technology, is a hot topic in the modern scientific community [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

Curing of Epoxy Resin DER-331 by Hexakis(4-acetamidophenoxy)cyclotriphosphazene and Properties of the Prepared Composition

et al. 2019

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The method of optical wedge revealed that the optimum temperature for compatibility of hexakis(4-acetamidophenoxy)cyclotriphosphazene (ACP) and DER-331 epoxy resin is in the range of 220–260 °C. The interdiffusion time of components at these temperatures is about 30 min. The TGA and differential scanning calorimetry (DSC) methods revealed the curing temperature of 280 °С for this composition. IR spectroscopy confirmed that the reaction between the resin and ACP is completed within 10 min. According to the DSC data, a glass transition temperature of 130 °С was estimated for the cured resin. Combustion test UL-94 demonstrated that the obtained material can be assigned to the fireproof category of V-0. Burning droplets were not formed during the burning. The coke formed during the combustion of samples possessed a dense and porous structure. The shape of pores is closed, while their size is in the range of 0.2–200 µm.

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“…We have recently discovered [15] that the introduction of sodium azide (a well-known preservative inhibiting microbial activity [16] and thus widely used to stabilize aqueous buffered solutions during storage) in the reaction mixture during the preparation of AuNCs under the action of citrate and AMP leads to significant change in their optical properties. The addition of a large excess (about 100-fold with respect to HAuCl 4 ) of NaN 3 has completely suppressed the formation of the fluorescent products, whereas at intermediate concentrations of NaN 3 (up to 20-fold molar excess), the blue-green fluorescence of the produced AuNCs was changed to yellow and weakened.…”

Section: Introductionmentioning

confidence: 99%

Gold Nanoclusters Prepared in the Presence of Adenosine Monophosphate and Citrate: Factorial-Based Synthesis Optimization and Sensing Properties

Karpushkin,

Mesnyankina,

Sergeyev

2023

Analytica

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Gold nanoclusters are peculiar objects promising in view of qualitative and quantitative determination of various species, including heavy metal ions and biological molecules. We have recently discovered that introducing sodium azide in the reaction mixture during gold nanocluster synthesis in the presence of citrate and adenosine monophosphate can tune the product emission from blue to yellow. Taking advantage of the factorial design of the experiment, we have optimized the synthesis conditions to obtain pure blue and yellow emitters and investigate their sensitivity to a series of inorganic salts. The experiments have revealed selective quenching of the nanocluster’s fluorescence in the presence of mercury(II) ions.

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Synthesis of carbon quantum dots in a Nafion matrix: Precursor effect on the ion transport properties

Cited by 6 publications

References 16 publications

Modifying Ionic Membranes with Carbon Dots Enables Direct Production of High-Purity Hydrogen through Water Electrolysis

Modifying Ionic Membranes with Carbon Dots Enables Direct Production of High-Purity Hydrogen through Water Electrolysis

Curing of Epoxy Resin DER-331 by Hexakis(4-acetamidophenoxy)cyclotriphosphazene and Properties of the Prepared Composition

Gold Nanoclusters Prepared in the Presence of Adenosine Monophosphate and Citrate: Factorial-Based Synthesis Optimization and Sensing Properties

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