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Proton conducting inorganic material, polymer nano-composite membrane including the same, and fuel cell adopting the polymer nano-composite membrane
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A technology of inorganic materials and proton conduction, applied in the direction of conductive materials, fuel cells, conductive materials, etc., can solve the problems of reducing the permeability of methanol and reducing the ion conductivity of polymer membranes, etc.
Inactive Publication Date: 2006-12-20
SAMSUNG SDI CO LTD
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However, these methods are adversely affected by the aggregation of inorganic nanoparticles, although the permeability of methanol is significantly reduced by simply mixing the inorganic nanoparticles with the polymer of the solid polymer membrane, but the ionic conductivity of the polymer membrane also significantly reduced
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[0049] The preparation method of proton conductive inorganic material is shown in Figure 1B , which illustrates an embodiment using montmorillonite clay as a proton-conducting inorganic material with nanolayer spacing.
[0050] exist Figure 1B In this method, in order to firstly hydrophilize montmorillonite, which is an inorganic material having nanoscale interlayer spacing, the montmorillonite is dispersed in an acidic solution to hydrophilically treat the surface of montmorillonite.
[0051] Treatment of montmorillonite with acid solution is to use protons (H + ) to replace such as Na + 、K + , Mg + Inorganic cations that exist between the layers of montmorillonite. Acid solutions usable for this purpose may be sulfuric acid, hydrochloric acid, nitric acid and the like.
[0052] The amount of acid solution used in the treatment can be 1000-2000 parts by weight based on 100 parts by weight of montmorillonite, and the treatment of montmorillonite can be carried out at 9...
Embodiment 1
[0105] Embodiment 1: the addition of 1,3-PS
[0106] First, the process of imparting proton conductivity to montmorillonite, an inorganic material having a nano-sized layer spacing, is performed as follows.
[0107] Add 20 g of montmorillonite to 500 mL of 1N sulfuric acid solution, and react at 60° C. for 4 hours. After the reaction, the reaction product was fully washed with water to obtain pretreated montmorillonite.
[0108] 1300 mmol of toluene was placed in a 500-mL round bottom flask, and the flask was purged with nitrogen (N 2 ) purification. Next, 60 mmol (6.12 g) of pretreated montmorillonite was added to the flask under stirring to obtain a pretreated montmorillonite reaction mixture.
[0109] Then, 30 mmol (3.66 g) of 1,3-propane sultone were added to the pretreated montmorillonite reaction mixture. The resultant was mixed at 110°C for 24 hours, then cooled, filtered, washed with toluene, and dried at room temperature to obtain a proton conductive inorganic mat...
Embodiment 2
[0110] Embodiment 2: 1, the addition of 4-BS
[0111] A proton-conducting inorganic material with a layered structure was prepared in the same manner as in Example 1, except that 30 mmol (4.08 g) of 1,4-butanesulfonic acid was added to the pretreated montmorillonite reaction mixture ester instead of 30 mmol of 1,3-propane sultone.
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Abstract
A proton conducting inorganic material having a layered structure in which a sulfonic acid group-containing moiety having proton conductivity is introduced in between the layers of an inorganic material having a nano-sized interlayer distance such that the sulfonic acid group-containing moiety is directly bound to the inorganic material via an ether bond. A polymer nano-composite membrane including the product of a reaction between the inorganic material having the sulfonic acid-containing moiety with a proton conducting polymer, and a fuel cell adopting the same, wherein the polymer nano-composite membrane has a structure in which a proton conducting polymer is intercalated between the layers of the proton conducting inorganic material having a layered structure, or a structure in which the product of exfoliating the proton conducting inorganic material having a layered structure is dispersed in a proton conducting polymer. The polymer nano-composite membrane can have a controllable degree of swelling in a methanol solution, and the transmittance of the polymer nano-composite membrane can be reduced.
Description
technical field [0001] The present invention relates to proton-conducting inorganic materials, polymer nanomaterial composite membranes comprising it, and fuel cells using the composite membranes, more particularly, the present invention relates to polymeric materials with reduced permeability to water and methanol and improved thermal stability A composite film of a material nanomaterial, and a fuel cell in which energy density and fuel efficiency are improved by using the composite film of a polymer nanomaterial. Background technique [0002] Direct methanol fuel cell (DMFC) using liquid methanol as fuel is considered to be a future clean energy that can replace fossil energy. Since DMFCs can work at room temperature and can be made into a well-sealed small size, they can be used in a wide range of applications, such as pollution-free automobiles, household power generation systems, mobile communication systems, medical instruments, weapons, space e...
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