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Composite organic siloxane phosphate fuel cell electrolyte membrane and preparation method thereof

A technology of siloxane phosphate ester and electrolyte membrane, which is applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of cumbersome preparation steps, lower quality of proton exchange membranes, impact on proton conductivity, catalytic performance and life of catalysts, etc. To achieve the effect of increasing the migration rate

Inactive Publication Date: 2018-07-20
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film-forming properties of raw materials in this scheme are poor, and the quality of the proton exchange membrane is reduced due to the different swelling coefficients of the components, and the preparation steps are cumbersome and take a long time
[0007] Therefore, a fuel cell proton exchange membrane with a stable structure under high temperature working conditions is proposed to overcome the defects of the traditional fluorosulfonic acid proton exchange membrane with a narrow working temperature range, which affects the proton conductivity and the catalytic performance and life of the catalyst. The study on the expansion of the proton exchange membrane temperature zone has very important practical significance

Method used

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  • Composite organic siloxane phosphate fuel cell electrolyte membrane and preparation method thereof
  • Composite organic siloxane phosphate fuel cell electrolyte membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Evenly mix 70 parts by mass of organosilane tetramethylsilane with a viscosity of 45mPa·s and 30 parts by mass of dimethylchloroethyl phosphate with a viscosity of 25mPa·s, and the control condition is that the stirring speed is greater than 100 rpm , the temperature is 160°C, stirred under a nitrogen protective atmosphere, the nitrogen flow rate is 3mL / min, after the stirring is completed, cool to room temperature, and vacuumize to 800Pa to remove the air bubbles in the viscous mixture to obtain a viscous mixture;

[0032] (2) Add concentrated nitric acid to the viscous mixture, the molar ratio of the concentrated nitric acid to organosilane is 1:112, the mass concentration of the concentrated nitric acid is 90%, conduct condensation reaction, filter and dry after sufficient reaction to obtain condensate jelly-like material;

[0033] (3) The gel-like material is evenly coated on the porous metal oxide magnesia ceramics with a pore size of 300 microns, and the tempera...

Embodiment 2

[0036] (1) Evenly mix 78 parts by mass of dimethyldiethylsilane with a viscosity of 400mPa·s and 22 parts by mass of dimethyl ethyl phosphate with a viscosity of 101mPa·s, and the control condition is that the stirring speed is greater than 100 rpm , the temperature is 130°C, stirred under a nitrogen protective atmosphere, the nitrogen flow rate is 25mL / min, after the stirring is completed, cool to room temperature, vacuumize to 500Pa, remove the air bubbles in the viscous mixture, and obtain a viscous mixture;

[0037] (2) Add concentrated nitric acid to the viscous mixture, the molar ratio of the concentrated nitric acid to organosilane is 1:150, the mass concentration of the concentrated nitric acid is 95%, conduct condensation reaction, filter and dry after sufficient reaction to obtain condensate jelly-like material;

[0038] (3) The gel-like material is evenly coated on the porous metal oxide magnesia ceramics with a pore size of 240 microns, and the temperature of the p...

Embodiment 3

[0041] (1) Evenly mix 93.8 parts by mass of cyclomethicone with a viscosity of 340mPa·s with 6.2 parts by mass of dimethyl hydroxyethyl phosphate with a viscosity of 22mPa·s, the control condition is that the stirring speed is greater than 100 rpm Minutes, the temperature is 120°C, stir under a nitrogen protective atmosphere, the nitrogen flow rate is 34mL / min, after the stirring is completed, cool to room temperature, vacuumize to 750Pa, remove the air bubbles in the viscous mixture, and obtain a viscous mixture;

[0042] (2) Add concentrated nitric acid to the viscous mixture, the molar ratio of the concentrated nitric acid to organosilane is 1:144, the mass concentration of concentrated nitric acid is 95%, conduct condensation reaction, filter and dry after sufficient reaction to obtain condensate jelly-like material;

[0043] (3) The gel-like material is uniformly coated on the surface of porous magnesia ceramics and porous alumina ceramics with a pore size of 145 microns,...

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Abstract

The invention provides a composite organic siloxane phosphate fuel cell electrolyte membrane and a preparation method thereof. The preparation method comprises the steps of uniformly mixing organic siloxane and phosphate, adding concentrated nitric acid for condensation reaction, performing filtering and drying to obtain a gel-shaped material after full reaction, uniformly coating the gel-shaped material on a surface of a porous ceramic membrane, placing the porous ceramic membrane in a vacuum drying furnace after pressing, performing repeated positive-pressure drying under a condition of 120DEG C so that a thin film is compact, and obtaining the ceramic composite siloxane phosphate electrolyte membrane. The defect of influence on proton conductivity and catalytic performance and servicelifetime of a catalyst due to limitation of an organic polymer membrane and relatively narrow working temperature region of a traditional proton exchange membrane fuel cell is overcome, the proton mobility of the prepared electrolyte membrane reaches 10<-2>S / cm order, the prepared electrolyte membrane is good in alcohol blocking rate and relatively high in working temperature, the temperature canbe increased to 240 DEG C, the problem of relatively narrow working temperature region of a traditional proton exchange membrane is solved, and the composite organic siloxane phosphate fuel cell electrolyte membrane can be used as a membrane material widely applied to the field of a fuel cell.

Description

technical field [0001] The invention relates to the field of fuel cell materials, in particular to a composite organosiloxane phosphate fuel cell electrolyte membrane and a preparation method. Background technique [0002] Since traditional fossil fuels are non-renewable and cause serious environmental pollution during use, seeking environmentally friendly renewable energy is a severe task facing mankind in the 21st century. Fuel cell (Fuel cell) is a new type of energy technology, which directly converts the chemical energy of fuel into electrical energy through electrochemical reactions. The fuel used is hydrogen-rich substances such as hydrogen, methanol and hydrocarbons, which has no pollution to the environment and has High energy efficiency and high power density, therefore, fuel cells have broad application prospects. [0003] Proton exchange membrane fuel cell (Proton Exchange Membrane Fuel Cell, PEMFC)) is following alkaline fuel cell (AFC), phosphoric acid fuel ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1016
CPCH01M8/1016Y02E60/50
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD