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Composite high-temperature proton exchange membrane as well as preparation and application thereof

A proton exchange membrane and composite membrane technology, applied in the field of high temperature fuel cell composite proton exchange membrane and its preparation, can solve the problems of poor mechanical properties, loss of phosphoric acid, etc., and achieve the effects of excellent comprehensive performance, good dispersibility and good mechanical properties

Inactive Publication Date: 2018-06-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the deficiencies in the prior art, and aims to solve the problems of poor mechanical properties and loss of phosphoric acid that currently exist in phosphoric acid-doped PBI polymer electrolyte membranes, and to prepare adsorbed H 3 PO 4 PBI-SiO 2 Composite high-temperature proton exchange membrane, to develop a high-temperature proton exchange membrane with good mechanical properties and high proton conductivity. In order to achieve the above purpose, the present invention firstly prepares an acid-doped ordered mesoporous SiO 2 , using the blending method to blend it with PBI in a certain proportion and obtain PBI-SiO 2 Composite membrane, finally impregnated in a certain concentration of phosphoric acid to obtain a composite high temperature proton exchange membrane

Method used

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  • Composite high-temperature proton exchange membrane as well as preparation and application thereof
  • Composite high-temperature proton exchange membrane as well as preparation and application thereof
  • Composite high-temperature proton exchange membrane as well as preparation and application thereof

Examples

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Effect test

Embodiment 1

[0029] Take 20g of poly(2,2'-(m-phenyl)-5,5'-bibendazole) (mPBI) and add 180g of N,N-dimethylacetamide, stir at room temperature for 24h to form a solid content 10 wt% mPBI solution. Weigh 30g of mPBI solution (10wt% solid content), pour the solution onto a glass plate, cast it on a glass plate and dry it thoroughly in an oven at 80°C, continue heating at 150°C for 5 hours, and finally remove it from the glass plate to obtain a PBI film.

[0030] Take a 4*4cm PBI membrane and soak it in 85wt% phosphoric acid solution, soak it at 80°C for 24 hours, remove excess phosphoric acid on the surface with filter paper, and obtain undoped acid-modified ordered mesoporous SiO 2 Phosphoric acid doped composite film (PA / PBI) quality, the phosphoric acid doping level is 10.0.

Embodiment 2

[0032] (1) Add 15ml of 85wt% phosphoric acid, 50ml of deionized water and 3.0MCM-48 into the one-mouth bottle successively, put it in a decompression device, and let it stand at -0.1MPa for 0.5 hours, then install a condensation reflux device on the one-mouth bottle, 80°C, constant temperature under normal pressure, react for 24h, use Buchner funnel to separate the prepared solid powder from the solvent, and wash the solid powder repeatedly with ethanol, collect and dry in a vacuum oven at 120°C for 12h to prepare acid-modified ordered Mesoporous SiO 2 , that is, phosphorylated functionalized MCM-48 (PA-MCM).

[0033] Weigh 28.5g of mPBI solution (10wt% solid content), add 0.15g PA-MCM to it, pour the solution on a glass plate, cast it and dry it thoroughly in an oven at 80°C, continue heating at 150°C for 5h, and finally remove it from the glass Take off the plate to obtain PBI-SiO with a mass fraction of 5% in the composite film of phosphoric acid modified MCM-48 2 Composi...

Embodiment 3

[0036] Adopt and embodiment 2 to prepare PA / PBI-5-PASiO 2 The same method was used to prepare phosphoric acid modified MCM-48 in PBI-SiO 2 Phosphoric acid doped high temperature proton exchange membrane (PA / PBI-20-PASiO 2 ), the difference is that the quality of PA-MCM is increased to 0.6g.

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Abstract

The invention provides a composite high-temperature proton exchange membrane as well as preparation and application thereof. The composite high-temperature proton exchange membrane is an H3PO4 adsorbed PBI-SiO2 composite membrane, wherein SiO2 is acid modified ordered mesoporous SiO2, the mass content of SiO2 in the composite membrane is 0.1%-30%, and the mass ratio of acid to ordered mesoporous SiO2 is 0.001:1-0.2:1; the mass content of H3PO4 in the PBI-SiO2 composite high-temperature proton exchange membrane after H3PO4 adsorption is 70%-98%. Compared with the prior art, acid modified ordered mesoporous SiO2 contains a large number of hydrogen bonds, can form stronger intermolecular force with PBI, and has better dispersibility in hybrid membranes; acid modified ordered mesoporous SiO2 has ordered proton transport channels, and proton conductivity under the low humidity condition is improved; the prepared composite membrane has relatively high proton conductivity and good mechanicalproperties, and is the high-temperature proton exchange membrane with excellent comprehensive properties.

Description

technical field [0001] The invention relates to a high-temperature fuel cell composite proton exchange membrane and a preparation method thereof, in particular to a composite proton exchange membrane adsorbed with H 3 PO 4 PBI-SiO 2 Composite high temperature proton exchange membrane. Background technique [0002] A fuel cell is an electrochemical conversion device that converts chemical energy into electrical energy, and is one of the most competitive power generation technologies in the 21st century. Among many fuel cell systems, high-temperature proton exchange membrane fuel cells (PEMFCs) have become a hotspot in the research and development of fuel cells in the world because of their (1) strong CO resistance capability and (2) simple system. [0003] Due to its high glass transition temperature, polybenzimidazole (PBI) is relatively mature in the field of high-temperature proton exchange membrane fuel cells. The conductivity of the phosphoric acid-doped polybenzimid...

Claims

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Application Information

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IPC IPC(8): H01M8/1051H01M8/1048H01M8/1069
CPCH01M8/1048H01M8/1051H01M8/1069H01M2008/1095Y02E60/50
Inventor 王素力马文佳孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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