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Free-standing sandwich structure composite proton conducting film and preparation method thereof

A proton-conducting membrane and proton-conducting technology, applied in structural parts, solid electrolyte fuel cells, circuits, etc., can solve the problems of increasing the complexity of membrane electrode preparation and application limitations

Inactive Publication Date: 2010-07-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of film cannot be self-supporting. In order to realize the function of the proton membrane separating fuel and oxidant in fuel cells, the proton-conducting membrane must be supported on a specific porous substrate, which increases the complexity of membrane electrode preparation and limits its application.

Method used

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  • Free-standing sandwich structure composite proton conducting film and preparation method thereof
  • Free-standing sandwich structure composite proton conducting film and preparation method thereof
  • Free-standing sandwich structure composite proton conducting film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1: Prepare a sacrificial layer. Poly(p-styrenesulfonic acid) (PSS, Aldrich) was dissolved in deionized water to prepare a 5 wt% aqueous solution of PSS. Place the substrate on a spin coater at 3000 rpm for 1 minute to spin coat the PSS sacrificial layer.

[0041] Step 2: Prepare the organic layer. A polymer of formaldehyde, (chloromethyl)oxirane and 2-methylphenol (PCGF, Aldrich) was mixed with polyethyleneimine (PEI, Aldrich) in chloroform at a mass ratio of 1:1 to prepare 1 wt% solution. Spin-coat the PEI / PCGF organic layer on the substrate obtained in step 1 at 3000 rpm for 1 minute.

[0042] Step 3: Prepare the inorganic layer. Ethyl orthosilicate: n-propanol: water: hydrochloric acid: C 16 h 33 (OC 2 h 4 ) 10 OH (CEO, Aldrich) = 1: 11.4: 5: 0.004: 0.1 ratio preparation (CEO) SiO 2 Sol. Spin coat surfactant-containing SiO at 3000 rpm for 1 min 2 layer on the substrate obtained in step 2.

[0043] Step 4: Prepare the organic layer. Coating material...

Embodiment 2

[0046] Step 1: Prepare a sacrificial layer. Dissolve PSS in deionized water to prepare a 20 wt% PSS aqueous solution. Place the substrate on a spin coater at 10,000 rpm for 1 minute to spin coat the PSS sacrificial layer.

[0047] Step 2: Prepare the organic layer. PCGF and PEI were mixed in chloroform at a mass ratio of 1:1 to prepare a 50 wt% solution. Start the spin coater, and coat the PEI / PCGF organic layer on the substrate obtained in step 1.

[0048] Step 3: Prepare the inorganic layer. First, tetraethyl orthosilicate, deionized water, and hydrochloric acid were mixed according to the ratio of 1:4:4×10 -3 The molar ratio was vigorously stirred at room temperature for 30 minutes. Then according to 5%P 2 o 5 -95% SiO2 2 The molar percentage of phosphoric acid was slowly added to the solution and stirred for 20 minutes. The prepared sol was dropped on the substrate in step 2, held at 1000 rpm for 1 minute, spin-coated to obtain a phosphosilicate layer.

[0049] S...

Embodiment 3

[0053] Step 1: Prepare a sacrificial layer. Dissolve PSS in deionized water to prepare a 0.1 wt% PSS aqueous solution. Put the substrate on the spin coater, keep it at 100 rpm for 5 minutes, start the spin coater, and coat the PSS sacrificial layer.

[0054] Step 2: Prepare the organic layer. PCGF and PEI were mixed in chloroform at a mass ratio of 1:1 to prepare a 0.1 wt% solution. Start the spin coater at 1000 rpm, hold for 1 minute, and spin coat the PEI / PCGF organic layer on the substrate obtained in step 1.

[0055] Step 3: Prepare the inorganic layer. zirconium n-butoxide: acetylacetone: water: propanol: surfactant F127 (BASF Corporation) = 1:5:5:20:0.01 ratio to prepare the sol. Dilute zirconium n-butoxide in butanol in proportion, add acetylacetone and water, stir at room temperature for 1h; surfactant F127 was dissolved in 5 times the volume of butanol and stirred at room temperature for 1 h; the above two solutions were mixed and stirred continuously at room ...

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Abstract

The invention relates to a free-standing sandwich structure composite proton conducting film and a preparation method thereof in the technical field of a fuel cell. A sandwich structure is formed by an upper organic proton conducting film layer, a lower organic proton conducting film layer and a middle inorganic proton conducting film layer, wherein, the inorganic proton conducting film layer is metallic oxide or phosphorus-containing metallic oxide with proton conducting capacity, and the organic proton conducting film layer is polymer with the proton conducting capacity. The problems of no flexibility of the inorganic proton conducting film layer and high methanol permeability of the organic proton conducting film layer are overcome, and the free-standing sandwich structure composite proton conducting film with proton conducting capacity and very low methanol permeability is obtained, so as to solve technical problems in the prior art.

Description

technical field [0001] The invention relates to a material in the technical field of fuel cells and a preparation method thereof, in particular to a self-supporting sandwich structure composite proton conductive membrane and a preparation method thereof. Background technique [0002] Polymer electrolyte membranes (such as Membranes) have high proton conductivity and good chemical stability, and are widely used in low-temperature fuel cells (PEFCs and DMFCs). However, polymeric proton-conducting membranes are prone to deformation caused by water adsorption and desorption, allowing fuel (especially methanol) to pass through the electrolyte membrane, causing chemical short circuits, polluting the electrodes, and resulting in a significant reduction in the output power of the fuel cell. Compared with the polymer electrolyte membrane, the preparation process of the inorganic proton conductive membrane is simple, the cost is low, and there is no deformation caused by water adsor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/12H01M8/02H01M2/16H01M8/1213
CPCY02E60/12Y02E60/522Y02E60/523Y02E60/525Y02E60/50
Inventor 李海滨伊曼
Owner SHANGHAI JIAO TONG UNIV
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