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A kind of high temperature fuel cell proton exchange membrane and preparation method thereof

A high-temperature fuel cell, proton exchange membrane technology, applied in fuel cells, electrolytes, solid electrolytes, etc., can solve the problems of cooling and heat recovery, disparity in proton conductivity, poisoning effect fuel, etc. Stable and chemically stable, high conductivity effect

Active Publication Date: 2021-07-20
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Perfluorosulfonic acid membrane (Nafion) is currently the most successful commercial proton exchange membrane. Although it has excellent battery performance, its proton conduction process strongly depends on the participation of water molecules. Therefore, it can only be used in Within a certain temperature range (used below 80°C)
At this temperature, batteries that use reformed gas as fuel will face the following problems: CO poisoning effect and fuel selection; cooling and heat recovery; water management issues, etc.
In addition, due to the mechanical stability of the substrate, it is possible to use some polymer electrolyte materials with poor flexibility and poor strength during film formation.
However, the proton conductivity of existing inorganic electrolytes has a certain disparity compared with liquid electrolytes, how to rationally utilize and improve the proton conductivity of solid electrolytes is the key

Method used

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  • A kind of high temperature fuel cell proton exchange membrane and preparation method thereof
  • A kind of high temperature fuel cell proton exchange membrane and preparation method thereof
  • A kind of high temperature fuel cell proton exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Cut out a PTFE diaphragm with a size of 10cm*10cm (thickness 20μm, porosity 50%-75%), fix it with a clamp, and configure a mixed solution of 98% concentrated sulfuric acid and 30% hydrogen peroxide at a volume ratio of 7:3 , take an appropriate amount of PTFE membrane immersed in the mixed solution, and perform surface activation at a constant temperature of 80 ° C for 1 hour; rinse the PTFE membrane obtained above with an equal amount of water; Sodium solution (1.0 mol / L), hydrogen peroxide (30%) and distilled water were further passivated for about 1 hour; the passivated film was rinsed with an equal amount of water, dried and set aside.

[0030] Weigh 2g of PBI powder, dissolve it in 98g of N-methylpyrrolidone (NMP), and stir magnetically for 6h, so that the PBI powder is completely dissolved in the NMP, so that the final concentration of PBI in the NMP solution is 2wt%. The dissolved solution is filtered in a funnel, and 30 g of the filtered solution is put into a b...

Embodiment 2

[0034] Cut out a PTFE diaphragm with a size of 10cm*10cm (thickness 20μm, porosity 50%-75%), fix it with a clamp, and configure a mixed solution of 98% concentrated sulfuric acid and 30% hydrogen peroxide at a volume ratio of 7:3 , take an appropriate amount of PTFE membrane immersed in the mixed solution, and perform surface activation at a constant temperature of 80°C for one hour; rinse the PTFE membrane obtained above with an equal amount of water; Sodium oxide solution (1.0 mol / L), hydrogen peroxide (30%) and distilled water were further passivated for about 1 hour; the passivated film was rinsed with an equal amount of water, dried and set aside.

[0035]Weigh 2g of PBI powder, dissolve it in 98g of N-methylpyrrolidone, and stir magnetically for 6h, so that the PBI powder is completely dissolved in NMP, so that the final concentration of PBI in the NMP solution is 4wt%. The dissolved solution is filtered in a funnel, and 30g of the filtered solution is put into a beaker,...

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Abstract

The invention belongs to the technical field of fuel cells, and in particular relates to a high-temperature fuel cell proton exchange membrane and a preparation method thereof. The high-temperature fuel cell proton exchange membrane is a polytetrafluoroethylene diaphragm (PTFE) composite diaphragm filled with polybenzimidazole (PBI) doped with inorganic proton conductors; wherein, the mass ratio of inorganic proton conductors to PBI is 1:1‑3 . The invention has low raw material price, simple preparation process and relatively mild reaction conditions, and the prepared proton exchange membrane still has high proton conductivity under high temperature, low humidity and even anhydrous conditions.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a high-temperature fuel cell proton exchange membrane and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a kind of fuel cell system that uses proton exchange membrane as electrolyte, and proton exchange membrane is the core component of fuel cell, which plays a decisive role in battery performance and life. Perfluorosulfonic acid membrane (Nafion) is currently the most successful commercial proton exchange membrane. Although it has excellent battery performance, its proton conduction process strongly depends on the participation of water molecules. Therefore, it can only be used in Within a certain temperature range (used below 80°C). At this temperature, batteries using reformed gas as fuel will face the following problems: CO poisoning effect and fuel selection; cooling and heat recovery; water managemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/103H01M8/1039H01M8/1069
CPCH01M8/103H01M8/1039H01M8/1069H01M2008/1095H01M2300/0082H01M2300/0091Y02E60/50
Inventor 李晓锦时冉苗纪远
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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