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Application of alkaline electrolyte membrane in alkaline direct alcohol fuel cell

A technology of electrolyte membrane and fuel cell, which is applied to fuel cell parts, fuel cells, circuits, etc., can solve the problems of poor alkali and high temperature resistance, achieve good alkali and high temperature resistance, increase peak power density, and good The effect of catalytic activity

Active Publication Date: 2012-08-29
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

However, due to the generally poor alkali resistance and high temperature resistance of quaternary ammonium electrolyte membranes, the operating temperature of alkaline direct alcohol fuel cells using such membranes as electrolyte membranes is usually limited below 60°C, so their peak power density is usually low. at 20mW / cm 2

Method used

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  • Application of alkaline electrolyte membrane in alkaline direct alcohol fuel cell
  • Application of alkaline electrolyte membrane in alkaline direct alcohol fuel cell
  • Application of alkaline electrolyte membrane in alkaline direct alcohol fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] PtRu / C with 45% active component by weight is used as the anode catalyst, carbon paper is used as the support layer of the gas diffusion layer, and the loading capacity of the noble metal is 2.0 mg / cm 2 ; The cathode catalyst is 40% Pt / C by weight of the active component, with carbon paper as the support layer of the gas diffusion layer, and the precious metal loading is 1.0mg / cm 2 ; The Nafion115 membrane soaked in 6M KOH solution at room temperature for 2 days is used as the alkaline electrolyte membrane and sandwiched between two gas diffusion electrodes, and then a metal mesh is placed on the outside of the electrodes as a current collector, and polytetrafluoroethylene is used as a sealing material , and finally clamped with a metal plate with a point-like flow field, and fixed with screws. Mixed solutions of 2M methanol + 2M KOH, 2M ethanol + 2M KOH, 2M isopropanol + 2M KOH, ethylene glycol + 2M KOH were fed into the anode side, and pure oxygen was fed into the cat...

Embodiment 2

[0030] 45% PtRu / C by weight of the active component is used as the anode catalyst, carbon paper is used as the support layer of the gas diffusion layer, and the loading amount of the precious metal is 2.0 mg / cm 2 ; The cathode catalyst is 40% Pt / C by weight of the active component, with carbon paper as the support layer of the gas diffusion layer, and the precious metal loading is 1.0mg / cm 2 ; Nafion112, Nafion1135, Nafion115, Nafion117, and recast Nafion115 membranes immersed in 6M KOH solution at room temperature for 20 days were used as alkaline electrolyte membranes and sandwiched between two gas diffusion electrodes, and then a metal mesh was placed outside the electrodes as a collector. fluid, and use polytetrafluoroethylene as the sealing material, and finally clamp it with a metal plate with a dotted flow field and fix it with screws. A mixed solution of 2M ethanol + 2M KOH is fed into the anode side, and pure oxygen is fed into the cathode side with a pressure of 0.2M...

Embodiment 3

[0032] 45% Pd / C by weight of the active component is used as the anode catalyst, carbon paper is used as the support layer of the gas diffusion layer, and the loading amount of the precious metal is 2.0 mg / cm 2 ; The cathode catalyst is 40% Pt / C by weight of the active component, with carbon paper as the support layer of the gas diffusion layer, and the precious metal loading is 1.0mg / cm 2 ; Use Nafion112 immersed in 6MKOH solution at room temperature for 30 days as the alkaline electrolyte membrane between two gas diffusion electrodes, then place a metal mesh on the outside of the electrodes as a current collector, and use polytetrafluoroethylene as a sealing material, and finally It is clamped with a metal plate with a point flow field and fixed with screws. A mixed solution of 2M ethanol + 2M KOH is fed into the anode side, and pure oxygen is fed into the cathode side with a pressure of 0.2MPa. The operating temperature of the battery is 30°C. Single cell discharge curve ...

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Abstract

The invention discloses application of an alkaline electrolyte membrane in an alkaline direct alcohol fuel cell. The alkaline electrolyte membrane is modified by steeping in alkaline solution at room temperature, can conduct metallic cations and also can be permeated with hydroxyl ions. A preparation method for the alkaline electrolyte membrane comprises that the membrane is steeped in the alkaline solution for a period of time, so that protons combined on sulfonic acid groups in an ion cluster in a skeleton thereof are all replaced by the metallic ions, and the alkaline solution is sufficiently adsorbed in the space of the nanoscale ion cluster. When the alkaline electrolyte membrane prepared by the method is not washed by water and is used for the alkaline direct alcohol fuel cell, the alkaline electrolyte membrane has good mechanical strength and thermal stability, and the peak power density of the alkaline direct alcohol fuel cell is obviously higher than a result of a document report. Moreover, non-Pt catalysts can be adopted, and the cost is obviously reduced than that of an acid direct alcohol fuel cell.

Description

technical field [0001] The invention relates to an alkaline direct alcohol fuel cell, in particular to the application of an alkaline electrolyte membrane in the alkaline direct alcohol fuel cell. Background technique [0002] The traditional direct alcohol fuel cell (DAFC) is a type of proton exchange membrane fuel cell that uses a strongly acidic proton exchange membrane as the electrolyte membrane and organic small molecule alcohols such as methanol and ethanol as fuel. It directly uses liquid alcohol as fuel, which avoids the hydrogen storage problem that currently plagues hydrogen-oxygen fuel cells. At the same time, it has outstanding advantages such as small size, light weight, and high efficiency. Electrode process kinetics and fuel permeation are still the bottleneck factors restricting the further development of DAFC technology. One possible solution is to change the internal environment of the battery from acidic to alkaline, a so-called alkaline direct alcohol f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M8/0297
CPCY02E60/50
Inventor 孙公权侯宏英王素力金巍柳鹤杨少华辛勤
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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