Method for preparing proton exchange membranes from modified bacterial cellulose membranes and application thereof

A technology of bacterial cellulose membrane and proton exchange membrane, which is applied in the field of preparation and application of proton exchange membrane, can solve problems such as low proton conductivity, and achieve the effects of simple and easy preparation process, avoiding secondary pollution and low cost.

Active Publication Date: 2012-01-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the proton conductivity of bacterial cellulose membrane is low, and it needs to be modified to improve the proton conductivity.

Method used

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  • Method for preparing proton exchange membranes from modified bacterial cellulose membranes and application thereof
  • Method for preparing proton exchange membranes from modified bacterial cellulose membranes and application thereof
  • Method for preparing proton exchange membranes from modified bacterial cellulose membranes and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Rinse the bacterial cellulose membrane with deionized water several times to remove impurities such as residual medium, and then place it in a 1% by mass sodium hydroxide solution at 90°C for 1 hour in a water bath until the BC wet membrane becomes white and translucent ; Wash several times with deionized water, and boil the membrane in deionized water for 0.5h, then take it out and rinse with deionized water until the surface pH of the bacterial cellulose membrane is neutral, and then place the bacterial cellulose membrane on a flat surface Dry on a glass plate in an oven at 50°C. Take out the bacterial cellulose dry film, cut it into 1×1.5cm film, and save it for future use.

[0027] (2) The excess molar concentration is 8.4mol L -1 Phosphoric acid solution soaked the bacterial cellulose dry film for 72 hours, took out the bacterial cellulose film and blotted the residual phosphoric acid on the surface with absorbent paper, and dried it naturally in the air to pr...

Embodiment 2

[0038] (1) Rinse the bacterial cellulose membrane with deionized water several times to remove impurities such as residual culture medium, and then place it in a 1% by mass potassium hydroxide solution at 80°C for 1 hour until the BC wet membrane becomes white and translucent ; wash several times with deionized water, and boil the membrane in deionized water for 1 hour, then take it out and rinse it with deionized water until the surface pH of the bacterial cellulose membrane is neutral, and then place the bacterial cellulose membrane on a flat surface Let the glass plate dry naturally, take out the dry film of bacterial cellulose, cut it into 1×1.5cm film, and save it for future use.

[0039] (2) The bacterial cellulose dry film was modified by doping with phosphoric acid. The excess molar concentration is 6mol L -1Phosphoric acid solution soaked the bacterial cellulose dry film for 72 hours, took out the bacterial cellulose film and blotted the residual acid on the surface ...

Embodiment 3

[0042] (1) Rinse the bacterial cellulose membrane with deionized water several times to remove impurities such as residual culture medium, and then place it in a 5% by mass sodium carbonate solution for 2 hours in a water bath at 80°C until the BC wet membrane becomes white and translucent; Wash several times with deionized water, and boil the membrane in deionized water for 1 hour, then take it out and rinse with deionized water until the surface pH of the bacterial cellulose membrane is neutral, then place the bacterial cellulose membrane on a flat glass On the board, dry it in an oven at 50°C, and cut it into membranes of different shapes according to the size of the single cell, such as 3×3cm, and save it for future use.

[0043] (2) The bacterial cellulose dry film was modified by doping with phosphoric acid. The excess molar concentration is 8.4mol L -1 Soak the bacterial cellulose dry film in a phosphoric acid solution for 72 hours, take out the bacterial cellulose fil...

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Abstract

The invention relates to a method for preparing proton exchange membranes from modified bacterial cellulose membranes and an application thereof. The method comprises the following steps that: (1) the bacterial cellulose membranes are taken to be flushed, residual culture medium impurities are removed, then, the bacterial cellulose membranes are placed in alkaline solution for water bath treatment for 0.5 to 2h until the bacterial cellulose membranes become white and semitransparent, the bacterial cellulose membranes are then flushed and is boiled for 0.5 to 2h, and the bacterial cellulose membranes are taken out to be flushed until the pH value of the bacterial cellulose membranes is neutral; and (2) the bacterial cellulose membranes with the neutral surface pH value are soaked in superfluous inorganic acid or organic acid, and the proton exchange membranes are obtained through drying. The prepared modified bacterial cellulose proton exchange membranes are used for being assembled into fuel cells. The preparation process is simple, the cost is low, the environment pollution is little, and the cellulose membranes have higher proton conductivity and better thermal stability.

Description

technical field [0001] The invention belongs to the field of preparation and application of proton exchange membranes, in particular to a method for preparing proton exchange membranes by modifying bacterial cellulose membranes and its application in fuel cells. Background technique [0002] A fuel cell is an electrochemical device that continuously converts the chemical energy in the continuously supplied fuel and oxidant into electrical energy. Fuel cell is a new type of environmentally friendly chemical power source, which has the advantages of not being limited by the Carnot cycle, high energy conversion efficiency, low operating noise, high reliability, convenient maintenance, and easy availability of fuel. The preferred clean and efficient power generation technology, the United States even listed fuel cells as the third cutting-edge technology after the genome project and super materials. Among them, the proton exchange membrane fuel cell (Proton Exchange Membrane Fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/14C08L1/02H01M2/16H01M8/02
CPCY02E60/50Y02E60/12
Inventor 洪枫蒋高鹏乔锦丽
Owner DONGHUA UNIV
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