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Bacterial cellulose-Nafion sandwich proton exchange membrane and preparation and application thereof

A bacterial cellulose membrane, bacterial cellulose technology, applied in bacterial cellulose-Nafion sandwich proton exchange membrane and its preparation and application fields, can solve problems such as low proton conductivity, achieve high proton conductivity, good thermal stability, The effect of simple and easy preparation process

Active Publication Date: 2012-09-26
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 its proton conductivity.

Method used

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  • Bacterial cellulose-Nafion sandwich proton exchange membrane and preparation and application thereof
  • Bacterial cellulose-Nafion sandwich proton exchange membrane and preparation and application thereof
  • Bacterial cellulose-Nafion sandwich proton exchange membrane and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Take the bacterial cellulose membrane, wash it with deionized water to remove impurities such as residual culture medium, and then place it in a 1% by mass sodium hydroxide solution at 80°C for 2 hours until the bacterial cellulose membrane turns white It is translucent, then cleaned with deionized water, boiled in deionized water for 1 hour, taken out and rinsed with deionized water until the pH value of the surface of the bacterial cellulose membrane is neutral. At the same time, take the boiled extract to measure its 280nm absorption value, if the absorbance is not lower than 0.05, repeat the steps of boiling and rinsing until the boiled extract has no significant absorption at 280nm;

[0035] (2) Nafion115 membrane was boiled with 3% hydrogen peroxide, deionized water, 1mol / L dilute sulfuric acid and deionized water for 1 hour in sequence, and stored in deionized water.

[0036] (3) Take the treated Nafion115 membrane and cut it into a shape slightly smaller tha...

Embodiment 2

[0046] (1) Take the bacterial cellulose membrane, wash it with deionized water to remove impurities such as residual medium, and then place it in a 1% by mass potassium hydroxide solution for 2 hours at 80°C in a water bath until the bacterial cellulose membrane turns white Translucent, then wash with 0.1% acetic acid aqueous solution and deionized water, boil in deionized water for 1 hour, take it out and rinse with deionized water until the pH value of the surface of the bacterial cellulose membrane is neutral. At the same time, take the boiled extract to measure its 280nm absorption value, if the absorbance is not lower than 0.05, repeat the steps of boiling and rinsing until the boiled extract has no significant absorption at 280nm;

[0047] (2) The Nafion212 membrane was boiled with 3% hydrogen peroxide, deionized water, 1mol / L dilute sulfuric acid and deionized water for 1 hour, and stored in deionized water.

[0048] (3) Take the treated Nafion212 membrane and cut it in...

Embodiment 3

[0058] (1) Take the bacterial cellulose membrane, wash it with deionized water to remove impurities such as residual medium, and then place it in a 5% potassium carbonate solution by mass at 95°C for 1 hour until the bacterial cellulose membrane turns white and semi-white. Transparent, then wash with 0.1% phosphoric acid aqueous solution and deionized water, boil in deionized water for 2 hours, take it out and rinse with deionized water until the surface pH of the bacterial cellulose membrane is neutral. At the same time, take the boiled extract to measure its 280nm absorption value, if the absorbance is not lower than 0.05, repeat the steps of boiling and rinsing until the boiled extract has no significant absorption at 280nm;

[0059] (2) Nafion115 membrane and Nafion212 membrane were boiled with 3% hydrogen peroxide, deionized water, 1mol / L dilute sulfuric acid and deionized water for 1 hour, and stored in deionized water.

[0060] (3) Take the treated Nafion115 membrane or...

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Abstract

The invention relates to a bacterial cellulose-Nafion sandwich proton exchange membrane. The sandwich proton exchange membrane is in a BC-Nafion-BC or Nafion-BC-Nafion structure. The preparation comprises the following steps: soda boiling and washing the bacterial cellulose membrane to acquire a gel-like bacterial cellulose membrane; stacking the gel-like bacterial cellulose membrane, the treated Nafion membrane and the gel-like bacterial cellulose membrane in sequence, or stacking the treated Nafion membrane, the gel-like bacterial cellulose membrane and the treated Nafion membrane in sequence, or drying and soaking the gel-like bacterial cellulose membrane in a Nafion solution, drying the soaked bacterial cellulose membrane; and finally toughening the dried bacterial cellulose membrane. According to the invention, the sandwich proton exchange membrane has lower methanol permeability, higher proton conductivity and high thermal stability, and a good application prospect in a methanol fuel cell. The preparation process is simple and easy, and has little pollution to the environment.

Description

technical field [0001] The invention belongs to the field of proton exchange membranes and their preparation and application, in particular to a bacterial cellulose-Nafion sandwich proton exchange membrane and its preparation and application. Background technique [0002] Direct methanol fuel cell (DMFC) is a new type of fuel cell developed in recent years. It uses methanol aqueous solution as fuel, and methanol is oxidized under the action of the anode catalyst to generate CO 2 , while releasing electrons and protons, which are conducted to the cathode through the external circuit and membrane respectively. O at the cathode 2 Electrochemical reduction consumes electrons transferred from the external circuit and combines with protons to form water. The transfer of electrons from the anode to the cathode through the load realizes the conversion of chemical energy into electrical energy. DMFC has the advantages of rich sources of methanol fuel, low price, high theoretical ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M8/02B32B27/08H01M8/1041H01M8/1081
CPCY02E60/12Y02E60/50
Inventor 洪枫蒋高鹏蒋永明乔锦丽
Owner DONGHUA UNIV
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