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Membrane electrode of direct carbinol full cell fed by liquid state and its prepn. tech

A methanol fuel cell, membrane electrode technology, applied in battery electrodes, battery pack components, circuits, etc., can solve the problems of reduced catalytic activity, catalyst poisoning, high price, etc., to improve fuel utilization, improve structure, and improve performance. Effect

Inactive Publication Date: 2005-01-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time Nafion membrane is expensive (800-1000$ / m 2 ), has a high methanol permeability, methanol passes through the proton exchange membrane from the anode to the cathode, and electrochemically reacts at the cathode, resulting in a decrease in the cathode potential and a waste of fuel
Furthermore, because the transfer rate of methanol in the catalyst layer is slower than that of hydrogen and the catalyst is likely to cause catalyst poisoning when catalyzing methanol, the catalytic activity of the reaction is reduced, which restricts the practical application of direct methanol fuel cells.

Method used

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  • Membrane electrode of direct carbinol full cell fed by liquid state and its prepn. tech
  • Membrane electrode of direct carbinol full cell fed by liquid state and its prepn. tech
  • Membrane electrode of direct carbinol full cell fed by liquid state and its prepn. tech

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Embodiment 1

[0016] 1. Membrane preparation and pretreatment. The polyether ether ketone powder is directly sulfonated with sulfuric acid with a concentration of 98%, to obtain a sulfonated polyether ether ketone (SPEEK) solid with a sulfonation degree of 38%, which is dissolved in DMF and placed in an oven on a clean glass plate at 60°C After drying for 8h, a SPEEK film was obtained. The prepared membrane was soaked in 1mol / L sulfuric acid solution for 24 hours, and the prepared proton exchange membrane was immersed in deionized water for use.

[0017] 2. Use Pt / C and Pt-Ru / C from Johnson Matthey, UK as the anode and cathode catalysts of the direct methanol fuel cell, respectively, and the Pt content is 20%. Take 50mg of anode and cathode catalyst powders respectively, add dispersant and 60mg of 5wt% Nafion emulsion as a binder, ultrasonically disperse into a paste, and then add 3.5mg of PTFE emulsion to the anode catalyst and ultrasonically disperse evenly. Part of the dispersant was v...

Embodiment 2

[0021] 1. Membrane preparation and pretreatment. The polyether ether ketone powder is directly sulfonated with sulfuric acid with a concentration of 98%, to obtain a sulfonated polyether ether ketone (SPEEK) solid with a sulfonation degree of 38%, which is dissolved in DMF and placed in an oven on a clean glass plate at 60°C After drying for 8h, a SPEEK film was obtained. The prepared membrane was soaked in 1mol / L sulfuric acid solution for 24 hours, and the prepared proton exchange membrane was immersed in deionized water for use.

[0022] 2. Use Pt / C and Pt-Ru / C from Johnson Matthey, UK as the anode and cathode catalysts of the direct methanol fuel cell, respectively, and the Pt content is 20%. Take 50mg of anode and cathode catalyst powders, add dispersant and 5wt% Nafion emulsion 60mg as binder, ultrasonically disperse into a paste, then add 3.5mg of PTFE emulsion and 12.5mg of NaHCO to the anode catalyst 3 As a pore forming agent, only 12.5mgNaHCO is added to the cathod...

Embodiment 3

[0026] 1. Membrane preparation and pretreatment. The polyether ether ketone powder is directly sulfonated with sulfuric acid with a concentration of 98%, to obtain a sulfonated polyether ether ketone (SPEEK) solid with a sulfonation degree of 38%, which is dissolved in DMF and placed in an oven on a clean glass plate at 60°C After drying for 8h, a SPEEK film was obtained. The prepared membrane was soaked in 1mol / L sulfuric acid solution for 24 hours, and the prepared proton exchange membrane was immersed in deionized water for use.

[0027] 2. Use Pt / C and Pt-Ru / C from Johnson Matthey, UK as the anode and cathode catalysts of the direct methanol fuel cell, respectively, and the Pt content is 20%. Take 80mg of anode and cathode catalyst powders, add dispersant and 5wt% Nafion emulsion 96mg as binder, ultrasonically disperse into a paste, then add 5.6mg of PTFE emulsion and 20mgNaHCO to the anode catalyst 3 As a pore forming agent, only 20mgNaHCO is added to the cathode 3 As ...

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Abstract

Proton exchange membrane is adopted in membrane electrode. There is catalyst supported by carbon paper treated by Teflon latex on two sides of the membrane. Carbon carried platinum-ruthenium catalyst is as anode, and Carbon carried platinum catalyst is as cathode. The preparing procedure includes: preparation of membrane and pretreatment, preparation of catalyst and paste, preparation of anode and cathode, and hot pressing procedure. Advantages are: new type proton exchange membrane of blocking alcohol raises fuel utilization and voltage discharged at low current of DMFC, improves transferring fuel, oxidant, CO2 and water inside membrane electrode.

Description

technical field [0001] The invention relates to a liquid-feed direct methanol fuel cell membrane electrode and a preparation process thereof, belonging to the direct methanol fuel cell membrane electrode material and manufacturing technology. Background technique [0002] Membrane electrodes are the heart of direct methanol fuel cells. At present, the composition, structure and preparation process of liquid-feed direct methanol fuel cell (DMFC) membrane electrodes basically follow those of hydrogen-oxygen (air) fuel cell membrane electrodes. The existing direct methanol fuel cell membrane electrode is composed of a proton exchange membrane, a catalyst layer hot-pressed on both sides of the membrane and carbon paper for supporting and dispersing raw materials. Among them, the anode uses carbon-supported platinum-ruthenium as a catalyst, and the cathode catalyst is carbon-supported platinum. The preparation process of the membrane electrode includes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22H01M2/14H01M4/86H01M4/88
CPCY02E60/50
Inventor 王宇新许莉邓会宁
Owner TIANJIN UNIV
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