Associate Professor of Tokai University, CEATEC Pavilion in industry-university exchanges Electrodes for fuel cells conductive CNT / PTFE composite membrane technology introduced


Electrical and Electronic Engineering, Faculty of Engineering of Tokai University associate professor Yoshiyuki 2008, September 30 – October 4, in the Makuhari Messe (Chiba City) was held in a comprehensive cutting-edge IT and electronics exhibition “CEATEC JAPAN” (Combined Exhibition of Advanced Technologies) in the Pavilion’s industry-university exchanges, electrodes for fuel cell technology as “conductive CNT / PTFE-coated metal composite membrane separator to the development of” Introduction to the exhibition.

Associate Professor polymer electrolyte fuel cell electrode (separator), a carbon nanotube (CNT) and fluorine resin (PTFE) complex consists of a conductive coating film by the electrode surface to prevent corrosion of the fuel Improve the efficiency of the batteries can power. In addition, the membrane electrode coated with a direct-type fuel cell (DMFC) that can also be applied.

Polymer electrolyte fuel cell, a membrane electrode complex (MEA) across the hydrogen and oxygen to generate electricity by chemical reaction. Voltage, MEA between the two sides of the carbon electrodes arises. The new electrode (separator), and the extraction of electricity, hydrogen or oxygen supply on the part of the MEA.

Performance verification, the stainless steel electrode “conductive CNT / PTFE composite film,” If you do not, and if there are comparisons with.

Stainless steel electrode (left),
conductive CNT / PTFE composite membrane electrode coated with stainless steel
Source:Associate Professor of Tokai University

Stainless steel electrode and

Conductive CNT / PTFE-coated composite membranes
Fabricated using electrodes
Fuel cells obtained from the current – voltage,

Current – Output power characteristics.
Source:Associate Professor of Tokai University

Open circuit voltage of the fuel cell, “both of 0.8V and a film seen by RARETAKATTA change,” he said.

On the other hand, fuel cells and increase the output from the current, both of which have reduced output voltage, composite electrode coated with a film that can suppress the decrease, the membranes that gave the maximum output of fuel cells, 2.7W (The film is not, 1.7W), and the effect has been confirmed. The “conductive CNT / PTFE composite membrane,” the MEA and fuel cell electrode inside the electrical contact between the resistance and a decrease in the fuel cell’s internal resistance was reduced according to the analysis.

Typically, this electrode (separator) materials, metals such as stainless steel is used. When the fuel cell power generation, in the vicinity of the electrode, causing the water, and fuel cells from the inside to be acidic, metal corrosion by the MEA and the higher the contact resistance is a problem. The CNT and the electrode coated with PTFE composite material by way prevented corrosion has devised.

“Conductive CNT / PTFE composite membrane”, respectively, in water distributed in advance and how to disperse a mixture of liquid has been fabricated. CNT is that a strong cohesive, CNT dispersion solution for the distribution of cellulose is the addition of auxiliaries. PTFE and mixing ratio of CNT, CNT concentration (weight percent) and more than 10 percent, to improve conductivity and also make sure that the (PTFE, the extremely low conductivity).

CNT and a mixture of PTFE membrane conductivity.
CNT by changing the concentration of the mixture film was fabricated.

Source:Associate Professor of Tokai University

The coating on the glass substrate, the film fired at temperatures of 350 centigrade, high mechanical strength, acid and sulfuric acid corrosion, but not in the mood to see. In addition, the contact angle of water and 110 degrees, and is hydrophobic.

This time, “conductive CNT / PTFE composite film” made of stainless steel electrode (the effective area of 40mmx40mm, thickness of 1mm. Pore diameter of 3mm to 23 locations opening in the structure) coating on the surface of the fuel cell has been created (Hole, the supply of hydrogen and oxygen to the MEA).

* MEA: complex membrane electrode
Electrolyte fuel cell membrane electrode and, in general, as a joint production of the complex. That is, each of the three-dimensional structure respond by interfacial reaction to a change in velocity, the individual can not be manufactured. Such a complex, in general MEA (Membrane and ElectrodeAssembly) call. MEA, the polymer electrolyte fuel cell membrane electrode used to call complex parts, NAFION (electrolyte) membrane supported on both sides of the platinum catalyst thermocompression carbon fiber structure of the electrodes.

(Bureau of Industry-Academia Collaboration =
Tatsuki Shigeru Sakai Hisashi Producer)

Posted under Fuel Cells

This post was written by admin on October 16, 2008


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