Thursday, January 28, 2010

Carbon Nanotube Electrodes and Wires for Improved Proton Exchange Membrane Fuel Cells Fabricated by Tsinghua University and Hon Hai Precision Industry Chemists


FIG. 9 is a Scanning Electron Microscope (SEM) image of a drawn carbon nanotube film deposited with platinum for use in an improved fuel cell electrode made by Tsinghua University scientists.


Tsinghua University (Beijing City,CN) and Hon Hai Precision Industry Co., Ltd. (Tu-Cheng City, TW) membrane electrode assembly includes a proton exchange membrane and at least one electrode in U.S. Patent Application 20100021797.

Due to the carbon nanotube structure having good conductivity, the electrons needed or generated in the reactions are quickly conducted by the carbon nanotube structure. This presents a more efficient membrane electrode assembly, say inventors Li-Na Zhang, Kai-Li Jiang and Shou-Shan Fan.

The at least one electrode includes a carbon nanotube composite structure. The carbon nanotube composite structure includes a carbon nanotube structure and a catalyst material. The carbon nanotube structure includes a plurality of carbon nanotubes and the catalyst material is dispersed on the carbon nanotubes. A fuel cell using the membrane electrode assembly has also been developed. 

The diffusion layer includes a carbon nanotube structure. The carbon nanotube structure includes a plurality of micropores uniformly distributed therein. As such, on one side of MEA, the hydrogen can be effectively and uniformly diffused in the carbon nanotube structure. The hydrogen fully contacts with metal particles in the second electrode. Thus, the catalytic reaction activity of the metal particles with the hydrogen is enhanced.

FIG. 2 is a Scanning Electron Microscope (SEM) image of a drawn carbon nanotube film. 



On the other side of the MEA, the oxidant gases are also uniformly diffused in the carbon nanotube structure, thereby fully contacting with the metal particles in the first electrode. Thus, the catalytic reaction activity of the metal particles with the hydrogen ions and electrons is enhanced.

FIG. 4 is a Scanning Electron Microscope (SEM) image of an untwisted carbon nanotube wire.



FIG. 5 is a Scanning Electron Microscope (SEM) image of a twisted carbon nanotube wire. The twisted carbon nanotube wire can be formed by twisting a drawn carbon nanotube film by using a mechanical force to turn two ends of the carbon nanotube film in opposite directions. Referring to FIG. 5, the twisted carbon nanotube wire includes a plurality of carbon nanotubes oriented around an axial direction of the twisted carbon nanotube wire. The carbon nanotubes are aligned around the axis of the carbon nanotube twisted wire like a helix.


FIG. 6 is a Scanning Electron Microscope (SEM) image of a pressed carbon nanotube film with the carbon nanotubes.



FIG. 7 is a Scanning Electron Microscope (SEM) image of a pressed carbon nanotube film with the carbon nanotubes arranged along two or more directions.


FIG. 8 is a Scanning Electron Microscope (SEM) image of a flocculent carbon nanotube film.


1 comment:

  1. Nice post. Thanks for sharing about carbon nanoparticles. Nanoprticles are very important thing in today's world.

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