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Nanostructured Carbon on Carbon :Nano-Coatings
Carbon nanotube coatings for the performance enhancement of carbon fibre reinforcements, fuel cell electrode and gas diffusion layer materials. Initial trial results suggest that the high surface area and high strength of the adhered carbon nanotubes allows for improved load transfer to the surrounding matrix in carbon composite materials. The addition of carbon nanotubes to electrode materials creates an interface with both high surface area and high conductivity. For enzyme based electrochemical systems this affords the possibility of an optimal bio-scaffold. In DMFC and Hydrogen fuel cells the enhanced materials show improved current collection characteristics, mass transport and wetting resistance.
Figure 1: Carbon nanotube coating on a PAN derived gas diffusion layer.
Carbon nanotube coatings are currently available for several types of carbon support. e.g. Polyacrylonitrile (PAN) derived carbon fibre or Activated carbon cloth. For gas diffusion layer applications the material can be rendered hydrophobic, to prevent flooding of the cell, with little or no loss of conductivity. Platinisation is also available. Further bio-compatible coatings are also available on request.
Figure 2: Carbon nanotube coated and uncoated PAN derived gas diffusion layers.
Carbon nanotube coatings can be applied to large carbon substrates (flat sheets up to 0.9m x 0.9m, flexible sheets can be larger). Current capacity for carbon nanotube coatings around 10,000sqm/month. Minimum order 1sqm or 10 A4 size sheets.
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