Gas diffusion substrate
First Claim
1. A gas diffusion substrate comprisinga non-woven network of carbon fibres wherein the carbon fibres are graphitised but the non-woven network has not been subjected to a graphitisation process;
- anda mixture of graphitic particles and hydrophobic polymer disposed within the network, wherein the longest dimension of at least 90% of the graphitic particles is between 20 and 0.1 μ
m.
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Accused Products
Abstract
A gas diffusion substrate includes a non-woven network of carbon fibres, the carbon fibres are graphitised but the non-woven network has not been subjected to a graphitisation process. A mixture of graphitic particles and hydrophobic polymer is disposed within the network. The longest dimension of at least 90% of the graphitic particles is less than 100 μm. A process for manufacturing gas diffusion substrates includes depositing a slurry of graphitised carbon fibres onto a porous bed forming a wet fibre network, preparing a suspension of graphitic particles and hydrophobic polymer, applying onto, and pulling the suspension into, the network, and drying and firing the network. Another process includes mixing a first slurry of graphitic particles and hydrophobic polymer with a second slurry of graphitised carbon fibres and liquid forming a third slurry, depositing the third slurry onto a porous bed forming a fibre-containing layer, and drying and firing the layer.
21 Citations
34 Claims
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1. A gas diffusion substrate comprising
a non-woven network of carbon fibres wherein the carbon fibres are graphitised but the non-woven network has not been subjected to a graphitisation process; - and
a mixture of graphitic particles and hydrophobic polymer disposed within the network, wherein the longest dimension of at least 90% of the graphitic particles is between 20 and 0.1 μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- and
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21. A gas diffusion substrate comprising:
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a non-woven network of carbon fibres wherein the carbon fibres are graphitised but the non-woven network has not been subjected to a graphitisation process; and a mixture of graphitic particles and hydrophobic polymer disposed within the network, wherein the longest dimension of at least 90% of the graphitic particles is between 100 μ
m.wherein the weight ratio of graphitic particles to hydrophobic polymer is between 50;
1 and 2;
1. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification