Johnson Matthey Public Limited Company

Technical Fibre Products Limited

Johnson Matthey Fuel Cells Limited

Julian Andrew Siodlak

Jonathan David Brereton Sharman

Julia Margaret Rowe

Nigel Julian Walker

George Thomas Quayle

Andrew James Fletcher

Fletcher Andrew James James

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 &#x3bc;m. 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.

Gas diffusion substrate

Growing community of inventors

Cumbria, United Kingdom

Julian Andrew Siodlak