NOVELTY - A microfibrous fuel cell structure is fabricated by providing a fibrous substrate structure comprising removable substrate material (52') in solid phase, coating a layer of membrane-forming material (62') over the fibrous substrate structure, and subsequently removing the at least one removable substrate material, to form a hollow fibrous membrane separator having a bore side and a shell side.    USE - For fabricating multiple microfibrous fuel cell structures (claimed).    ADVANTAGE - The method allows continuous and automated fabrication of microfibrous fuel cell structures of improved quality. It is faster and easier with little or no blockage of the required fluid path, when compared to prior art method.    DETAILED DESCRIPTION - Fabrication of microfibrous fuel cell structure comprises providing a fibrous substrate structure comprising removable substrate material in solid phase, coating a layer of membrane-forming material over the fibrous substrate structure, and subsequently removing the at least one removable substrate material, to form a hollow fibrous membrane separator having a bore side and a shell side.    The microfibrous fuel cell structure comprises inner current collector (42'), outer current collector, hollow fibrous membrane separator, inner electrocatalyst layer coating, and outer electrocatalyst layer coating on the hollow fibrous membrane separator at its shell side. The hollow fibrous membrane separator comprises electrolyte medium and is in electrical contact with the inner current collector at its bore side and the outer current collector at its shell side. The bore side of the hollow fibrous membrane separator comprises lumen (71) that allows the passage of fluid.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a process for producing a hollow fibrous membrane separator with an inner current collector.    Inner current collector (42')    Removal interface (51)    Substrate material (52')    Soluble fiber (56)    Membrane-forming material (62')    Lumen (71)