NOVELTY - A fuel cell assembly comprises a central ionic membrane (302) having a membrane first and second surfaces; first matrix (308) formed of an organic polymer having first matrix first surface in contact with membrane first surface, and first matrix second surface; second matrix (310) formed of an organic polymer having second matrix first surface in contact with membrane second surface, and second matrix second surface; first current collector (304) within first matrix; and second current collector (306) within second matrix and in electrical communication with first current collector.    USE - A fuel cell assembly for use with a source of a gas or liquid reductant and a source of gaseous oxidant, or for a fuel cell (claimed).    ADVANTAGE - The fuel cell has good electrochemical and mechanical performance, and stabilized current voltage output under varying load conditions. The gas diffusion electrodes with embedded nickel metal mesh collector, allow catalyst to be formed on active sites and avoid the need for additional catalyst reduction stages.    DETAILED DESCRIPTION - A fuel cell assembly comprises:    (1) a central ionic membrane (302) having a membrane first surface and membrane second surface;    (2) first matrix (308) formed of an organic polymer having first matrix first surface in contact with membrane first surface, and first matrix second surface;    (3) second matrix (310) formed of an organic polymer having second matrix first surface in contact with membrane second surface, and second matrix second surface;    (4) first current collector (304) within first matrix; and    (5) second current collector (306) within second matrix and in electrical communication with first current collector.    Each of first and second matrices has a pore structure to allow gas permeation within the matrix and water exudation out of matrix, and contains particulate carbon. Portions of first matrix surface and second matrix surface comprise catalytic material surface layers deposited on it to constitute catalytic portions. The second matrix comprises a first polymer layer and second polymer layer. The first polymer layer has a surface constituting second matrix surface. The second polymer layer has a surface constituting second matrix first surface. The first polymer layer is of a lower hydrophobicity than second polymer layer to allow permeation of liquid reductant within first polymer layer. INDEPENDENT CLAIMS are included for:    (1) preparation of fuel cell assembly comprising embedding first and second current collectors in first and second particulate carbon-containing matrices, respectively, and locating central membrane between first and second matrices; and depositing on first and second matrices first surfaces a solution of compound of catalytic material in oxidation state and effect reduction to catalytic material and production of catalytic portions;    (2) a fuel cell comprising an assembly, oxidant feed unit in communication with first matrix, and reductant feed unit in communication with second matrix; and    (3) a gas diffusion electrode for use with a fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagrammatic sectional view of a membrane electrode assembly.    Central ionic membrane (302)    First current collector (304)    Second current collector (306)    First matrix (308)    Second matrix (310)