NOVELTY - The cell is placed in contact with a current collector comprising a fibrous, electrically conductive material of about the same length and outside diameter as the inner electrode, or placing the assembly in contact with an outer electrode fiber of about the same length and diameter of the inner electrode, forming an electrochemical cell.    USE - Used in making batteries, fuel cells or other electrochemical reaction cells.    ADVANTAGE - The high surface area available to the electrocatalyst reduces the requirement of the unused bulk quantities on the electrodes, and reduces the material and fabrication cost of the cells.    DETAILED DESCRIPTION - Fabrication of a fibrous electrochemical cell comprising a fiber which extends longer as compared to the fiber diameter, comprises (a) placing a membrane separator having a bore side, shell side and lumen which houses the inner electrode and allows for passage of liquid or gas through the core side, around a fibrous positive or negative inner electrode which comprises an electrically conductive fiber in contact with a positive or negative electrocatalyst or electroactive material, forming an assembly; (b) disposing an electrolyte in the pores of the membrane separator of the assembly; (c) impregnating the shell side pores of the separator with a material or forming a thin layer of the material in contact with the separator, which material comprises a positive or negative electrocatalyst and an electrically conductive material forming an electrochemical cell; and (d) placing the cell in contact with a current collector comprising a fibrous, electrically conductive material of about the same length and outside diameter as the inner electrode, or placing the assembly in contact with an outer electrode fiber of about the same length and diameter of the inner electrode, forming an electrochemical cell. The outer electrode comprises an electrically conductive fibrous material in contact with a layer of positive or negative electrocatalyst or electroactive material.    DESCRIPTION OF DRAWING(S) - Figure 2a shows the hollow fiber membrane as separator for fibrous electrode.    Hollow Fiber Membrane (1)    Fibrous Electrode (4)