SENSOR AND METHOD FOR SENSING FUEL CONCENTRATION, METHOD AND SYSTEM APPARATUS FOR FUEL RECIRCULATION OF FUEL CELL USING THE SAME, FUEL CELL USAGE APPARATUS USING THE SAME

摘要

PURPOSE: An apparatus and a method for sensing fuel concentration, a system apparatus and a method for the fuel recirculation of a fuel cell using the same, and a fuel cell using apparatus using the same are provided to use various materials having low conductivity as the material of an electrolyte film. CONSTITUTION: An apparatus(100) for sensing fuel concentration comprises a unit cell, a stack, and an open circuit voltage meter. The unit cell comprises electrolyte films(10), a reference electrode(13), and a measurement electrode(15). The reference electrode is formed in one side of the electrolyte films, and the measurement electrode is formed in the other side. The stack stacks the electrolyte films. The open circuit voltage meter measures the open circuit voltage of the unit cell or the stack.