Patent ID: 7816041

Claim:
A fuel cell comprising a substrate having first and second grooves formed in juxtaposition, the grooves each having an opening and an inner wall, an electrolyte membrane lying on the substrate so as to cover the openings of the first and second grooves to define first and second flow channels, and catalyst-bearing current collector layer sections disposed on the inner wall of the first groove or the inside surface of the electrolyte membrane defining the first channel and the inner wall of the second groove or the inside surface of the electrolyte membrane defining the second channel, respectively, wherein a fuel liquid flows through the first channel to undergo anodic reaction, an oxidant liquid flows through the second channel to undergo cathodic reaction, hydrogen ions migrate from the first channel to the second channel through the electrolyte membrane, said first and second grooves have a width of up to 1,000 μm and a depth of up to 1,000 μm, the oxidant liquid is an aqueous hydrogen peroxide solution, said aqueous hydrogen peroxide solution has a hydrogen peroxide concentration of 0.03 to 3mol/L, and said aqueous hydrogen peroxide solution flows through the second channel at a flow rate of 1 to 50 ml/min per square millimeter of the channel cross-sectional area.