MICROBIAL FUEL CELL, MICROBIAL FUEL CELL SYSTEM, AND METHOD FOR USING MICROBIAL FUEL CELL

摘要

A microbial fuel cell (1) includes an electrolysis solution (2) including organic matter, a negative electrode (3) holding anaerobic microorganisms and being in contact with the electrolysis solution, and a positive electrode (4) including a water-repellent layer (41) and a gas diffusion layer (42) placed on the water-repellent layer. A ratio of an area of the negative electrode to an area of the gas diffusion layer is defined as T₁, and a ratio of a maximum current density of the positive electrode at an electric potential of the positive electrode in an electrode system including the electrolysis solution, the negative electrode, and the positive electrode to a maximum current density of the negative electrode at an electric potential of the negative electrode in the electrode system is defined as T₂. The ratios T₁ and T₂ satisfy the relationship of the expression (1): T₂^1/2≦T₁≦T₂².