MEMBRANE ELECTRODE ASSEMBLY USING NITROGEN-CONTAINING CARBON MATERIAL POWER IN POSITIVE ELECTRODE CATALYST AND PASSIVE DIRECT METHANOL FUEL CELL HAVING MEMBRANE ELECTRODE ASSEMBLY

摘要

PROBLEM TO BE SOLVED: To provide a high output passive direct methanol fuel cell using nitrogen-containing carbon material powder of high oxygen supply speed in positive electrode catalyst.SOLUTION: A passive direct methanol fuel cell uses a membrane electrode assembly, using a nitrogen-containing carbon material powder having the index I of meso hole amount of a bore of 20-50 nm, represented by following formula (1), of 0.6 or more. (The index I of meso hole amount of a bore of 20-50 nm)=(pore volume V(cc/g) of pore size (diameter) of 20-50 nm by a method of mercury penetration)/pore volume V(cc/g) of pore size (diameter) of 2-20 nm by a nitrogen absorption method). ... formula (1).SELECTED DRAWING: Figure 2