| 摘要 |
A fuel cell having excellent properties is provided in which, when an enzyme is immobilized in at least one of a positive electrode and a negative electrode, a sufficient buffering capability can be provided even in a high power output operation and the inherent capability of the enzyme can be sufficiently exerted. In a biofuel cell including a structure in which a positive electrode 2 and a negative electrode 1 face each other with an electrolyte layer 3 therebetween, the electrolyte layer 3 containing a buffer material, and the biofuel cell including an enzyme immobilized in at least one of the positive electrode 2 and the negative electrode 1, the electrolyte layer 3 contains a compound including an imidazole ring as a buffer material and at least one acid selected from the group consisting of acetic acid, phosphoric acid, and sulfuric acid is further added to the electrolyte layer 3. As the compound including an imidazole ring, imidazole, 1-methylimidazole, 2-methylimidazole, 4-methylimidazole, 2-ethylimidazole, or the like is used.
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