| 摘要 |
Provided is a method for operating a fuel cell involving supplying an electrode with a low or non-humidified gas that achieves no significant decrease of voltage as compared with when a high-humidified feed gas is used. The method for operating a fuel cell having a membrane electrode assembly includes a cathode, an anode and an electrolyte membrane interposed between both the electrodes, wherein the cathode has a layer including an oxygen reducing catalyst including composite particles which include atoms of a metal element M1, carbon, nitrogen and oxygen and in which primary particles of a compound of the metal element M1 are dispersed in a carbon structure, which method includes supplying the cathode with an oxidizing agent gas which includes an oxygen gas and which has a relative humidity at a temperature of the membrane electrode assembly of 60% or less, and supplying the anode with a fuel gas. |
| 主权项 |
1. A method for operating a fuel cell comprising a membrane electrode assembly including a cathode, an anode and an electrolyte membrane interposed between both the electrodes,
wherein the cathode has a layer comprising an oxygen reducing catalyst comprising composite particles, the composite particles being particles in which primary particles of a compound of a metal element M1 are dispersed in a structure composed of carbon, the composite particles comprising an atom of at least one metal element M1 selected from the group consisting of titanium, niobium, zirconium, tantalum and tin, and atoms of carbon, nitrogen and oxygen, wherein carbon is contained at not less than 0.5 mol and not more than 7 mol, nitrogen is contained at more than 0 mol and not more than 1 mol, and oxygen is contained at not less than 1 mol and not more than 3 mol based on 1 mol of the whole of the metal element M1, which method comprises supplying the cathode with an oxidizing agent gas which comprises an oxygen gas and which has a relative humidity at a temperature of the membrane electrode assembly of not more than 60%, and supplying the anode with a fuel gas. |
