| 摘要 |
PURPOSE:To provide an electrode catalyst layer for a phosphoric acid type fuel cell which is excellent in stability of output voltage by using a catalyst carrier whose surface is composed of a carbon black region and a carbon fluoride region. CONSTITUTION:An electrode is formed of a catalyst carrier 2 with noble metal 1 such as platinum supported and an electrode catalyst layer 5 with fluorine resin 3 as a water-repellent material uniformly mixed laminated on an electrode substrate 4 made of a carbon material which is porous and excellent in electrical conductivity. The surface of the catalyst carrier 2 is composed of a carbon black region and a carbon fluoride region, while the noble metal which is supported on the surface of the catalyst carrier forms catalyst and the fluorine resin 3 is used to bond the catalyst. The carbon black region of the surface of the catalyst carrier is well wetted with phosphoric acid. On the other hand, the carbon fluoride region is not wetted with phosphoric acid. The carbon fluoride region is to be in contact with reaction gas. Thus three-phase interfaces are stably formed on the surface of the catalyst carrier and infiltration of phosphoric acid can be prevented. |
