AIR ELECTRODE, METAL-AIR BATTERY, FUEL BATTERY, AND METHOD FOR MANUFACTURING AIR ELECTRODE

PROBLEM TO BE SOLVED: To provide an air electrode with a low electrical resistivity.SOLUTION: An air electrode comprises: a current collector; and a catalyst layer 6 provided on the current collector. The catalyst layer 6 includes catalyst particles 3 having a catalyst activity for an electrode reaction of the air electrode and a metal binder 9. The catalyst layer 6 is a thermal spraying layer, and includes complex particles having the catalyst particles 3 and a porous coating layer 5 covering each catalyst particle 3. The porous coating layer 5 is a layer comprising conductive particles 4, and preferably a layer comprising carbon particles. The catalyst particles 3 are composed of metal oxide particles. In the air electrode, the current collector preferably includes a metal mesh or porous metal plate. In addition, a metal-air battery comprises: the air electrode; a metal electrode; and an electrolyte. A fuel battery comprises: the air electrode; a fuel electrode; and an electrolyte.SELECTED DRAWING: Figure 3 【課題】電気抵抗率の低い空気極の提供。【解決手段】集電体と、前記集電体上に設けられた触媒層６とを備え、触媒層６は、空気極の電極反応に対する触媒活性を有する複数の触媒粒子３と、金属バインダ９とを含む空気極。触媒層６は溶射であり、触媒粒子３と触媒粒子３を被覆する多孔質被覆層５と有する複合粒子を複数含み、多孔質被覆層５が複数の導電性粒子４からなり、好ましくは複数の炭素粒子からなる層であり、触媒粒子３が、金属酸化物の粒子である、空気極。前記集電体が、好ましくは、金属メッシュ又は多孔質金属板を含む、空気極。亦、前記空気極と、金属極と、電解質とを備えた金属空気電池。更に、前記空気極と、燃料極と、電解質とを備えた燃料電池。【選択図】図３