Provided is a process for producing a fuel cell electrode catalyst having high catalytic activity which uses a transition metal, e.g., titanium, which process comprises thermal treatment at relatively low temperature, i.e., not including thermal treatment ...

The invention provides catalysts which are not corroded in acidic electrolytes or at high potential and have excellent durability and high oxygen reducing ability. The catalysts include a niobium-containing oxycarbonitride having I 2 /(I 1 + I 2 ) of not l...