Abstract: The influence of the crystal structure of TiO2 on the electrocatalytic performance of Ir catalyst supported on TiO2(Ir/TiO2) for the ammonia oxidation was is investigated. It shows that the electrocatalytic performance of the Ir/TiO2 with rutile structure(Ir/TiO2-R) is much better than that of the Ir/TiO2 with the anatase structure(Ir/TiO2-A). The physicochemical and electrochemical characterizations reveal that the enhancement in the electrocatalytic performance of the Ir/TiO2-R catalyst may be attributed to the uniform dispersion of Ir nanoparticles and a large surface area of TiO2-R.

Key words: Ammonia oxidation, Rutile structure, Anatase structure, Ir supported on TiO2 catalyst, Current type Electrochemical sensor