超细Ir催化剂对氨氧化的电催化性能

Electrocatalytic Performance of Ultrafine Ir Catalyst for Oxidation of Ammonia

报道了一种新型的、用NH4F作络合剂的络合还原法制备的Ir催化剂及其对氨氧化的电催化性能.结果表明,由于溶液中的Ir3+和NH4F形成络合物,因此用这种络合法制得Ir催化剂中Ir粒子的平均粒径为2.8nm,要比不加络合剂时制得的Ir催化剂中Ir粒子的平均粒径(7.5nm)小很多.所以,用络合还原法制得的Ir催化剂对氨氧化的电催化活性和稳定性都比不加络合剂时制得的Ir催化剂好很多.且该制备方法简单、实用,适用于催化剂的实际生产.

The electrocatalytic performance of the Ir catalyst prepared with a new complex reduction method using NH4F as the complexing reagent for the oxidation of ammonia was reported. The results indicated that the average size of Ir particles in the Ir catalyst prepared with the complex reduction method was 2.8 nm, which was much smaller than that （7.5 nm） of the Ir catalyst prepared with the reduction method without the complexing reagent, because Ir^3＋ could form the complex with NH4F. Thus, the electrocatalytic activity and stability of the Ir catalyst prepared with the complex reduction method for the oxidation of ammonia are better than that of the Ir catalyst prepared with the reduction method without the complexing reagent. This preparation method is very simple. Therefore, it is hopeful to have a practical application in the catalyst preparation.