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Citation: HAN Yi-Ping, LUO Peng, CAI Chen-Xin, LU Tian-Honga. Effects of Pt and Ir Catalysts on Electrooxidation of NH₃ in Neutral Electrolyte[J]. Chinese Journal of Applied Chemistry, ;2008, 25(3): 361-365. shu

Effects of Pt and Ir Catalysts on Electrooxidation of NH₃ in Neutral Electrolyte

1.
a College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097;
2.
b Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: LU Tian-Honga,
Received Date: 5 April 2007
Available Online: 12 June 2007
Fund Project:

The electrocatalytic activities and selectivities of Pt and Ir catalysts for the NH₃ oxidation in neutral NaClO₄ solution were compared.It was found that the electrooxidation of NH₃ and NH₄OH at the Pt and Ir catalysts are similar.Thus,NH₄OH can be used to study instead of NH₃.Both peak currents of the anodic peaks of NH₄OH at Pt and Ir catalyst electrodes are linearly proportional to the concentration of NH₄OH.Thus,both the Pt and Ir can be used as the catalysts of the potential fixed electrochemical NH₃ sensor.When the concentration of NH₄OH is 0.013 mol/L,the anodic peaks of NH₄OH at the Pt and Ir electrodes are located at 0.4 and 0.8 V,respectively,indicating that the potential of the anodic peak of NH₄OH at the Pt catalyst is more negative than that at the Ir catalyst and it is the advantage of the Pt catalyst.However,the current density of the anodic peak of NH₄OH at the Ir catalyst is 2.5 times larger than that at the Pt catalyst.Furthermore,CO does not disturb the measurement of NH₄OH at the Ir catalyst,but obviously interferes the measurement of NH₄OH at the Pt catalyst.Therefore,the preliminary results indicate that the Ir catalyst is a suitable catalyst for the potential fixed electrochemical NH₃ sensor.
- ammonia,
- platinum,
- iridium,
- electrocatalytic oxidation,
- carbon monoxide
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Effects of Pt and Ir Catalysts on Electrooxidation of NH₃ in Neutral Electrolyte