New insights into the mechanism of nitrite reduction on a platinum electrode

作者：Duca M; Kavvadia V; Rodriguez P; Lai S C S; Hoogenboom T; Koper M T M^*

来源：Journal of Electroanalytical Chemistry, 2010, 649(1-2): 59-68.

DOI：10.1016/j.jelechem.2010.01.019

• Nitrite
• Nitrous acid
• Nitrogen cycle
• On line mass spectroscopy
• Ring-disk electrodes
• Fourier transform infrared spectroscopy

This paper reinvestigates the mechanism of HNO2 and NO2- reduction on polycrystalline platinum as a function of electrolyte pH and reactant concentration Intermediates and/or reaction products were detected by means of various (combined) techniques RRDE (for NH2OH detection) OLEMS (for volatile products) and FTIRS In acidic media HNO2 is depleted due to homogeneous-phase reactions (accelerated by stirring) that generate NO the latter species which readily forms an adlayer on Pt is reduced in a first wave to N2O while HNO2 is reduced in a following diffusion-limited wave to mainly NH2OH The two waves display different reaction orders Loss of HNO2 (as NO) in the blanketing Ar stream hampered an accurate quantitative evaluation of the product distribution When the pH is Increased NO2- is reduced in a single peak with a much lower current density than in the previous case In RDE experiments the peak was found to decrease with increasing r

• 出版日期2010-11-15