DEMS Study of NO2− Reduction on Pt(100) Electrode in Alkaline Solution

Newly developed “one point touch” DEMS (Differential Electrochemical Mass Spectrometer) was applied to a small Pt single crystal electrode of ca. 0.1 cm2 and succeeded to follow the electrode reactions of NO2− in situ, together with voltammogram at a potential sweep of 2–10 mVs−1. It was confirmed that NO2− is reduced to NH3 at Pt(100) in 0.2–0.5 V (RHE). NH3 is oxidized exclusively to N2 around 0.6 V (RHE).