Batch Injection Coulometry of Hypochlorite Using Carbon Felt Electrodes Modified with Nitrogen-containing Functional Groups

Coulometric Analysis of Nitrite Using Electrochemically Activated Carbon Felt Electrode

“…As previously reported, nitrogen atoms containing functional groups can be easily introduced onto a GC electrode surface by the electrode oxidation of ammonium carbamate in an aqueous medium at a highly positive electrode potential, and we named this electro-oxidized GC electrode as an aminated GC electrode. (15)(16)(17) The GC or carbon felt electrode covalently attached with nitrogen-containing functional groups was fabricated by electrolysis. As described, the carbon felt was electro-oxidized in 0.1 M ammonium carbamate aqueous solution at a constant potential of 1.1 V for 1 h (60 min).…”

“…(13)(14)(15) Recently, we have proposed that nitrogen atoms containing functional groups can be easily introduced onto the surface of a GC electrode by the electrode oxidation of ammonium carbamate in an aqueous medium at a highly positive electrode potential, and we named this electro-oxidized GC electrode as an aminated GC electrode. (15)(16)(17) In this electrochemical surface modification, not only the primary amine group (for example, aniline-like aromatic amine moiety) but also other nitrogencontaining functional groups (for example, the secondary amine-like moieties containing pyrrole-type nitrogen and quaternary amine-like moieties containing graphitic quaternary nitrogen) can be introduced onto a GC electrode surface. (18,19) Our group has reported that the observed hydrogen redox wave is related to the mutual redox reactions between hydrazino, diazene, and diazo groups bonded to the electrode surface.…”