All electrochemical measurements were carried out using potentiostat
[CH Instruments, model 619B, Texas, USA] at room temperature
in an electrochemical cell of volume 10 mL with a standard three
electrode configuration. Modified glassy carbon electrode is used as
working electrode. Pt wire (purity 99.99%) is the counter electrode and
Ag/AgCl (3 M KCl) acts as reference electrode. Solutions are degassed
using ultra pure nitrogen gas for 15 min before electrochemical
measurements. All pH measurements were carried out using Control
Dynamics pH meter. FTIR measurements were recorded in the range
400–4000 cm−1 with 4 cm−1 resolution.