Figure 6

FT-IR spectra of BG as is (a) and after immersion in 0.5 M NaOH for 10 min. (b), then oxidized at 1.3 V for 10 min. (c) after that, it is reduced at the potential of CI (0.35V) (d). The spectrum of a new BG after its direct reduction at −1.1V in a new solution for 10 min. is (e).