424
A. Mathur et al.
Fig. 7 shows core-level spectra of a W, b O in WO 3 . c W and d O in WO 3 annealed at 550 °C
under vacuum condition. Reprinted (adapted) with permission from reference 17 Copyright (2019)
Wiley
531.5 eV, corresponding to transition metal-oxygen bond and oxygen deficit site.
The peak at 531.5 eV represents low oxygen coordination and hence assigned
to existence of oxygen vacancies. Due to the Co doping and oxygen vacancies,
enhancement in OER activity as well as in charge storage capacity in Zn-air
battery was observed in LaMn 0.75 Co 0.25 O 3−δ .
(g) Determination of Band positions: Band edge position of any photocatalyst is
critical to decide the overpotential and feasibility of any reaction over the catalysts surface. As, there are limited techniques like flat band position calculated
using Mott-Schottky plot, oxidation/reduction peak positions through cyclic
voltametric and XPS. The XPS can provide useful information about the band
position [19] on the sample surface. For example Fig. 8 shows the valence
band spectra of pristine TiO 2 and TiO 2-x . Wang et al. have synthesized pure
titania and black titania by aluminium reduction method [19]. They utilized this
black titania for solar water splitting. As Fig. 8 shows almost similar valence
band for both pristine titania and black titania which is well matched with
already reported literature [20]. The valence band maxima can be calculated
by linear extrapolation of the peaks to the baselines. From here, the band edge
position were calculated and found equal to the 2.05 eV also matched with
A. Mathur et al.
Fig. 7 shows core-level spectra of a W, b O in WO 3 . c W and d O in WO 3 annealed at 550 °C
under vacuum condition. Reprinted (adapted) with permission from reference 17 Copyright (2019)
Wiley
531.5 eV, corresponding to transition metal-oxygen bond and oxygen deficit site.
The peak at 531.5 eV represents low oxygen coordination and hence assigned
to existence of oxygen vacancies. Due to the Co doping and oxygen vacancies,
enhancement in OER activity as well as in charge storage capacity in Zn-air
battery was observed in LaMn 0.75 Co 0.25 O 3−δ .
(g) Determination of Band positions: Band edge position of any photocatalyst is
critical to decide the overpotential and feasibility of any reaction over the catalysts surface. As, there are limited techniques like flat band position calculated
using Mott-Schottky plot, oxidation/reduction peak positions through cyclic
voltametric and XPS. The XPS can provide useful information about the band
position [19] on the sample surface. For example Fig. 8 shows the valence
band spectra of pristine TiO 2 and TiO 2-x . Wang et al. have synthesized pure
titania and black titania by aluminium reduction method [19]. They utilized this
black titania for solar water splitting. As Fig. 8 shows almost similar valence
band for both pristine titania and black titania which is well matched with
already reported literature [20]. The valence band maxima can be calculated
by linear extrapolation of the peaks to the baselines. From here, the band edge
position were calculated and found equal to the 2.05 eV also matched with