CH 4 yield and selectivity for CH 4 which are 1.9 and 4.4 times higher than 0.8%
Pt/HTSO. To highlight the spatial locations of Pt and CoO x in CO2PR, the Pt-CoO x /
HTSO was prepared by randomly loading Pt and CoO x on the surface of HTSO; the
CO2PR result shows even lower CO 2 reduction activity. The enhanced transient
photocurrent response and decreased intensity of PL emission peaks (360 and
470 nm) all confirmed the spatial separated double cocatalysts promote the charge
separation effectively (Fig. 12.8c, d). On the contrary, the random loading of Pt and
CoO x on the surface of HTSO results in many electron-hole recombination centers,
which is detrimental to charge separation and thus shows poor performance in
CO2PR.
Fig. 12.8 (a) TEM and selective HR-TEM images of Pt/HRTSO. (b) Elemental mapping image of
Pt/HRTSO, the red dots denote as Pt element and the green dots denote as Co element. (c) Transient
photocurrent spectra of different samples (300 W Xe lamp with AM 1.5 filter was used as the light
source and 0.5 M Na 2 SO 4 solution is used as the electrolyte). (d) Room temperature PL spectra of
different samples (excitation wavelength at 315 nm). (Reprinted with permission from Ref.
[8]. Copyright 2016, Royal Society of Chemistry)
296
12 Roles and Properties of Cocatalysts in Semiconductor-Based Materials. . .
Pt/HTSO. To highlight the spatial locations of Pt and CoO x in CO2PR, the Pt-CoO x /
HTSO was prepared by randomly loading Pt and CoO x on the surface of HTSO; the
CO2PR result shows even lower CO 2 reduction activity. The enhanced transient
photocurrent response and decreased intensity of PL emission peaks (360 and
470 nm) all confirmed the spatial separated double cocatalysts promote the charge
separation effectively (Fig. 12.8c, d). On the contrary, the random loading of Pt and
CoO x on the surface of HTSO results in many electron-hole recombination centers,
which is detrimental to charge separation and thus shows poor performance in
CO2PR.
Fig. 12.8 (a) TEM and selective HR-TEM images of Pt/HRTSO. (b) Elemental mapping image of
Pt/HRTSO, the red dots denote as Pt element and the green dots denote as Co element. (c) Transient
photocurrent spectra of different samples (300 W Xe lamp with AM 1.5 filter was used as the light
source and 0.5 M Na 2 SO 4 solution is used as the electrolyte). (d) Room temperature PL spectra of
different samples (excitation wavelength at 315 nm). (Reprinted with permission from Ref.
[8]. Copyright 2016, Royal Society of Chemistry)
296
12 Roles and Properties of Cocatalysts in Semiconductor-Based Materials. . .