Table 12.1
(continued)
Photocatalysts
Cocatalysts
Optimal product yield
(μmol/gÁh exception unit
stated otherwise)
Brief photocatalyst preparation
method
CO
2 photoreduction evaluation
details
Refs.
32 Pt/carbon-coated
In
2 O
3 nanobelt
Pt, C
CO (126.6); CH
4 (27.9) Hydrothermal synthesis for carbon
layer using glucose as precursor and
photo-deposition method for depositing Pt from H
2 PtCl
4
200 mg catalyst dispersed in a water
solution (200 mL) with 10 vol%
triethanolamine placed in a closed
gas circulation–evacuation reactor,
1.01 bar CO
2 ; 300 W Xe lamp was
used as the light source, 25
C
[47]
33 C/H-g-C
3 N
4
C
CO (22.6); CH
4 (12.5) in
9 h
One-step pyrolysis method using
melamine and natural soybean oil as
precursors
0.1 g catalyst in stainless steel reactor, CO
2 and H
2 O mixture; 500 W Xe
lamp was used as the light source,
temperature was kept at 303 K, and
pressure was maintained at 110 KPa
[48]
34 TiO
2 /graphene
sandwich
structure
Graphene
CH
4 (8); C
2 H
6 (16.8)
One-step hydrothermal method
0.1 g catalyst placed on a glass reactor with 4.2 cm
2
area, CO
2 and 1 mL
H
2 O; 300 W Xe lamp was used as the
light source
[49]
35 G-Ti
0.91 O
2 hollow
sphere
Graphene
CH
4 (1.14); CO (8.91)
The LBL self-assembly approach
using GO nanosheets and Ti
0.91 O
2
nanosheets as inorganic shell building blocks
0.1 g catalyst placed on a glass reactor with 4.2 cm
2
area, CO
2 and 1 mL
H
2 O; 300 W Xe lamp was used as the
light source
[50]
36 Co
3 O
4 hexagonal
platelets
[Ru(bpy)
3 ]Cl
2
CO (3523)
Co
3 O
4 hexagonal platelets was
obtained by calcinate
β-Co(OH) 2 at
400
C, commercial [Ru(bpy)
3 ]Cl
2
10 mg Co
3 O
4 platelets and 10 mg
[Ru(bpy)
3 ]Cl
2 .6H
2 O, 30 mL solvent
(MeCN/TEOA/H
2 O
¼ 3:1:1
vol/vol); CO
2 1 bar, 300 W Xe lamp
with 420
filter (293.61 mW/cm
2
) was
used as the light source
[51]
282
12 Roles and Properties of Cocatalysts in Semiconductor-Based Materials. . .
(continued)
Photocatalysts
Cocatalysts
Optimal product yield
(μmol/gÁh exception unit
stated otherwise)
Brief photocatalyst preparation
method
CO
2 photoreduction evaluation
details
Refs.
32 Pt/carbon-coated
In
2 O
3 nanobelt
Pt, C
CO (126.6); CH
4 (27.9) Hydrothermal synthesis for carbon
layer using glucose as precursor and
photo-deposition method for depositing Pt from H
2 PtCl
4
200 mg catalyst dispersed in a water
solution (200 mL) with 10 vol%
triethanolamine placed in a closed
gas circulation–evacuation reactor,
1.01 bar CO
2 ; 300 W Xe lamp was
used as the light source, 25
C
[47]
33 C/H-g-C
3 N
4
C
CO (22.6); CH
4 (12.5) in
9 h
One-step pyrolysis method using
melamine and natural soybean oil as
precursors
0.1 g catalyst in stainless steel reactor, CO
2 and H
2 O mixture; 500 W Xe
lamp was used as the light source,
temperature was kept at 303 K, and
pressure was maintained at 110 KPa
[48]
34 TiO
2 /graphene
sandwich
structure
Graphene
CH
4 (8); C
2 H
6 (16.8)
One-step hydrothermal method
0.1 g catalyst placed on a glass reactor with 4.2 cm
2
area, CO
2 and 1 mL
H
2 O; 300 W Xe lamp was used as the
light source
[49]
35 G-Ti
0.91 O
2 hollow
sphere
Graphene
CH
4 (1.14); CO (8.91)
The LBL self-assembly approach
using GO nanosheets and Ti
0.91 O
2
nanosheets as inorganic shell building blocks
0.1 g catalyst placed on a glass reactor with 4.2 cm
2
area, CO
2 and 1 mL
H
2 O; 300 W Xe lamp was used as the
light source
[50]
36 Co
3 O
4 hexagonal
platelets
[Ru(bpy)
3 ]Cl
2
CO (3523)
Co
3 O
4 hexagonal platelets was
obtained by calcinate
β-Co(OH) 2 at
400
C, commercial [Ru(bpy)
3 ]Cl
2
10 mg Co
3 O
4 platelets and 10 mg
[Ru(bpy)
3 ]Cl
2 .6H
2 O, 30 mL solvent
(MeCN/TEOA/H
2 O
¼ 3:1:1
vol/vol); CO
2 1 bar, 300 W Xe lamp
with 420
filter (293.61 mW/cm
2
) was
used as the light source
[51]
282
12 Roles and Properties of Cocatalysts in Semiconductor-Based Materials. . .