Bottom-up and top-down methods to improve catalytic reactivity for photocatalytic production of hydrogen peroxide using a Ru-complex and water oxidation catalystsElectronic supplementary information (ESI) available: Experimental section, time courses of H2O2 production under different conditions (Fig. S1, S2, S14-S17), TEM images (Fig. S3, S5 and S13), X-ray photoelectron spectra of Ir(OH)3 (Fig. S4), time course of H2O2 decomposition in the presence of NiFe2O4 (Fig. S6), DLS data (Fig. S7-S10),
Hydrogen peroxide (H 2 O 2 ) was produced from water and dioxygen using [Ru II (Me 2 phen) 3 ] 2+ (Me 2 phen = 4,7-dimethyl-1,10-phenanthroline) as a photocatalyst and [Ir(Cp*)(H 2 O) 3 ] 2+ (Cp* = η 5 -pentamethylcyclopentadienyl) as a precursor of a water oxidation catalyst in the presence of Sc 3...
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| Main Authors | , , , , , |
|---|---|
| Format | Journal Article |
| Language | English |
| Published |
02.06.2015
|
| Online Access | Get full text |
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| Summary: | Hydrogen peroxide (H
2
O
2
) was produced from water and dioxygen using [Ru
II
(Me
2
phen)
3
]
2+
(Me
2
phen = 4,7-dimethyl-1,10-phenanthroline) as a photocatalyst and [Ir(Cp*)(H
2
O)
3
]
2+
(Cp* = η
5
-pentamethylcyclopentadienyl) as a precursor of a water oxidation catalyst in the presence of Sc
3+
in water under visible light irradiation. TEM and XPS measurements of residues in the resulting solution after the photocatalytic production of H
2
O
2
indicated that [Ir(Cp*)(H
2
O)
3
]
2+
was converted to Ir(OH)
3
nanoparticles, which are actual catalytic species. The Ir(OH)
3
nanoparticles produced
in situ
during the photocatalytic production of H
2
O
2
were smaller in size than those prepared independently from hydrogen hexachloroiridiate (H
2
IrCl
6
), and exhibited higher catalytic reactivity for the photocatalytic production of H
2
O
2
. The photocatalytic production of H
2
O
2
from water and dioxygen was also made possible when Ir(OH)
3
nanoparticles were replaced by nickel ferrite (NiFe
2
O
4
) nanoparticles, which are composed of more earth abundant metals than iridium. The size of NiFe
2
O
4
nanoparticles became smaller during the photocatalytic production of H
2
O
2
to exhibit higher catalytic reactivity in the second run as compared with that in the first run. NiFe
2
O
4
nanoparticles obtained by the treatment of NiFe
2
O
4
in an aqueous solution of Sc
3+
exhibited 33-times higher catalytic reactivity in H
2
O
2
-production rates than the as-prepared NiFe
2
O
4
. Thus, both the bottom-up method starting from a molecular complex [Ir(Cp*)(H
2
O)
3
]
2+
and the top-down method starting from as-prepared NiFe
2
O
4
to obtain nanoparticles with smaller size resulted in the improvement of the catalytic reactivity for the photocatalytic production of H
2
O
2
from water and dioxygen.
Hydrogen peroxide (H
2
O
2
) was produced from water and dioxygen using a Ru-complex photocatalyst and water oxidation catalysts of metal-containing nanoparticles produced
in situ
under visible light irradiation. |
|---|---|
| Bibliography: | decomposition in the presence of NiFe 2 3 10.1039/c5ta02446c 4 (Fig. S4), time course of H Electronic supplementary information (ESI) available: Experimental section, time courses of H (Fig. S6), DLS data (Fig. S7-S10), powder XRD patterns (Fig. S11), UV-Vis spectra (Fig. S12) and appendix for the derivation of specific surface area of particles. See DOI O production under different conditions (Fig. S1, S2, S14-S17), TEM images (Fig. S3, S5 and S13), X-ray photoelectron spectra of Ir(OH) |
| ISSN: | 2050-7488 2050-7496 |
| DOI: | 10.1039/c5ta02446c |