Surface-modified, dye-sensitized niobate nanosheets enabling an efficient solar-driven Z-scheme for overall water splitting
While dye-sensitized metal oxides are good candidates as H 2 evolution photocatalysts for solar-driven Z-scheme water splitting, their solar-to-hydrogen (STH) energy conversion efficiencies remain low because of uncontrolled charge recombination reactions. Here, we show that modification of Ru dye–s...
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Published in | Science advances Vol. 8; no. 32; p. eadc9115 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
AAAS
12.08.2022
American Association for the Advancement of Science |
Subjects | |
Online Access | Get full text |
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Summary: | While dye-sensitized metal oxides are good candidates as H
2
evolution photocatalysts for solar-driven Z-scheme water splitting, their solar-to-hydrogen (STH) energy conversion efficiencies remain low because of uncontrolled charge recombination reactions. Here, we show that modification of Ru dye–sensitized, Pt-intercalated HCa
2
Nb
3
O
10
nanosheets (
Ru
/Pt/HCa
2
Nb
3
O
10
) with both amorphous Al
2
O
3
and poly(styrenesulfonate) (PSS) improves the STH efficiency of Z-scheme overall water splitting by a factor of ~100, when the nanosheets are used in combination with a WO
3
-based O
2
evolution photocatalyst and an I
3
−
/I
−
redox mediator, relative to an analogous system that uses unmodified
Ru
/Pt/HCa
2
Nb
3
O
10
. By using the optimized photocatalyst, PSS/
Ru
/Al
2
O
3
/Pt/HCa
2
Nb
3
O
10
, a maximum STH of 0.12% and an apparent quantum yield of 4.1% at 420 nm were obtained, by far the highest among dye-sensitized water splitting systems and comparable to conventional semiconductor-based suspended particulate photocatalyst systems.
Surface modification of a dye-sensitized nanosheet photocatalyst improved the solar water splitting activity by ~100 times. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Japan Society for the Promotion of Science (JSPS) USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB) SC0019781; JP19H02511; JP22H01862; JP22H05148; JP21K20555 These authors contributed equally to this work. |
ISSN: | 2375-2548 2375-2548 |
DOI: | 10.1126/sciadv.adc9115 |