2021
DOI: 10.1038/s41467-021-24061-4
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Charge carrier mapping for Z-scheme photocatalytic water-splitting sheet via categorization of microscopic time-resolved image sequences

Abstract: Photocatalytic water splitting system using particulate semiconductor materials is a promising strategy for converting solar energy into hydrogen and oxygen. In particular, visible-light-driven ‘Z-scheme’ printable photocatalyst sheets are cost-effective and scalable. However, little is known about the fundamental photophysical processes, which are key to explaining and promoting the photoactivity. Here, we applied the pattern-illumination time-resolved phase microscopy for a photocatalyst sheet composed of Mo… Show more

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Cited by 52 publications
(45 citation statements)
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“…The Raman spectrum of NiPS 3 UNSs (Supplementary Fig. 8a) exhibits the presence of E (2) g , A (1) 1g , A (2) 1g and A (3) 1g modes, in agreement with the prior report 60 . Moreover, the UV-Vis absorption spectrum of NiPS 3 UNSs (Supplementary Fig.…”
Section: Resultssupporting
confidence: 90%
“…The Raman spectrum of NiPS 3 UNSs (Supplementary Fig. 8a) exhibits the presence of E (2) g , A (1) 1g , A (2) 1g and A (3) 1g modes, in agreement with the prior report 60 . Moreover, the UV-Vis absorption spectrum of NiPS 3 UNSs (Supplementary Fig.…”
Section: Resultssupporting
confidence: 90%
“…This Z-scheme could be the main reason for composites showing better charge separation and transport properties. 24 The introduction of defect states in the forbidden gap reduces the recombination of the electron−hole pair (Figure S2b); however, the adsorbed species on defect sites such as hydroxyl groups can also contribute to arresting the recombination, which has previously been reported in a study. 25 The slight difference in recombination between 3NS and 3NSR can be reasoned by an increase in defect density in the latter (Figure 1d), which is attributed to surface dipoles.…”
Section: Resultsmentioning
confidence: 51%
“…The formation of the Z-scheme has its own advantages such as preserving high redox potentials and enhanced charge separation. This Z-scheme could be the main reason for composites showing better charge separation and transport properties …”
Section: Resultsmentioning
confidence: 93%
“…As mentioned above, the heterojunction of type II is commonly proposed for the Bi 2 WO 6 –TiO 2 system ( Figure 9 a) but the energy bands of Bi 2 WO 6 are located lower than the bands of TiO 2 , which prevents the transfer of holes from TiO 2 . At the same time, the energy levels of nitrogen species in TiO 2 -N are located substantially higher than the VB of TiO 2 [ 54 ] and a Z-scheme heterojunction, when the photogenerated electrons from the CB of Bi 2 WO 6 would interact with the photogenerated holes from nitrogen levels of TiO 2 ( Figure 9 b), can be proposed for Bi 2 WO 6 –TiO 2 -N similarly to other systems [ 55 , 56 , 57 ]. Therefore, this junction can promote a removal of photogenerated holes from the nitrogen energy levels and suppress the degradation of nitrogen impurities by these holes.…”
Section: Resultsmentioning
confidence: 99%