Ag/polydopamine nanoparticles co-decorated defective mesoporous carbon nitride nanosheets assemblies for wide spectrum response and robust photothermal-photocatalytic performance
Ag-polydopamine nanoparticles co-decorated defective mesoporous carbon nitride assembly with wide spectrum response is fabricated, which exhibits robust photothermal-photocatalytic H2 production, due to Ag-PDA not only extends the light absorption of DCN, but also forms an efficient Z-scheme charge...
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Veröffentlicht in: | Applied surface science 2022-10, Vol.598, p.153895, Article 153895 |
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Sprache: | eng |
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Zusammenfassung: | Ag-polydopamine nanoparticles co-decorated defective mesoporous carbon nitride assembly with wide spectrum response is fabricated, which exhibits robust photothermal-photocatalytic H2 production, due to Ag-PDA not only extends the light absorption of DCN, but also forms an efficient Z-scheme charge transfer path with DCN, enabling fast electron transfer.
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•Ag-polydopamine nanoparticles co-decorated defective mesoporous carbon nitride assemblies are fabricated.•Ag-polydopamine nanoparticles co-decorated promote efficient charge transfer.•Small-sized Ag nanoparticles as efficient cocatalysts enables efficient charge separation.•Ag-polydopamine extends photoabsorption and produces obvious photothermal effect to improve catalyze activity.•The formation of Z-scheme charge transfer mechanism favors spatial charge separation.
Ag-polydopamine nanoparticles co-decorated defective mesoporous carbon nitride nanosheets assemblies (Ag-PDA/DCN) with wide spectrum responseare fabricated. The Ag-PDA/DCN assemblies exhibit excellent photocatalytic hydrogen production performance. The visible light and near-infrared light driven photocatalytic hydrogen evolution rate is up to 3840 μmol h−1 g−1, which is 20 and 7 times higher than those of DCN and PDA/DCN, respectively. This is mainly because the Ag-polydopamine nanoparticles not only form an efficient carrier transport path and realize fast electron transport, but also further extend the photoresponse of DCN, resulting in an obvious photothermal effect to further improve the photocatalytic activity. More importantly, the formed Ag nanoparticles by the low-temperature photodeposition method is smaller in size and better in dispersibility. Ag nanoparticles act as a co-catalyst in Ag-PDA/DCN, which can effectively separate the spatially photogenerated charge carriers. Compared to three systems with different Ag decoration positions, Ag-PDA/DCN with Z-scheme charge transfer mechanism is more favorable for promoting photocatalytic performance. This co-decorated strategy provides a new idea for developing low-cost Pt-free photocatalysts for solar energy conversion. |
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ISSN: | 0169-4332 1873-5584 |
DOI: | 10.1016/j.apsusc.2022.153895 |