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- Publisher Website: 10.1016/j.carbon.2021.04.030
- Scopus: eid_2-s2.0-85104459520
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Article: Salt-air template synthesis of Na and O doped porous graphitic carbon nitride nanorods with exceptional photocatalytic H2 evolution activity
Title | Salt-air template synthesis of Na and O doped porous graphitic carbon nitride nanorods with exceptional photocatalytic H2 evolution activity |
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Authors | |
Keywords | Charge trapping Graphitic carbon nitride Nanorods Oxygen doping Sodium salt |
Issue Date | 2021 |
Publisher | Elsevier Ltd.. The Journal's web site is located at http://www.elsevier.com/locate/carbon |
Citation | Carbon, 2021, v. 179, p. 42-52 How to Cite? |
Abstract | Photocatalyst fabrication process plays the central role in photocatalytic hydrogen (H2) evolution reaction. Herein, we synthesize Na+ functionalized porous graphitic carbon nitride nanorods (Na-CNNR) via a facile one-pot calcination method. The morphology and size of Na-CNNR are controllable by changing the amount of sodium salt; both sodium salt and air are essential to the unique structure and oxygen doping. The obtained Na-CNNR contains abundant oxygen in the graphitic carbon nitride (CN) plane. The optimized Na20-CNNR (20 wt% Na2S2O3•5H2O to dicyanamide) photocatalyst exhibits a high surface area with enhanced visible light absorption. Besides, Na20-CNNR displays fast charge transfer and high carrier separation rate characterized by photoluminescence (PL) spectroscopy and electrochemical test. Through time-resolved transient absorption spectra analysis, the trapped unreactive electron accumulation can be highly restrained, favoring efficient active electron de-trapping and transfer. The optimized Na20-CNNR sample exhibits the highest photocatalytic H2 evolution rate of 7.46 mmol/h/g under visible light irradiation (>400 nm, 100 mW/cm2), which is up to 85 times that of the bare CN and 27 times that of Na+ doped graphitic carbon nitride nanoparticles (Na20–CNNP). Meanwhile, the cyclability tests indicate that Na20-CNNR displays robust stability over 24 h. |
Persistent Identifier | http://hdl.handle.net/10722/314873 |
ISSN | 2023 Impact Factor: 10.5 2023 SCImago Journal Rankings: 2.171 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | ZHAO, X | - |
dc.contributor.author | ZHANG, Y | - |
dc.contributor.author | LI, F | - |
dc.contributor.author | Wang, Y | - |
dc.contributor.author | Pan, W | - |
dc.contributor.author | Leung, YCD | - |
dc.date.accessioned | 2022-08-05T09:36:08Z | - |
dc.date.available | 2022-08-05T09:36:08Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Carbon, 2021, v. 179, p. 42-52 | - |
dc.identifier.issn | 0008-6223 | - |
dc.identifier.uri | http://hdl.handle.net/10722/314873 | - |
dc.description.abstract | Photocatalyst fabrication process plays the central role in photocatalytic hydrogen (H2) evolution reaction. Herein, we synthesize Na+ functionalized porous graphitic carbon nitride nanorods (Na-CNNR) via a facile one-pot calcination method. The morphology and size of Na-CNNR are controllable by changing the amount of sodium salt; both sodium salt and air are essential to the unique structure and oxygen doping. The obtained Na-CNNR contains abundant oxygen in the graphitic carbon nitride (CN) plane. The optimized Na20-CNNR (20 wt% Na2S2O3•5H2O to dicyanamide) photocatalyst exhibits a high surface area with enhanced visible light absorption. Besides, Na20-CNNR displays fast charge transfer and high carrier separation rate characterized by photoluminescence (PL) spectroscopy and electrochemical test. Through time-resolved transient absorption spectra analysis, the trapped unreactive electron accumulation can be highly restrained, favoring efficient active electron de-trapping and transfer. The optimized Na20-CNNR sample exhibits the highest photocatalytic H2 evolution rate of 7.46 mmol/h/g under visible light irradiation (>400 nm, 100 mW/cm2), which is up to 85 times that of the bare CN and 27 times that of Na+ doped graphitic carbon nitride nanoparticles (Na20–CNNP). Meanwhile, the cyclability tests indicate that Na20-CNNR displays robust stability over 24 h. | - |
dc.language | eng | - |
dc.publisher | Elsevier Ltd.. The Journal's web site is located at http://www.elsevier.com/locate/carbon | - |
dc.relation.ispartof | Carbon | - |
dc.subject | Charge trapping | - |
dc.subject | Graphitic carbon nitride | - |
dc.subject | Nanorods | - |
dc.subject | Oxygen doping | - |
dc.subject | Sodium salt | - |
dc.title | Salt-air template synthesis of Na and O doped porous graphitic carbon nitride nanorods with exceptional photocatalytic H2 evolution activity | - |
dc.type | Article | - |
dc.identifier.email | Pan, W: wdpan21@hku.hk | - |
dc.identifier.email | Leung, YCD: ycleung@hku.hk | - |
dc.identifier.authority | Leung, YCD=rp00149 | - |
dc.identifier.doi | 10.1016/j.carbon.2021.04.030 | - |
dc.identifier.scopus | eid_2-s2.0-85104459520 | - |
dc.identifier.hkuros | 335282 | - |
dc.identifier.volume | 179 | - |
dc.identifier.spage | 42 | - |
dc.identifier.epage | 52 | - |
dc.identifier.isi | WOS:000661625400006 | - |
dc.publisher.place | Netherlands | - |