| Autre titre | Enhanced charge separation in g-C3N4–BiOI heterostructures for visible light driven photoelectrochemical water splitting |
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| DOI | Trouver le DOI : https://doi.org/10.1039/C8NA00264A |
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| Auteur | Rechercher : Alam, Kazi M.; Rechercher : Kumar, Pawan; Rechercher : Kar, Piyush; Rechercher : Thakur, Ujwal K.; Rechercher : Zeng, Sheng; Rechercher : Cui, Kai1; Rechercher : Shankar, Karthik |
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| Affiliation | - Conseil national de recherches du Canada. Nanotechnologie
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| Format | Texte, Article |
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| Résumé | Heterojunctions of the low bandgap semiconductor bismuth oxyiodide (BiOI) with bulk multilayered graphitic carbon nitride (g-C₃N₄) and few layered graphitic carbon nitride sheets (g-C₃N₄-S) are synthesized and investigated as an active photoanode material for sunlight driven water splitting. HR-TEM and elemental mapping reveals formation of a unique heterostructure between BiOI platelets and the carbon nitride (g-C₃N₄ and g-C₃N₄-S) network that consisted of dendritic BiOI nanoplates surrounded by g-C₃N₄ sheets. The presence of BiOI in g-C₃N₄-S/BiOI and g-C₃N₄-S/BiOI nanocomposites extends the visible light absorption profile from 500 nm up to 650 nm. Due to excellent charge separation in g-C₃N₄/BiOI and g-C₃N₄-S/BiOI, evident from quenching of the carbon nitride photoluminescence (PL) and a decrease in the PL lifetime, a significant increase in photoelectrochemical performance is observed for both types of g-C₃N₄–BiOI heterojunctions. In comparison to heterojunctions of bulk g-C₃N₄ with BiOI, the nanocomposite consisting of few layered sheets of g-C₃N₄ and BiOI exhibits higher photocurrent density due to lower recombination in few layered sheets. A synergistic trap passivation and charge separation is found to occur in the g-C₃N₄-S/BiOI nanocomposite heterostructure which results in a higher photocurrent and a lower charge transfer resistance. |
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| Date de publication | 2019-01-07 |
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| Maison d’édition | Royal Society of Chemistry |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | NRC-NANO-41 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 7d09535e-0e71-454b-83a2-6328e7470a6d |
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| Enregistrement créé | 2019-11-13 |
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| Enregistrement modifié | 2020-03-16 |
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