| Alternative title | Enhanced charge separation in g-C3N4–BiOI heterostructures for visible light driven photoelectrochemical water splitting |
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| DOI | Resolve DOI: https://doi.org/10.1039/C8NA00264A |
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| Author | Search for: Alam, Kazi M.; Search for: Kumar, Pawan; Search for: Kar, Piyush; Search for: Thakur, Ujwal K.; Search for: Zeng, Sheng; Search for: Cui, Kai1; Search for: Shankar, Karthik |
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| Affiliation | - National Research Council of Canada. Nanotechnology
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| Format | Text, Article |
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| Abstract | 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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| Publication date | 2019-01-07 |
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| Publisher | Royal Society of Chemistry |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRC-NANO-41 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 7d09535e-0e71-454b-83a2-6328e7470a6d |
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| Record created | 2019-11-13 |
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| Record modified | 2020-03-16 |
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