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Enhanced charge separation in g-C3N4-BiOI heterostructures for visible light driven photoelectrochemical water splitting.


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.

SUBMITTER: Alam KM 

PROVIDER: S-EPMC9419778 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Enhanced charge separation in g-C<sub>3</sub>N<sub>4</sub>-BiOI heterostructures for visible light driven photoelectrochemical water splitting.

Alam Kazi M KM   Kumar Pawan P   Kar Piyush P   Thakur Ujwal K UK   Zeng Sheng S   Cui Kai K   Shankar Karthik K  

Nanoscale advances 20190107 4


Heterojunctions of the low bandgap semiconductor bismuth oxyiodide (BiOI) with bulk multilayered graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) and few layered graphitic carbon nitride sheets (g-C<sub>3</sub>N<sub>4</sub>-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-C<sub>3</sub>N<sub>4</sub> and g-C<sub>  ...[more]

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