Efficient Photocatalytic Overall Water Splitting Induced by the Giant Internal Electric Field of a g-C<sub>3</sub> N<sub>4</sub> /rGO/PDIP Z-Scheme Heterojunction.
basic_science · Level V
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- Record sourced from PubMed, PMID 33448048.
- Also identified by DOI 10.1002/adma.202007479.
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Abstract
A graphitic carbon nitride/rGO/perylene diimide polymer (g-C<sub>3</sub> N<sub>4</sub> /rGO/PDIP) Z-scheme heterojunction is successfully constructed to realize high-flux charge transfer and efficient photocatalytic overall water splitting. A giant internal electric field in the Z-scheme junction is built, enabling the charge separation efficiency to be enhanced dramatically by 8.5 times. Thus, g-C<sub>3</sub> N<sub>4</sub> /rGO/PDIP presents an efficient and stable photocatalytic overall water splitting activity with H<sub>2</sub> and O<sub>2</sub> evolution rate of 15.80 and 7.80 µmol h<sup>-1</sup> , respectively, ≈12.1 times higher than g-C<sub>3</sub> N<sub>4</sub> nanosheets. Meanwhile, a notable quantum efficiency of 4.94% at 420 nm and solar-to-hydrogen energy-conversion efficiency of 0.30% are achieved, prominently surpassing many reported g-C<sub>3</sub> N<sub>4</sub> -based photocatalysts. Briefly, this work throws light on enhancing the internal electric field by interface control to dramatically improve the photocatalytic performance.