Spatial Heterojunction in Nanostructured TiO<sub>2</sub> and Its Cascade Effect for Efficient Photocatalysis.
basic_science · Level V
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- Record sourced from PubMed, PMID 32343586.
- Also identified by DOI 10.1021/acs.nanolett.9b05121.
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Abstract
A highly efficient photoenergy conversion is strongly dependent on the cumulative cascade efficiency of the photogenerated carriers. Spatial heterojunctions are critical to directed charge transfer and, thus, attractive but still a challenge. Here, a spatially ternary titanium-defected TiO<sub>2</sub>@carbon quantum dots@reduced graphene oxide (denoted as <i>V</i><sub>Ti</sub>@CQDs@rGO) in one system is shown to demonstrate a cascade effect of charges and significant performances regarding the photocurrent, the apparent quantum yield, and photocatalysis such as H<sub>2</sub> production from water splitting and CO<sub>2</sub> reduction. A key aspect in the construction is the technologically irrational junction of Ti-vacancies and nanocarbons for the spatially inside-out heterojunction. The new "spatial heterojunctions" concept, characteristics, mechanism, and extension are proposed at an atomic-/nanoscale to clarify the generation of rational heterojunctions as well as the cascade electron transfer.