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Size-dependent activity and selectivity of carbon dioxide photocatalytic reduction over platinum nanoparticles.

Abstract：

:Platinum nanoparticles (Pt NPs) are one of the most efficient cocatalysts in photocatalysis, and their size determines the activity and the selectivity of the catalytic reaction. Nevertheless, an in-depth understanding of the platinum's size effect in the carbon dioxide photocatalytic reduction is still lacking. Through analyses of the geometric features and electronic properties with variable-sized Pt NPs, here we show a prominent size effect of Pt NPs in both the activity and selectivity of carbon dioxide photocatalytic reduction. Decreasing the size of Pt NPs promotes the charge transfer efficiency, and thus enhances both the carbon dioxide photocatalytic reduction and hydrogen evolution reaction (HER) activity, but leads to higher selectivity towards hydrogen over methane. Combining experimental results and theoretical calculations, in Pt NPs, the terrace sites are revealed as the active sites for methane generation; meanwhile, the low-coordinated sites are more favorable in the competing HER.

journal_name

Nat Commun

journal_title

Nature communications

authors

Dong C,Lian C,Hu S,Deng Z,Gong J,Li M,Liu H,Xing M,Zhang J

doi

10.1038/s41467-018-03666-2

subject

Has Abstract

pub_date

2018-03-28 00:00:00

pages

1252

issue

1

issn

2041-1723

pii

10.1038/s41467-018-03666-2

journal_volume

9

pub_type

杂志文章

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