Enriching surface-ordered defects on WO3 for photocatalytic CO2-to-CH4 conversion by water.
Proc Natl Acad Sci U S A
; 121(18): e2319751121, 2024 Apr 30.
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| ID: mdl-38662548
ABSTRACT
Defect engineering has been widely applied in semiconductors to improve photocatalytic properties by altering the surface structures. This study is about the transformation of inactive WO3 nanosheets to a highly effective CO2-to-CH4 conversion photocatalyst by introducing surface-ordered defects in abundance. The nonstoichiometric WO3-x samples were examined by using aberration-corrected electron microscopy. Results unveil abundant surface-ordered terminations derived from the periodic {013} stacking faults with a defect density of 20.2%. The {002} surface-ordered line defects are the active sites for fixation CO2, transforming the inactive WO3 nanosheets into a highly active catalyst (CH4 O2 = 8.2 16.7 µmol h-1). We believe that the formation of the W-O-C-W-O species is a critical step in the catalytic pathways. This work provides an atomic-level comprehension of the structural defects of catalysts for activating small molecules.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Año:
2024
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Article