Premium
Oxygen‐Vacancy‐Mediated Photocatalysis over Bi 2 Sn 2 O 7 : Exceptional Catalytic Activity and Selectivity
Author(s) -
Huang Shushu,
Kou Xin,
He Dan,
Du Chunfang,
Wang Xiaojing,
Su Yiguo
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201900454
Subject(s) - benzyl alcohol , photocatalysis , selectivity , oxygen , benzaldehyde , valence (chemistry) , photochemistry , catalysis , chemistry , tin , adsorption , vacancy defect , electronic structure , materials science , computational chemistry , organic chemistry , crystallography
Abstract A series of Bi 2 Sn 2 O 7 photocatalysts was developed with the aim to regulate defect chemistry as well as electronic structure by modulating the charge states of tin species for boosting photocatalytic selective oxidation of alcohols performance. Defective centers, such as oxygen vacancies (OVs), were beneficial to enhancing the adsorption and activation of molecular oxygen. Meanwhile, the valence band edge potential of Bi 2 Sn 2 O 7 with higher OVs content exhibited a distinct downshift, improving the thermodynamical driving force of photooxidation. Additionally, OVs contributed to promoting the separation efficiency of photogenerated carriers, which can be confirmed by the surface photovoltage measurement. By optimizing the electronic structure as well as defect chemistry, the optimal benzyl alcohol conversion efficiency was 76.0 % with selectivity toward benzaldehyde being about 100 %. It's found that photogenerated holes and . O 2 − active species played critical role in photocatalytic aerobic oxidation. This work may provide a novel insight to clarify the role of defect chemistry during the selective benzyl alcohol oxidation over Bi 2 Sn 2 O 7 photocatalyst.