期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 284, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119704
关键词
Au nanoclusters; Photocatalytic stability; Z-scheme; Visible light; Amines oxidation
资金
- National Natural Science Foundation of China [21671176]
- Post-doctoral Foundation of Henan Province
This research successfully improved the photo-oxidation activity and stability of gold nanoclusters using a Z-scheme AuNC/ultrathin BiOCl nanosheets heterojunction, achieving efficient oxidation reactions of amine compounds. Furthermore, the heterojunction demonstrated stability and enhanced photocatalytic activity.
Atomically precise gold nanoclusters have received increasing attention in photocatalysis but suffered from self-oxidation coalescence induced by photo-generated holes. Herein, we report an efficient charge engineering strategy to improve the photo-oxidation activity and stability of Au-25(PPh3)(10)(SC3H6Si(OC2H5)(3))(5)Cl-2 nanocluster (AuNC) taking advantage of Z-scheme AuNC/ultrathin BiOCl nanosheets (2D-BiOCl) heterojunction for visible light oxidative self-coupling of amines. The turnover frequency (TOF) over AuNC/2D-BiOCl for benzylamine can reach 1916 h(-1), much higher than that of most previously reported gold catalysts with a TOF usually less than 500 h(-1). Moreover, the heterojunction can be stabilized for six cycles with the intact structure of AuNC remained. The enhanced photocatalytic activity of AuNC/2D-BiOCl was predominantly attributed to the formation of Z-scheme heterojunction, which effectively accelerated the transfer and separation of photo-generated carriers. Especially, the consumption of holes in AuNC by injected electrons from 2D-BiOCl can inhibit the self-oxidation of AuNC, thus improve its stability. This study provides some insights into the design of metal nanocluster catalysts with Z-scheme charge transfer for the application of photocatalysis.
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