TY - JOUR
T1 - Morphology-Dependent Evolutions of Sizes, Structures, and Catalytic Activity of Au Nanoparticles on Anatase TiO2 Nanocrystals
AU - Li, Dan
AU - You, Rui
AU - Yang, Min
AU - Liu, Yuanxu
AU - Qian, Kun
AU - Chen, Shilong
AU - Cao, Tian
AU - Zhang, Zhenhua
AU - Tian, Jie
AU - Huang, Weixin
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/4/25
Y1 - 2019/4/25
N2 - Au nanoparticles with different loadings were prepared on anatase TiO2 nanocrystals with various morphologies predominantly exposing {001} facets (denoted as TiO2{001}), {100} facets (denoted as TiO2{100}) and {101} facets (denoted as TiO2{001}) by the deposition-precipitation method. Sizes, structures, and catalytic activity in lowerature CO oxidation of the resulting Au/TiO2 catalysts were comprehensively characterized. Nucleation, growth, and agglomeration of Au particles on TiO2 supports were observed to depend on TiO2 morphologies due to the morphology-dependent defect structures of TiO2 nanocrystals and subsequent Au-TiO2 interactions. Au particles mainly homogeneously nucleate and grow on these three TiO2 nanocrystals with Au loadings of 0.2-1%. With the increase in Au loadings to 2 and 5%, Au particles mainly agglomerate on TiO2{001}, mainly homogeneously nucleate and grow on TiO2{100}, and both nucleate and grow and slightly agglomerate on TiO2{101}. The electronic effect of supported Au particles on CO adsorption was observed, in which fine Au nanoparticles with electronic structures deviating from that of bulk Au exhibit a decreased adsorption capacity of CO. Meanwhile, fine Au nanoparticles are less able to activate surface lattice oxygen at the Au-TiO2 perimeters than large Au nanoparticles and exhibit a lowered intrinsic catalytic activity in lowerature CO oxidation. These results nicely exemplify morphology-dependent metal-oxide interactions and catalysis.
AB - Au nanoparticles with different loadings were prepared on anatase TiO2 nanocrystals with various morphologies predominantly exposing {001} facets (denoted as TiO2{001}), {100} facets (denoted as TiO2{100}) and {101} facets (denoted as TiO2{001}) by the deposition-precipitation method. Sizes, structures, and catalytic activity in lowerature CO oxidation of the resulting Au/TiO2 catalysts were comprehensively characterized. Nucleation, growth, and agglomeration of Au particles on TiO2 supports were observed to depend on TiO2 morphologies due to the morphology-dependent defect structures of TiO2 nanocrystals and subsequent Au-TiO2 interactions. Au particles mainly homogeneously nucleate and grow on these three TiO2 nanocrystals with Au loadings of 0.2-1%. With the increase in Au loadings to 2 and 5%, Au particles mainly agglomerate on TiO2{001}, mainly homogeneously nucleate and grow on TiO2{100}, and both nucleate and grow and slightly agglomerate on TiO2{101}. The electronic effect of supported Au particles on CO adsorption was observed, in which fine Au nanoparticles with electronic structures deviating from that of bulk Au exhibit a decreased adsorption capacity of CO. Meanwhile, fine Au nanoparticles are less able to activate surface lattice oxygen at the Au-TiO2 perimeters than large Au nanoparticles and exhibit a lowered intrinsic catalytic activity in lowerature CO oxidation. These results nicely exemplify morphology-dependent metal-oxide interactions and catalysis.
UR - https://www.scopus.com/pages/publications/85065077405
U2 - 10.1021/acs.jpcc.9b00262
DO - 10.1021/acs.jpcc.9b00262
M3 - 文章
AN - SCOPUS:85065077405
SN - 1932-7447
VL - 123
SP - 10367
EP - 10376
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 16
ER -