TY - JOUR
T1 - Porous Fe2O3 nanotubes with Α-Γ phase junction for enhanced charge separation and photocatalytic property produced by molecular layer deposition
AU - Chen, Chaoqiu
AU - Duan, Feifei
AU - Zhao, Shichao
AU - Wang, Weike
AU - Yang, Fan
AU - Nuansing, Wiwat
AU - Zhang, Baiyan
AU - Qin, Yong
AU - Knez, Mato
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/7/5
Y1 - 2019/7/5
N2 - Constructing nanotubular morphologies and heterojunctions are two effective strategies to enhance the charge separation and transport of α-Fe2O3 for improved photocatalytic performance, while the fabrication of porous α-Fe2O3 nanotubes with precisely tailored wall thickness, pore structure, crystallinity, and junctions still remains a big challenge. Herein, two novel molecular layer deposition (MLD) procedures are designed to prepare porous Fe2O3 nanotubes with tunable pore structure and phase junction. The organic fractions of the obtained Fe-hybrid MLD films not only act as soft templates to generate nanopores in nanotube walls but also play a key role in the formation of phase-junction. The porous structure and phase-junction significantly improve the mass diffusion and charge separation efficiency of Fe2O3 nanotubes, leading to a drastically increased photocatalytic activity for photo-Fenton reaction. Especially, the porous α-γ Fe2O3 nanotubes produced by two-step AB MLD from iron tert-butoxide and ethylene glycol exhibit the highest photocatalytic activity, which is more than a 6.5-fold and 20-fold improvement compared with the nonporous pure α-Fe2O3 nanotubes and commercial α-Fe2O3 nanoparticles, respectively. The MLD method provides a new bottom-up approach to develop efficient Fe2O3 based heterostructure porous photocatalysts for waste-water cleaning and water splitting.
AB - Constructing nanotubular morphologies and heterojunctions are two effective strategies to enhance the charge separation and transport of α-Fe2O3 for improved photocatalytic performance, while the fabrication of porous α-Fe2O3 nanotubes with precisely tailored wall thickness, pore structure, crystallinity, and junctions still remains a big challenge. Herein, two novel molecular layer deposition (MLD) procedures are designed to prepare porous Fe2O3 nanotubes with tunable pore structure and phase junction. The organic fractions of the obtained Fe-hybrid MLD films not only act as soft templates to generate nanopores in nanotube walls but also play a key role in the formation of phase-junction. The porous structure and phase-junction significantly improve the mass diffusion and charge separation efficiency of Fe2O3 nanotubes, leading to a drastically increased photocatalytic activity for photo-Fenton reaction. Especially, the porous α-γ Fe2O3 nanotubes produced by two-step AB MLD from iron tert-butoxide and ethylene glycol exhibit the highest photocatalytic activity, which is more than a 6.5-fold and 20-fold improvement compared with the nonporous pure α-Fe2O3 nanotubes and commercial α-Fe2O3 nanoparticles, respectively. The MLD method provides a new bottom-up approach to develop efficient Fe2O3 based heterostructure porous photocatalysts for waste-water cleaning and water splitting.
KW - Charge separation
KW - Molecular layer deposition
KW - Nanoporous hematite nanotubes
KW - Phase junction
KW - Photo-Fenton reaction
UR - http://www.scopus.com/inward/record.url?scp=85061630561&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2019.02.029
DO - 10.1016/j.apcatb.2019.02.029
M3 - 文章
AN - SCOPUS:85061630561
SN - 0926-3373
VL - 248
SP - 218
EP - 225
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -