Amorphous Domains in Black Titanium Dioxide

Although oxygen vacancies (Ovs) play a critical role for many applications of metal oxides, a controllable synthetic strategy for anisotropic Ovs remains a great challenge. Here, a novel strategy is proposed to achieve the regional dual structure with anisotropic Ovs at both the surface and in the i...

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Bibliographic Details
Published in:Advanced materials (Weinheim) Vol. 33; no. 23; pp. e2100407 - n/a
Main Authors: Kang, Jianxin, Zhang, Yan, Chai, Ziwei, Qiu, Xiaoyi, Cao, Xingzhong, Zhang, Peng, Teobaldi, Gilberto, Liu, Li‐Min, Guo, Lin
Format: Journal Article
Language:English
Published: Germany Wiley Subscription Services, Inc 01.06.2021
Subjects:
amorphous domains
black titanium dioxide
defect engineering
Domains
Materials science
Metal oxides
oxygen vacancies
Rhodamine
Titanium
Titanium dioxide
amorphous domains
defect engineering
black titanium dioxide
oxygen vacancies
ISSN:0935-9648, 1521-4095, 1521-4095
Online Access:Get full text
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Summary:Although oxygen vacancies (Ovs) play a critical role for many applications of metal oxides, a controllable synthetic strategy for anisotropic Ovs remains a great challenge. Here, a novel strategy is proposed to achieve the regional dual structure with anisotropic Ovs at both the surface and in the interior of TiO2 by constructing amorphous domains. The as‐prepared black TiO2 with amorphous domains exhibits superior activity in degrading rhodamine B (RhB) solutions, which can instantly decompose RhB with just a shake. First‐principle simulations reveal that subsurface Ovs in TiO2 are energetically favored, resulting in the formation of amorphous domains in the interior region via diffusion of surface‐formed Ovs into the subsurface. The stable Ov‐induced amorphous domains in TiO2 with enhanced catalytic performances provide a scalable strategy to practical Ov engineering in functional metal oxides. Benefiting from the diffusion of oxygen vacancies from the surface to inside, the regional dual structure with anisotropic oxygen vacancies at both the surface and in the interior of TiO2 is obtained by constructing amorphous domains. The as‐prepared sample exhibits superior catalytic activity, which can immediately degrade rhodamine B solution to colorless with a shake.
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ISSN:0935-9648
1521-4095
1521-4095
DOI:10.1002/adma.202100407