Journal
ADVANCED MATERIALS
Volume 33, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202100407
Keywords
amorphous domains; black titanium dioxide; defect engineering; oxygen vacancies
Categories
Funding
- National Natural Science Foundation of China [51532001, 11974037, 52002010, U1930402]
- Beijing Natural Science Foundation [2194077]
- National Postdoctoral Program for Innovative Talents [BX20180020]
- China Postdoctoral Science Foundation [2018M640041]
- Royal Society Newton Advanced Fellowship scheme [NAF\R1\180242]
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By constructing amorphous domains, researchers have successfully achieved a regional dual structure in TiO2 materials with anisotropic oxygen vacancies, resulting in superior catalytic activity in degrading RhB solutions.
Although oxygen vacancies (O(v)s) play a critical role for many applications of metal oxides, a controllable synthetic strategy for anisotropic O(v)s remains a great challenge. Here, a novel strategy is proposed to achieve the regional dual structure with anisotropic O(v)s 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 O(v)s in TiO2 are energetically favored, resulting in the formation of amorphous domains in the interior region via diffusion of surface-formed O(v)s into the subsurface. The stable O-v-induced amorphous domains in TiO2 with enhanced catalytic performances provide a scalable strategy to practical O-v engineering in functional metal oxides.
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