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Title: Transitional Structures with Continuous Variations in Atomic Positions from Anatase to Rutile Improve Photocatalytic Activity

Journal Article · · Advanced Materials Interfaces

TiO2 polymorphs have distinct properties that are widely employed in various applications. However, mechanisms of transformations between these polymorphs are not fully understood, especially at atomic scale, inhibiting advancing the design and application of the transitional phases. Here, based on results from semi-in situ transmission electron microscopy, density functional theory, and X-ray photoemission experiments, a physical picture of transitional structures is discovered, in which continuous variations in atomic positions form along a previously unreported anatase-to-rutile phase transformation path of [010]A–to–[$$\bar{1}\bar{1}1$$]R and (004)A–to– (011)R. These gradient structures give rise to continuous band bending, which promotes electron-hole separation and inhibits their recombination across the bulk of the particles, leading to a large functionally active volume fraction and resulting in high photoactivity. These findings suggest that interphase matter based on extended gradient structures can be designed to advance new functions not achievable using abrupt interfaces.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Energy Research Scientific Computing Center (NERSC); USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE
Grant/Contract Number:
AC05-76RL01830; KC0203020:67037; 78705; AC02-05CH11231; BES-ERCAP0024562; BES-ERCAP0021864
OSTI ID:
1973286
Alternate ID(s):
OSTI ID: 1983482; OSTI ID: 1995238
Report Number(s):
PNNL-SA-165318
Journal Information:
Advanced Materials Interfaces, Vol. 10, Issue 17; ISSN 2196-7350
Publisher:
Wiley-VCHCopyright Statement
Country of Publication:
United States
Language:
English

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