Edge Dislocations Induce Improved Photocatalytic Efficiency of Colored TiO 2

Ren, Peng; Song, Miao; Lee, Jaewon; Zheng, Jian; Lu, Zexi; Engelhard, Mark; Yang, Xiuchun; Li, Xiaolin; Kisailus, David; Li, Dongsheng

doi:10.1002/admi.201901121

Title: Edge Dislocations Induce Improved Photocatalytic Efficiency of Colored TiO ₂

Journal Article · 13 August 2019 · Advanced Materials Interfaces

DOI: https://doi.org/10.1002/admi.201901121 · OSTI ID:1557017

Ren, Peng ^[1]; Song, Miao ^[2]; Lee, Jaewon ^[2]; Zheng, Jian ^[2]; Lu, Zexi ^[2]; Engelhard, Mark ^[3]; Yang, Xiuchun ^[4]; Li, Xiaolin ^[5]; Kisailus, David ^[6];

^[2]

Physical and Computational Sciences Directorate Pacific Northwest National Laboratory Richland WA 99352 USA, School of Materials Science and Engineering Tongji University Shanghai 201804 China
Physical and Computational Sciences Directorate Pacific Northwest National Laboratory Richland WA 99352 USA
Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory Richland WA 99352 USA
School of Materials Science and Engineering Tongji University Shanghai 201804 China
Energy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99352 USA
Department of Chemical and Environmental Engineering University of California Riverside CA 92507 USA, Materials Science and Engineering University of California Riverside CA 92507 USA

Abstract Titanium oxide is the most widely used material for photocatalytic applications due to its low cost and environmental friendliness. One of the grand challenges to improve its energy conversion efficiency is to utilize more visible light while inhibiting the recombination of photogenerated electrons and holes. A one‐step hydrosolvothermal method is used to obtain colored ultrafine nanowires of rutile and nanoparticles of anatase with edge dislocations, which induce broadened visible solar absorption (400–900 nm) and improve photocatalytic efficiency up to 1.8 times that of rutile or anatase without defects. Enhanced photocatalytic activity of these structures is demonstrated by photodegrading methylene blue measurements under simulated solar light irradiation. Results show the existence of Ti ³⁺ , induced by edge dislocations, and subsequent electronic band structure–property relationships. This work highlights a strategy for generating sufficient desired defects in TiO ₂ nanostructures, leading to broadened visible solar absorption and improved photocatalytic efficiency under visible light irradiation.

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Sponsoring Organization:: USDOE

OSTI ID:: 1557017

Journal Information:: Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 17 Vol. 6; ISSN 2196-7350

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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