Edge Dislocations Induce Improved Photocatalytic Efficiency of Colored TiO2

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

doi:10.1002/admi.201901121

Title: Edge Dislocations Induce Improved Photocatalytic Efficiency of Colored TiO2

Journal Article · Fri Sep 06 00:00:00 EDT 2019 · Advanced Materials Interfaces

DOI:https://doi.org/10.1002/admi.201901121· OSTI ID:1572485

Ren, Peng ^[1]; Song, Miao ^[2]; Lee, Jaewon ^[2];

^[2]; Lu, Zexi ^[2];

^[2]; Yang, Xiuchun ^[3]; Li, Xiaolin ^[2]; Kisailus, David ^[4];

^[2]

UNIVERSITY PROGRAMS
BATTELLE (PACIFIC NW LAB)
Tongji University
University of California, Riverside

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 photo-generated electrons and holes. We use a one-step hydro-solvothermal method to obtain colored ultra-fine nanowires of rutile and nanoparticles of anatase with edge dislocations, which induced broadened visible solar absorption (400-900 nm) and improved 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 Ti3+, induced by edge dislocations, and subsequent electronic band structure-property relationships. This work highlights a strategy for generating sufficient desired defects in TiO2 nanostructures, leading to broadened visible solar absorption and improved photocatalytic efficiency under visible light irradiation.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1572485

Report Number(s):: PNNL-SA-145888

Journal Information:: Advanced Materials Interfaces, Vol. 6, Issue 17

Country of Publication:: United States

Language:: English

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