Efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect

Heterostructural photocatalysts with rationally aligned energy bands have been proved effective in diminishing the recombination of photo-induced excitons, thus leading to enhanced photocatalytic performance. However, the critical role of charge carrier behaviors and their quenching pathway in deter...

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Main Authors: Feng, Han, Liang, Liangliang, Liu, Yu, Huang, Zhaohong, Li, Lin
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/150544
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1505442021-06-01T03:13:16Z Efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect Feng, Han Liang, Liangliang Liu, Yu Huang, Zhaohong Li, Lin School of Civil and Environmental Engineering School of Mechanical and Aerospace Engineering Nanyang Environment and Water Research Institute Advanced Environmental Biotechnology Centre (AEBC) Singapore Institute of Manufacturing Technology Engineering::Environmental engineering Photocatalytic Site Self-quenching Heterostructural photocatalysts with rationally aligned energy bands have been proved effective in diminishing the recombination of photo-induced excitons, thus leading to enhanced photocatalytic performance. However, the critical role of charge carrier behaviors and their quenching pathway in determining the overall photocatalytic performance are still not fully explored, which severely hindered the development for efficient photocatalysts. Herein, to further explore the essential principles of photocatalysis with heterostructures, a representative nano-regional photocatalytic heterostructure was constructed through uniform decoration of visible light activable BiOI nanodots on TiO2 nanorod assembled microflowers. With which as a well-known prototype of conventional heterostructures, a possible photocatalytic performance annihilation channel via reaction site self-quenching effect in photocatalytic heterostructures was experimentally evidenced for the first time. Based on our experimental results, we evidenced that excessive decoration with BiOI nanodots would result in severe self-quenching of their photocatalytic sites through highly probable charge carrier recombination between migrating electrons along TiO2 nanorods and reactive holes in adjacent BiOI nanodots. Such fundamental and experimental discovery is not limited to the current model and would shed light on the development of novel nano-regional heterostructures with high photocatalysis performance. Nanyang Technological University We acknowledge the support from the Surface Technology Group of Singapore Institute of Manufacturing Technology including experimental and characterization equipment. We also thank the Advanced Environmental Biotechnology Centre of Nanyang Environment and Water Research Institute for the financial support (AEBC M060380006.70602200). 2021-06-01T03:13:16Z 2021-06-01T03:13:16Z 2019 Journal Article Feng, H., Liang, L., Liu, Y., Huang, Z. & Li, L. (2019). Efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect. Applied Catalysis B: Environmental, 243, 220-228. https://dx.doi.org/10.1016/j.apcatb.2018.10.045 0926-3373 0000-0002-9840-8367 https://hdl.handle.net/10356/150544 10.1016/j.apcatb.2018.10.045 2-s2.0-85055631506 243 220 228 en AEBC M060380006.70602200 Applied Catalysis B: Environmental © 2018 Elsevier B.V. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Environmental engineering
Photocatalytic Site
Self-quenching
spellingShingle Engineering::Environmental engineering
Photocatalytic Site
Self-quenching
Feng, Han
Liang, Liangliang
Liu, Yu
Huang, Zhaohong
Li, Lin
Efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect
description Heterostructural photocatalysts with rationally aligned energy bands have been proved effective in diminishing the recombination of photo-induced excitons, thus leading to enhanced photocatalytic performance. However, the critical role of charge carrier behaviors and their quenching pathway in determining the overall photocatalytic performance are still not fully explored, which severely hindered the development for efficient photocatalysts. Herein, to further explore the essential principles of photocatalysis with heterostructures, a representative nano-regional photocatalytic heterostructure was constructed through uniform decoration of visible light activable BiOI nanodots on TiO2 nanorod assembled microflowers. With which as a well-known prototype of conventional heterostructures, a possible photocatalytic performance annihilation channel via reaction site self-quenching effect in photocatalytic heterostructures was experimentally evidenced for the first time. Based on our experimental results, we evidenced that excessive decoration with BiOI nanodots would result in severe self-quenching of their photocatalytic sites through highly probable charge carrier recombination between migrating electrons along TiO2 nanorods and reactive holes in adjacent BiOI nanodots. Such fundamental and experimental discovery is not limited to the current model and would shed light on the development of novel nano-regional heterostructures with high photocatalysis performance.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Feng, Han
Liang, Liangliang
Liu, Yu
Huang, Zhaohong
Li, Lin
format Article
author Feng, Han
Liang, Liangliang
Liu, Yu
Huang, Zhaohong
Li, Lin
author_sort Feng, Han
title Efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect
title_short Efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect
title_full Efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect
title_fullStr Efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect
title_full_unstemmed Efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect
title_sort efficient nano-regional photocatalytic heterostructure design via the manipulation of reaction site self-quenching effect
publishDate 2021
url https://hdl.handle.net/10356/150544
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