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Title: Delicate manipulation of cobalt oxide nanodot clusterization on binder-free TiO₂-nanorod photoanodes for efficient photoelectrochemical catalysis
Authors: Feng, Han
Liang, Liangliang
Ge, Junyu
Wu, Weiyi
Huang, Zhaohong
Liu, Yu
Li, Lin
Keywords: Engineering::Environmental engineering
Issue Date: 2020
Source: Feng, H., Liang, L., Ge, J., Wu, W., Huang, Z., Liu, Y. & Li, L. (2020). Delicate manipulation of cobalt oxide nanodot clusterization on binder-free TiO₂-nanorod photoanodes for efficient photoelectrochemical catalysis. Journal of Alloys and Compounds, 820, 153139-.
Project: AEBC M060380006.70602200
Journal: Journal of Alloys and Compounds
Abstract: In this work, to probe the crucial role of photo nanosensitizer clusterization played in determining the performance of the photoelectrocatalytic process, an illustrative nano-regional heterostructure was constructed via novel in-situ loading ultra-small cobalt oxide nanodots (<3 nm) onto the surface of titanium dioxide nanorod array grown on FTO substrate. Photoelectrochemical studies showed that photocurrents of TiO2 nanorod anodes could be remarkably improved through loading with CoOx nanosensitizers, benefiting from the broadened light-responsive range and alleviated charge carrier recombination. For the first time, Förster-resonance energy transfer (FRET) assisted nanosensitizer re-excitation effect was observed. Beneficially, the lost energy through radiative-emission from TiO2 could be efficiently reutilized by adjacent CoOx, generating extra charge carriers on nanosensitizers for further improvement of photoelectrocatalytic performance. Importantly, we directly observed the strong clusterization tendency of CoOx and morphology evolution from sub-3 nm nanodots to clusters larger than 20 nm when their loading amount is slightly increased. Furthermore, photoelectrochemical (PEC) performance of photoanodes based on TiO2@CoOx hybrid structures underwent significant enhancement initially and sharp decline eventually. We reason it that the formation of large sensitizer clusters would severely block the charge carrier transfer from nanosensitizers to TiO2 nanorods and lead to exacerbated charge carrier recombination and photoelectrocatalytic performance.
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2019.153139
Schools: School of Civil and Environmental Engineering 
School of Mechanical and Aerospace Engineering 
Interdisciplinary Graduate School (IGS) 
Research Centres: Nanyang Environment and Water Research Institute 
Advanced Environmental Biotechnology Centre (AEBC) 
Rights: © 2019 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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