TY - JOUR
T1 - Black titanium dioxide nanocolloids by laser irradiation in liquids for visible light photo-catalytic/electrochemical applications
AU - Raveendran Nair, Pooja
AU - Rosa Santiago Ramirez, Claudia
AU - Angel Gracia Pinilla, Miguel
AU - Krishnan, Bindu
AU - Avellaneda Avellaneda, David
AU - Fabian Cienfuegos Pelaes, Rene
AU - Shaji, Sadasivan
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/6/30
Y1 - 2023/6/30
N2 - The discovery of defect induced TiO2 nanoparticles with enhanced visible light absorption has sparked an outburst of interest for visible energy applications. Here we report the formation of black titanium dioxide (BTO) nanoparticles in de-ionized water (DW), isopropyl alcohol (IPA) and DW-IPA mixture (1:1) using pulsed laser irradiation in liquids. X-ray diffraction showed the transformation of the major anatase phase in WTO (white TiO2) to rutile for BTO by irradiation. The presence of these phases was further confirmed by Raman spectroscopy. Transmission electron microscopy (TEM) was utilized for the morphology and structural confirmation. Scanning electron microscopy (SEM) showed the existence of nanoparticles with mixed shapes and sizes. X-ray photoelectron spectroscopy (XPS) acquired information on the chemical states present as well as elemental composition where shifts in Ti 2p as well as O 1s peaks are observed for BTO. Reduced bandgap and enhanced visible light absorption are observed in BTO by diffuse reflectance spectroscopy (DRS). Photocatalytic degradation studies showed superior organic dye decay activity under visible light for BTO. Photoelectrocatalytic activity of BTO films in neutral pH showed selectivity for oxygen evolution reaction (OER). These results show a facile fabrication of defect rich metal oxide nanomaterials with enhanced visible light activity.
AB - The discovery of defect induced TiO2 nanoparticles with enhanced visible light absorption has sparked an outburst of interest for visible energy applications. Here we report the formation of black titanium dioxide (BTO) nanoparticles in de-ionized water (DW), isopropyl alcohol (IPA) and DW-IPA mixture (1:1) using pulsed laser irradiation in liquids. X-ray diffraction showed the transformation of the major anatase phase in WTO (white TiO2) to rutile for BTO by irradiation. The presence of these phases was further confirmed by Raman spectroscopy. Transmission electron microscopy (TEM) was utilized for the morphology and structural confirmation. Scanning electron microscopy (SEM) showed the existence of nanoparticles with mixed shapes and sizes. X-ray photoelectron spectroscopy (XPS) acquired information on the chemical states present as well as elemental composition where shifts in Ti 2p as well as O 1s peaks are observed for BTO. Reduced bandgap and enhanced visible light absorption are observed in BTO by diffuse reflectance spectroscopy (DRS). Photocatalytic degradation studies showed superior organic dye decay activity under visible light for BTO. Photoelectrocatalytic activity of BTO films in neutral pH showed selectivity for oxygen evolution reaction (OER). These results show a facile fabrication of defect rich metal oxide nanomaterials with enhanced visible light activity.
KW - n/a OA procedure
KW - Defect rich titania
KW - Photoelectrochemistry
KW - Pulsed laser irradiation in liquids
KW - Visible light photocatalysis
KW - Black titania
UR - http://www.scopus.com/inward/record.url?scp=85151402564&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2023.157096
DO - 10.1016/j.apsusc.2023.157096
M3 - Article
AN - SCOPUS:85151402564
SN - 0169-4332
VL - 623
JO - Applied surface science
JF - Applied surface science
M1 - 157096
ER -