@article{Quan:2023:10.1016/j.jphotochem.2023.114889,
author = {Quan, Y and YiO, MHN and Li, Y and Myers, RJ and Kafizas, A},
doi = {10.1016/j.jphotochem.2023.114889},
journal = {Journal of Photochemistry and Photobiology A: Chemistry},
title = {Influence of Bi co-catalyst particle size on the photocatalytic activity of BiOI microflowers in Bi/BiOI junctions - a mechanistic study of charge carrier behaviour},
url = {http://dx.doi.org/10.1016/j.jphotochem.2023.114889},
volume = {443},
year = {2023}
}

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TY  - JOUR
AB  - Herein, we investigate the effect of Bi particle size in BiOI/Bi junctions on their photocatalytic function towards NO gas. BiOI microflowers (BiOI) and BiOI microflowers decorated with micron-sized Bi particles (BiOI/Bi MPs) were produced by a solvothermal method. BiOI decorated with nano-sized Bi particles (BiOI/Bi NPs) were produced by a reduction process. All samples were physically characterised by XRD, FT-IR, SEM, HR-TEM coupled with EDX analysis, DR-UV–visible and PL spectroscopy and functionally characterised by photocatalytic testing towards NO gas, TAS and EPR spectroscopy.Their photocatalytic activity towards NO gas was measured following ISO protocol (ISO 22197–1:2016). The best performing BiOI-based sample was BiOI/Bi NPs, showing NO and NOx conversion efficiencies of ∼33 and ∼11% under UVA light, and ∼26 and ∼8.1% under visible light, respectively. The BiOI and BiOI/Bi MPs samples showed significantly lower activities, displaying overall NOx conversion efficiencies of ∼3.5 and ∼0.8% under UVA light, respectively. Importantly, the best performing BiOI/Bi NPs samples showed visible light activity that was at least 6 times higher than that of a commercial TiO2 benchmark (CristalACTiVTM PC-S7). TAS measurements showed that charge carriers were significantly longer lived in the BiOI/Bi NPs sample (t50% from 10 μs of ∼90 μs) than the BiOI and BiOI/Bi MPs samples (t50% from 10 μs of ∼50 μs). This was attributed to the significant degree of interfacial contact formed between Bi and BiOI in the BiOI/Bi NPs sample, which enhanced charge carrier separation. EPR studies showed that this interfacial contact between BiOI and Bi likely promoted the formation of VO, which may have contributed to enhancement seen in photocatalytic activity in the BiOI/Bi junction.
AU  - Quan,Y
AU  - YiO,MHN
AU  - Li,Y
AU  - Myers,RJ
AU  - Kafizas,A
DO  - 10.1016/j.jphotochem.2023.114889
PY  - 2023///
SN  - 1010-6030
TI  - Influence of Bi co-catalyst particle size on the photocatalytic activity of BiOI microflowers in Bi/BiOI junctions - a mechanistic study of charge carrier behaviour
T2  - Journal of Photochemistry and Photobiology A: Chemistry
UR  - http://dx.doi.org/10.1016/j.jphotochem.2023.114889
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:001018885000001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
UR  - https://doi.org/10.1016/j.jphotochem.2023.114889
UR  - http://hdl.handle.net/10044/1/107836
VL  - 443
ER  - 

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