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Updated: Sep 23, 2025
A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration
Published on: March 29, 2019
Photovoltaic and photocatalytic properties of bismuth oxyiodide-graphene nanocomposites
Levannie A Mabuti1, Ian Kenneth S Manding1, Candy C Mercado1
1Department of Mining, Metallurgical, and Materials Engineering, University of the Philippines Diliman 1100 Quezon City Philippines ccmercado1@up.edu.ph.
Abstract:
In this study, we evaluate the photovoltaic and photocatalytic properties of chemical vapor deposited bismuth oxyiodide (BiOI) and bismuth oxyiodide-graphene (BiOI-GR) nanocomposite thin films. The BiOI thin film has an average thickness of 574 nm and a bandgap of around 2 eV. The BiOI and BiOI-GR thin films exhibited nanoflake morphology. It was found that addition of graphene increases absorbance by causing vertical growth of nanoflakes, imparting anti-reflectance and light trapping properties. The photocatalytic activities of the thin films were evaluated by examining methylene blue (MB) degradation under visible light irradiation. BiOI-GR degraded 56.42% of MB in two hours while BiOI degraded 44.16%. Afterwards, FTO|BiOI|graphite|Al and FTO|BiOI-GR|graphite|Al solar cell devices were fabricated with photocurrent density values of 2.0 μA cm-2 and 2.7 μA cm-2, respectively. The improved properties of BiOI-GR are attributed to the anti-reflecting and light trapping properties of vertical BiOI-GR nanoflakes and the enhanced carrier separation due to graphene as an electron acceptor.
