Synthesis and characterization of the quaternary nanocomposite based on TiO2/CdS/rGO/Pt and its application in the photoreduction of CO2 to methane under visible light

Andreia Morais^a, João Eduardo Benedetti^a, Douglas Bernardo^a, Ana Flavia Nogueira^a

^aUniversity of Campinas - UNICAMP, Cidade Universitária Zeferino Vaz, Campinas, 13083, Brazil

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Douglas Bernardo, 419
Publication date: 5th February 2015

Together we are stronger’. The preparation of the quaternary TiO₂/CdS/rGO/Pt nanocomposite is reported herein along with its application, for the first time, as a catalyst for the photocatalytic reduction of carbon dioxide (CO₂) to methane (CH₄). TiO₂/CdS nanoparticles and Pt nanoparticle-decorated reduced graphene oxide sheets (rGO/Pt) were synthesized separately and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electronic microscopy (HR-TEM), Raman, UV-vis and photoelectrochemical experiments. Samples of the hydrocarbons were collected and analyzed by gas chromatography (GC). After 5 hours of illumination under visible light, 0.11 µmol of CH₄ was produced at an average production rate of 0.0867 mmol/hour, higher than the production measured for the TiO₂/CdS and the TiO₂/CdS/Pt control samples. Photoelectrochemistry experiments confirm that the presence of rGO (reduced graphene oxide) sheets in the nanocomposite enhanced the electrochemical and the photocatalytical properties because of a fast electron transport and the inhibition of charge recombination.
Schematic illustration of the photoinduced charge separation and transfer process in the TiO2/CdS/rGO/Pt quaternary nanocomposite.
Peng, G.; Jincheng, L.; Drren, D, S.; Graphene oxide–CdS composite with high photocatalytic degradation and disinfection activities under visible light irradiation Environ. Sci. Technol., 2009, 43, 7079-7085. Kazuhiko, M.; Kentaro, T.; Daling, Lu.; Tsuyoshi T.; Nobuo S.; Yasunobu I.; and Kazunari D.; Photocatalyst releasing hydrogen from water. Nature., 2006, 440, 295.

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