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제125회 대한화학회 학술발표회 및 총회 Nanocavities Assisted Blue TiO2 Nanorods Integrated on Exfoliated Porous g-C3N4 Nanosheets for Enhanced Photocatalytic CO2 Conversion into Solar Fuels

2020년 2월 12일 20시 55분 00초
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Material Chemistry
저자 및
Praveen kumar Dharani, Putta Rangappa1, Amaranatha Reddy, Tae Kyu Kim*
Department of Chemistry, Yonsei University, Korea
1Chemistry, Yonsei University, Korea
The advantageous properties of two-dimensional (2D) semiconductor materials are extremely interested in photocatalytic applications, such as; huge photo reactive contact area for light absorption, the small distance concerning photogenerated charge carriers to allows them to reach the water interface vastly. Concerning this impact, the 2D graphitic carbon nitride (g-C3N4) has involved extensive interests providing a green and potential route for the photocatalytic applications due to its band gap is under visible light region. However, the photocatalytic activity of pure g-C3N4 is very low, due to their following limitation such as; low surface area, low conductivity, and poor electronic properties, it leads to fast recombination of generated charge carriers. Hence, the creation of porous nature followed by exfoliation can overcome these constraints by providing of large specific surface area and enabled quick transfer of photogenerated charge carriers onto the surface of photocatalysts, as well boosting bulk charge separation. Even though the activity is still needed to improve, hence further, the photocatalytic activity of exfoliated 2D porous g-C3N4 was improved by construction of heterostructure with titanium dioxide (TiO2) based semiconductor material. At present, we synthesized a highly efficient nanocavities assisted blue TiO2 nanorods and integrated on exfoliated 2D porous g-C3N4 photocatalyst (BT/PCN) by very simple methods. The synthesized materials were tested for photocatalytic CO2 conversion into solar fuels (H2, CO, CH4) in the presence of triethanolamine (TEOA) as sacrificial agents under solar light irradiation. The prepared NBT/PCN heterostructures displays a better photocatalytic activity for CO2 conversion as compared pristine g-C3N4, blue TiO2 nanorods. The enchantment of activity for BT/PCN heterostructure is due to effective charge carrier separation and transportation with advanced unique properties of porous natured exfoliated g-C3N4, nanocavities assisted blue TiO2 nanorods and their better interaction by each other. The photocatalytic CO2 conversion efficiency of the BT/PCN nanocomposite showed higher than earlier reported g-C3N4, TiO2 based systems. Amazingly, these results will ample possibility for the improvement of enormously real photocatalytic systems as of its cost-effectively feasible and extraordinary productivity.