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V. Navakoteswara Rao(라오),Karthik Kannan(카난),Bee Lyong Yang(양비룡),Jun-Mo Yang(양준모) 한국에너지기후변화학회 2021 한국에너지기후변화학회 학술대회 Vol.2021 No.11
Hydrogen gas is cleaner fuel and generates electrical energy in proton exchange membrane fuel cell with high efficiency. Many methods they reports hydrogen production like wind power, electrolysis, paralysis of oils and gasification goober gas among them renewable energy process, photocatalysis is a promising method for hydrogen production at near ambient conditions in aqueous medium. Here in we report Bi₂S₃@NiO-In₂S₃- TiO₂ core-shell nanostructures for enhanced hydrogen generation. The present work explores systematic study on the single step modified hydrothermal method Bi₂S₃ core coated by the shell NiO-In₂S₃-TiO₂ for enhanced photocatalytic hydrogen production (see in Figure1). The core-shell material composed of flower like nanostructures conformed by SEM characterizations and elemental analysis of the composite is presented Bi, Ni, In, S, Ti and O respectively. Bi₂S₃@NiO-In₂S₃-TiO₂ flower like structures and shell thickness 5-10 nm conformed by TEM analysis. XPS spectroscopy publicized chemical state of the core-shell nanostructure exists as Bi<SUP>+2</SUP>, Ni<SUP>+2</SUP>, In<SUP>+2</SUP>, Ti<SUP>4+</SUP>, S<SUP>2-</SUP> and O<SUP>2-</SUP>respectively. Among them Bi₂S₃/TiO₂ was shows high rate of H₂ evolution 44.1 mmol.h<SUP>-1</SUP>.g<SUP>-1</SUP>cat under UV- Visible light irradiation.
V. Navakoteswara Rao(라오),Karthik Kannan(카난),Bee Lyong Yang(양비룡),Bee Lyong Yang(양준모) 한국에너지기후변화학회 2021 한국에너지기후변화학회 학술대회 Vol.2021 No.11
Growth of hierarchal nano-structured photocatalyst with ultra-thin shell materials TiO₂@NiO@ZnS is of great importance towards the stable and continuous hydrogen (H2) production, where the shell materials avoids the photo-corrosion of the core for longer stability with continuous H2 generation. Accordingly, herein, we report a comparative studies on the CdS core coated with three various shell materials like (TiO₂@NiO@ ZnO) for enhanced H2 production under visible light irradiation. The structural and morphological characterizations using XRD and TEM techniques revealed the formation of phase pure CdS@TiO₂@NiO@ZnO nanocomposites, with sphere type structures having core diameter and shell thickness of 395 and 15 nm and rod like structure with diameter 82.4 and shell thickness 6.3 nm respectively. XPS studies revealed that the constituted elements in the nanocomposite exist in their valence states of the nanocomposites, which indicated the stable structural integrity of the individual phase in the core@shell structure. The synergistic optical properties of hierarchal nanostructure showed the absorption edge around 500 nm and the decreased PL intensity indicated the improved charge recombination resistance in the core@shell nanocomposite. The photocatalytic activity comparison between these three different materials reveals in the order of TiO₂ > NiO > ZnO under visible light irradiation. Based on the obtained results, were observed among these materials the CdS@TiO₂ core@shell photocatalyst showed higher efficiency due to the increased charge separation, spatial distributions of the carriers and effect of the structural properties.
Enhanced Photocatalytic Hydrogen Production of Hydrothermally prepared CuO-NiO-ZrO₂ Nanocomposite
Karthik Kannan(카난),V. Navakoteswara Rao(라오),Mikiyas Mekete Meshesha(미키),Jun-Mo Yang(양준모),Na Young Kwan(권나영),Jaewon Lee(이재원),Heo Jae-Young(허재영),Bee Lyong Yang(양비룡) 한국에너지기후변화학회 2021 한국에너지기후변화학회 학술대회 Vol.2021 No.11
Hydrogen production from photocatalytic water splitting by non-noble-metal photocatalysts is considered to be the most promising solution to the world energy crisis issues. Herein, a CuO-NiO-ZrO₂ composite with remarkable photocatalytic water reduction activity has been successfully fabricated via a wet chemical route. The crystallinity, morphological, optical characteristics, and photocatalytic hydrogen production of the composite were investigated by XRD, TEM with SAED, and UV-Vis. The results of the XRD study affirmed that the nanocomposite comprises cubic, monoclinic and tetragonal phases. TEM with SAED and EDS analysis demonstrates the surface morphology and formation of the composite. The optical bandgap of CuO-NiO-ZrO₂ nanocomposite is calculated through UV-Vis analysis. The unique morphology, significantly improved charge carrier separation, and synergistic effects of the composite system should be responsible for the excellent photocatalytic activity. These findings propose a new unexplored avenue for the fabrication of highly active and low- cost photocatalyst for practical H₂ generation via photocatalytic reduction.