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Title: Synthesis of titania wrapped cadmium sulfide nanorods for photocatalytic hydrogen generation

Abstract

Highlights: • TiO{sub 2}@CdS nanorods with core/shell morphology prepared by simple hydrothermal method. • TiO{sub 2} shell thickness optimized for enhanced photocatalytic activity. • Initial concentration of sacrificial agent and solution pH were optimized for H{sub 2} generation. • Optimized photocatalyst C{sub 3}T{sub 3} displayed stable and continuous H{sub 2} evolution for 20 h. • Optimised catalyst showed 12-folds efficient H{sub 2} production under UV–vis vs visible light. - Abstract: Herein we report a simplified synthetic approach for a semiconductor photocatalyst (CdS) wrapped with a nanoscale thin-layer of semiconducting material (TiO{sub 2}) to overcome the instability issues, besides the improved catalytic efficiency. Images of HR-TEM and elemental mapping evidenced the presence of CdS that covered by ultra thin-layer of TiO{sub 2} as shell. The UV–vis diffuse reflectance spectra showed red-shift in absorption edge in visible region. The photocatalytic water splitting towards hydrogen production using Na{sub 2}S/Na{sub 2}SO{sub 4} as sacrificial agent was evaluated under UV–vis and visible light irradiation. The essential variables such as thickness of TiO{sub 2} shell, amount of sacrificial agent and solution pH were fine tuned to achieve hydrogen generation of 5791 mL h{sup −1} g{sup −1} of catalyst. The higher efficiency is ascribed to core/shell morphologymore » of CdS/TiO{sub 2} system that channelled the excitons to the surface for the red-ox reactions rather than recombination. The catalytic stability result ascertained that the photo-corrosion is greatly suppressed.« less

Authors:
; ;  [1]; ;  [2];  [3]
  1. Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa 516005, Andhra Pradesh (India)
  2. Functional Materials Division, Central Electrochemical Research Institute (CSIR-CECRI), Karaikudi 630 003, Tamil Nadu (India)
  3. SRM Research Institute, SRM University, Kattankulathur 603203, Tamil Nadu (India)
Publication Date:
OSTI Identifier:
22804059
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 103; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CADMIUM SULFIDES; EXCITONS; HYDROGEN PRODUCTION; HYDROTHERMAL SYNTHESIS; IRRADIATION; MORPHOLOGY; NANOSTRUCTURES; PH VALUE; PHOTOCATALYSIS; RED SHIFT; SEMICONDUCTOR MATERIALS; SODIUM SULFATES; SODIUM SULFIDES; SPECTRA; THIN FILMS; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; ULTRAVIOLET RADIATION; VISIBLE RADIATION; WATER

Citation Formats

Rao, V. Navakoteswara, Reddy, N. Lakshmana, Kumari, M. Mamatha, Ravi, P., Sathish, M., Neppolian, B., and Shankar, M.V., E-mail: shankar@yogivemanauniversity.ac.in. Synthesis of titania wrapped cadmium sulfide nanorods for photocatalytic hydrogen generation. United States: N. p., 2018. Web. doi:10.1016/J.MATERRESBULL.2018.03.030.
Rao, V. Navakoteswara, Reddy, N. Lakshmana, Kumari, M. Mamatha, Ravi, P., Sathish, M., Neppolian, B., & Shankar, M.V., E-mail: shankar@yogivemanauniversity.ac.in. Synthesis of titania wrapped cadmium sulfide nanorods for photocatalytic hydrogen generation. United States. https://doi.org/10.1016/J.MATERRESBULL.2018.03.030
Rao, V. Navakoteswara, Reddy, N. Lakshmana, Kumari, M. Mamatha, Ravi, P., Sathish, M., Neppolian, B., and Shankar, M.V., E-mail: shankar@yogivemanauniversity.ac.in. 2018. "Synthesis of titania wrapped cadmium sulfide nanorods for photocatalytic hydrogen generation". United States. https://doi.org/10.1016/J.MATERRESBULL.2018.03.030.
@article{osti_22804059,
title = {Synthesis of titania wrapped cadmium sulfide nanorods for photocatalytic hydrogen generation},
author = {Rao, V. Navakoteswara and Reddy, N. Lakshmana and Kumari, M. Mamatha and Ravi, P. and Sathish, M. and Neppolian, B. and Shankar, M.V., E-mail: shankar@yogivemanauniversity.ac.in},
abstractNote = {Highlights: • TiO{sub 2}@CdS nanorods with core/shell morphology prepared by simple hydrothermal method. • TiO{sub 2} shell thickness optimized for enhanced photocatalytic activity. • Initial concentration of sacrificial agent and solution pH were optimized for H{sub 2} generation. • Optimized photocatalyst C{sub 3}T{sub 3} displayed stable and continuous H{sub 2} evolution for 20 h. • Optimised catalyst showed 12-folds efficient H{sub 2} production under UV–vis vs visible light. - Abstract: Herein we report a simplified synthetic approach for a semiconductor photocatalyst (CdS) wrapped with a nanoscale thin-layer of semiconducting material (TiO{sub 2}) to overcome the instability issues, besides the improved catalytic efficiency. Images of HR-TEM and elemental mapping evidenced the presence of CdS that covered by ultra thin-layer of TiO{sub 2} as shell. The UV–vis diffuse reflectance spectra showed red-shift in absorption edge in visible region. The photocatalytic water splitting towards hydrogen production using Na{sub 2}S/Na{sub 2}SO{sub 4} as sacrificial agent was evaluated under UV–vis and visible light irradiation. The essential variables such as thickness of TiO{sub 2} shell, amount of sacrificial agent and solution pH were fine tuned to achieve hydrogen generation of 5791 mL h{sup −1} g{sup −1} of catalyst. The higher efficiency is ascribed to core/shell morphology of CdS/TiO{sub 2} system that channelled the excitons to the surface for the red-ox reactions rather than recombination. The catalytic stability result ascertained that the photo-corrosion is greatly suppressed.},
doi = {10.1016/J.MATERRESBULL.2018.03.030},
url = {https://www.osti.gov/biblio/22804059}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 103,
place = {United States},
year = {2018},
month = {7}
}