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Title: Synthesis and peferentially loading of nickel nanoparticle on CdS surface and its photocatalytic performance for hydrogen evolution under visible light

Graphical abstract: Ni nanoparticles were prepared via chemical reduction of aqueous NiCl{sub 2} by borohydride reducing agent in the presence of polyvinlylpyrolidone as a modifier to prevent fast growth of Ni crystals and their aggregation, and then preferentially deposited on (1 0 0), (0 0 2), and (1 0 1) crystal planes of CdS by photo-induced electrons while water splitting reaction occurred simultaneously. Resultant nickel nanoparticles have a size of about 3 nm, and contributes to decreasing the photoluminescence peak intensity of CdS, which means that nickel functions as the trapper of photo-generated electrons thereby quenching the photoluminescence of CdS. Therefore, nano-Ni/CdS photocatalyst with a Ni loading of 2.5% possesses the best visible-light catalytic activity for water splitting-hydrogen evolution and provides a hydrogen production rate of up to 9050 μmol h{sup −1} g{sup −1}, while it exhibits stabilized activity towards H{sub 2} evolution as well. - Highlights: • Ni nanoparticles are prepared by chemical reduction and then loaded on CdS surface by photo-reduction. • Non-noble metal Ni nanoparticles (size: about 3 nm) act as co-catalyst for photocatalytic H{sub 2} evolution. • Nano-Ni/CdS exhibits high activity (9050 μmol h{sup −1} g{sup −1}) and perfect stability. - Abstract: Ni nanoparticles were preparedmore » via chemical reduction of NiCl{sub 2} by NaBH{sub 4} in the presence of polyvinlylpyrolidone (PVP), and loaded on the surface of CdS by photo-induced electrons while water splitting reaction occurred simultaneously. Resultant Ni/CdS was characterized by high-resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet–visible light diffuse reflectance spectrometry, and photoluminescence spectrometry. It was found that as-prepared Ni nanoparticles are about 3 nm, and preferentially deposited on (1 0 0), (0 0 2), and (1 0 1) crystal planes of CdS. Meanwhile, loading nickel decreases the photoluminescence intensity of CdS, which means nickel functions as the trapper of photo-generated electrons. Therefore, nano-Ni/CdS photocatalyst with a Ni loading of 2.5% possesses the best visible-light catalytic activity for water splitting-hydrogen evolution and provides a hydrogen production rate of up to 9050 μmol h{sup −1} g{sup −1}, while it exhibits stabilized activity towards H{sub 2} evolution as well.« less
Authors:
; ;  [1] ;  [2] ;  [1]
  1. Laboratory of Fine Chemistry and Industry, Henan University, Kaifeng 475004 (China)
  2. National Engineering Center of Environmental Photocatalysis, Fuzhou University, Fuzhou 350002 (China)
Publication Date:
OSTI Identifier:
22420563
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 57; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CADMIUM SULFIDES; CRYSTAL STRUCTURE; CRYSTALS; ELECTRONS; EPITAXY; HYDROGEN; INTERSTITIAL HYDROGEN GENERATION; NANOPARTICLES; NANOSTRUCTURES; NICKEL; NICKEL CHLORIDES; PHOTOCATALYSIS; PHOTOLUMINESCENCE; PVP; REDUCTION; SEMICONDUCTOR MATERIALS; TRANSMISSION ELECTRON MICROSCOPY; VISIBLE RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY