NDLI: Enhanced visible-light photocatalytic hydrogen production activity of three-dimensional mesoporous p-CuS/n-CdS nanocrystal assemblies

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Inorganic Chemistry Frontiers Vol - 4 Issue - 2

Inorganic Chemistry Frontiers Vol - 4 Issue - 1

Inorganic Chemistry Frontiers Vol -3

Inorganic Chemistry Frontiers Vol -2

Inorganic Chemistry Frontiers Vol -1

Enhanced visible-light photocatalytic hydrogen production activity of three-dimensional mesoporous p-CuS/n-CdS nanocrystal assemblies

Content Provider	Royal Society of Chemistry (RSC)
Author	Trapali, Adelais Liu, Bin Armatas, Gerasimos S. Miao, Jianwei Vamvasakis, Ioannis
Copyright Year	2017
Abstract	Transition metal sulfide nanoparticles currently attract enormous research attention because of their high photon-to-electron conversion efficiency, excellent electron conductivity and low cost. However, single-component metal sulfides suffer from low charge-carrier separation yield and poor chemical stability. Here, we report the synthesis of mesoporous structures of n-type CdS and p-type CuS nanocrystals and investigate their photocatalytic performance for the generation of hydrogen from water. X-ray diffraction, transmission electron microscopy and nitrogen physisorption data indicate that the resultant CuS/CdS heterostructures consist of a highly porous network (BET surface area ∼198–203 m2 g−1) of connected 5 nm-sized nanoparticles and contain uniform mesopores (ca. 6.4 nm in diameter) within the assembled structure. The nanoparticles are composed of CuS compounds which are in intimate contact with CdS nanocrystals, and these results are corroborated with energy-dispersive and X-ray photoelectron spectroscopy measurements. These CuS/CdS binary semiconductors can carry out photocatalytic reduction of water under visible light irradiation with a quantum efficiency up to ∼12.6% at a wavelength of 420 ± 10 nm. UV–vis/NIR, photoluminescence and electrochemical impedance spectroscopy studies show that the superior photocatalytic activity of the CuS/CdS nanoparticle networks mainly arises from a proper alignment of the band-edge positions of the materials, which suppress carrier recombination and permit efficient interfacial charge transport at the p-CuS/n-CdS junction region.
Starting Page	433
Ending Page	441
Page Count	9
File Format	HTM / HTML PDF
ISSN	20521553
Volume Number	4
Issue Number	3
Journal	Inorganic Chemistry Frontiers
DOI	10.1039/c6qi00515b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Transition metal Cadmium sulfide Mesoporous material Extrinsic semiconductor Hydrogen X-ray crystallography Transmission electron microscopy Nitrogen Physisorption Intimate Contact X-ray photoelectron spectroscopy Photoemission spectroscopy Quantum Wavelength Photoluminescence Electrochemistry Electrical impedance Spectroscopy Nanoparticle Carrier generation and recombination
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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