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Issue 6, 2012
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Room-temperature synthesis of Zn0.80Cd0.20S solid solution with a high visible-light photocatalytic activity for hydrogen evolution

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Abstract

Visible light photocatalytic H2 production from water splitting is of great significance for its potential applications in converting solar energy into chemical energy. In this study, a series of Zn1−xCdxS solid solutions with a nanoporous structure were successfully synthesized via a facile template-free method at room temperature. The obtained solid solutions were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS) and N2 adsorption–desorption analysis. The solid solutions show efficient photocatalytic activity for H2 evolution from aqueous solutions containing sacrificial reagents S2− and SO32− under visible-light irradiation without a Pt cocatalyst, and loading of the Pt cocatalyst further improves the visible-light photocatalytic activity. The optimal photocatalyst with x = 0.20 prepared at pH = 7.3 displays the highest activity for H2 evolution. The bare and 0.25 wt% Pt loaded Zn0.80Cd0.20S nanoparticles exhibit a high H2 evolution rate of 193 μmol h−1 and 458 μmol h−1 under visible-light irradiation (λ ≥ 420 nm), respectively. In addition, the bare and 0.25 wt% Pt loaded Zn0.80Cd0.20S catalysts show a high H2 evolution rate of 252 and 640 μmol h−1 under simulated solar light irradiation, respectively. Moreover, the Zn0.80Cd0.20S catalyst displays a high photocatalytic stability for H2 evolution under long-term light irradiation. The incorporation of Cd in the solid solution leads to the visible light absorption, and the high content of Zn in the solid solution results in a relatively negative conduction band, a modulated band gap and a rather wide valence bandwidth, which are responsible for the excellent photocatalytic performance of H2 production and for the high photostability.

Graphical abstract: Room-temperature synthesis of Zn0.80Cd0.20S solid solution with a high visible-light photocatalytic activity for hydrogen evolution

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Publication details

The article was received on 12 Dec 2011, accepted on 09 Jan 2012 and first published on 13 Jan 2012


Article type: Paper
DOI: 10.1039/C2NR11972B
Citation: Nanoscale, 2012,4, 2046-2053
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    Room-temperature synthesis of Zn0.80Cd0.20S solid solution with a high visible-light photocatalytic activity for hydrogen evolution

    D. Wang, L. Wang and A. Xu, Nanoscale, 2012, 4, 2046
    DOI: 10.1039/C2NR11972B

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