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Influence of precursor crystallinity on photocatalytic activity of PdS/CdS-ZnS

P. SVERA1,2, A.V. RACU1,3, C. MOSOARCA1, D. URSU1,2, P. A. LINUL1, R. BAIES1,2, R. BANICA1,2,*

Affiliation

  1. National Institute for Research and Development in Electrochemistry and Condensed Matter, 1 Plautius Andronescu Str, 300224 Timisoara, Romania
  2. University Politehnica Timisoara, Piata Victoriei 2, 300006 Timisoara, Romania
  3. Institute of Applied Physics of Moldova, ASM, Academiei str 5, Chisinau, Moldova

Abstract

In this work we present the synthesis and the photocatalytic activity of PdS/CdS-ZnS composites. The photocatalysts were obtained in hydrothermal conditions at 170 ºC from zinc sulphides as sulphide source. The products were characterized by powder X-ray diffraction scanning electron microscopy, energy-dispersive X-ray, transmission electron microscopy, UV–visible and photoluminescence spectroscopies. From Tauc plot the optical energy gap was found to be nearly 2.40 eV. Experiments for hydrogen evolution were conducted in sulfide/sulfite aqueous solution under visible light. The size of photocatalyst nanoparticles and the efficiency of water splitting reaction increases with increasing of ZnS precursor crystallinity. The maximum value for hydrogen evolution rate is 3.8 mmol∙g-1h -1 , for the sample with the highest crystallinity..

Keywords

Photocatalysis, ZnS/CdS, Water splitting.

Submitted at: Aug. 28, 2015
Accepted at: Nov. 25, 2016

Citation

P. SVERA, A.V. RACU, C. MOSOARCA, D. URSU, P. A. LINUL, R. BAIES, R. BANICA, Influence of precursor crystallinity on photocatalytic activity of PdS/CdS-ZnS, Journal of Optoelectronics and Advanced Materials Vol. 18, Iss. 11-12, pp. 1027-1032 (2016)