Visible light responsive photocatalytic hydrogen evolution using MoS2 incorporated ZnO
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ORIGINAL ARTICLE
Visible light responsive photocatalytic hydrogen evolution using MoS2 incorporated ZnO Muhammad Bilal Tahir1 · Muhammad Sohaib1 · Muhammad Rafique2 · Muhammad Sagir3 · Najeeb Ur Rehman4 · Shabbir Muhammad5,6 Received: 14 May 2020 / Accepted: 3 June 2020 © King Abdulaziz City for Science and Technology 2020
Abstract In this article, we prepared efficient ZnO@MoS2 composites through hydrothermal and solvothermal method for photocatalytic hydrogen evolution. The structural, morphological, surface area and optical properties were investigated using transmission electron microscopy (HR-TEM), X-ray diffractometer (XRD), Brunauer Emmett Teller (BET), UV–visible (UV-vis) absorption and Photoluminescence (PL) emission spectroscopy. The incorporating effect of MoS2 on the photocatalytic performance of ZnO photocatalyst has been studied. The PL emission spectra of prepared composites elucidate that recombination of electron/hole pairs is greatly suppressed owing to the incorporation of MoS2 sheet-like nanostructures. The composite sample (3wt % of MoS2 in ZnO) showed the excellent photocatalytic efficiency when compared to pure photocatalyst. The considerable increase in the efficiency of nanocomposites may be accredited to extended absorption region, favorable band structure, and effective separation of charge carriers, large surface area and the reactive active sites provided by layered structure of MoS2. This study demonstrates that prepared composites could be promising and efficient photocatalysts for the evolution of hydrogen through water-splitting under visible light illumination. Keywords ZnO@MoS2 composite · H2 evolution · Photocatalytic activity · Photocatalyst
Introduction Clean and renewable energy is probably the most important challenge facing mankind in the twenty-first century. It is estimated that global energy demand doubled in the middle of this century, and by 2100, global energy demand will be tripled. One of the most important goals of our modern * Muhammad Bilal Tahir [email protected] 1
Department of Physics, HH Campus, University of Gujrat, Gujrat 50700, Pakistan
2
Department of Physics, University of Sahiwal, Sahiwal, Pakistan
3
Department of Chemical Engineering, HH Campus, University of Gujrat, Gujrat 50700, Pakistan
4
Department of Computer Science, HH Campus, University of Gujrat, Gujrat 50700, Pakistan
5
Research Center for Advanced Material Science (RCAMS), King Khalid University, 61413, Abha 9004, Saudi Arabia
6
Department of Physics, College of Science, King Khalid University, 61413, Abha 9004, Saudi Arabia
society is to build a sustainable environment (Gertler et al. 2019). The growing environmental problems associated with the widespread use of unsustainable fossil fuels (oil, natural gas and coal) and the growing demand for energy will sooner or later force humans to use clean and sustainable energy. Over the years, the scarcity of fossil fuels from biological remains of dead animals and plants for hundreds of millions of years ago and the en
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