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    Öğe
    Enhanced photocatalytic hydrogen evolution from band-gap tunable Ag2S:X (X?=?Ni, Co, Zn, Mn) nanocrystals: Effect of transition metal ions
    (Elsevier B.V., 2020) Yanalak, Gizem; Sarılmaz, Adem; Karanfil, Gizem; Aslan, Emre; Ozel, Faruk; Hatay Patir, Imren
    In the present work, Ni, Co, Zn and Mn doped Ag2S nanocrystal catalysts were prepared via the hot-injection technique which is one of the top-down approach. The nanocrystals were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscope (SEM), diffuse reflectance spectroscopy (DRS), UV?vis spectroscopy (UV) and cyclic voltammetry (CV) to illuminate the crystal properties and the photocatalytic mechanism. The presence of doping each of the transition metals on Ag2S nanocrystals were tested for their performance in the photocatalytic hydrogen evolution from water containing TEOA and EY as a hole scavenger and photoabsorber, respectively. The results demonstrated that Ni, Co, Zn and Mn doped Ag2S nanocrystals were showed higher photocatalytic activity as compared with the Ag2S under visible light irradiation source. In addition, transition metal consisting Ag2S catalysts, which in view of the limited literatures, provides new insights for expanding the application of chalcogenide catalysts. © 2020 Elsevier B.V.
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    Öğe
    Scheelite-type BaMoO4 and BaWO4 based dye sensitized photocatalytic hydrogen evolution by water splitting
    (Elsevier Ltd., 2022) Yanalak, Gizem; Özen, Abdurrahman; Sarılmaz, Adem; Keleş, Ali; Aslan, Emre; Özel, Faruk; Hatay Patir, Imren
    Nowadays, the development of cost-effective and stable catalyst has greatly drawn attention for electrocatalytic and photocatalytic hydrogen evolution reactions. Herein, photocatalytic hydrogen evolution has been investigated by using BaMoO4 and BaWO4 catalysts in the presence of triethanolamine and eosin-Y as a sacrificial agent and visible-light-sensitizer, respectively. These refractory metal-based oxides prepared by solid phase synthesis procedure have been characterized by structural, morphological, optical and electrochemical techniques, which are obtained with high crystallinity and adequate stoichiometric ratios. While the hydrogen evolution rate of BaMoO4 is higher than BaWO4 in the first hours of photocatalytic reaction, BaWO4 displays more stable activity for hydrogen evolution, which is reached 3.37 mmolg−1 after the 8 h of photocatalytic reaction. The proposed mechanism of dye-sensitized photocatalytic hydrogen evolution is explained by data obtained from optical and electrochemical properties