International Journal of Hydrogen Energy

Kamis, 03 Mei 2018 14:38 | Sudah dibaca 781 kali

Noble metal-free zinc oxysulfide (Zn(O,S)) nanoparticles for H₂ evolution had been facilely synthesized by a low-cost chemical reaction at low process temperature of 70-90 ^oC with zinc acetate dihydrate as the zinc source and different amounts of thioacetamide as the sulfur precursor. The as-prepared Zn(O,S) had a nano crystallite size of 3-10 nm and formed aggregates. Low temperature process has led to the difficulty in forming wellcrystalline nanoparticles, therefore the ionic bonding is weaker as compared to the high temperature one. Due to the entropy-controlled reaction, Zn(O,S) with different compositions, phases, and bandgaps was formed and proposed to have a three-dimensional multibandgap-quantum-well (3D MQW) band structure, as supported by the selected area electron diffraction of high resolution transmission electron microscopy. Photo reduction of Cr⁶⁺ was initially performed for our materials selection. The photocatalytic hydrogen evolution reaction (HER) of Zn(O,S) in different kinds of solutions under low power UV lamps (the intensity is 0.088 mW/cm² or approximately 1/40 times UV light intensity of sunlight) was executed. A high efficient hydrogen evolution rate of 213 µmol/g h watt was achieved by considering the input light power. The active surface oxygen anion-involved photocatalytic mechanism for HER is proposed, which was derived from the reversible change in Zn(O,S) color and the results from HER reactions in different solutions.

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