Spin coating from a single source precursor is used to produce a transparent conductive electrode for a photoelectrochemical cell. Yb 2 S 3 :Cu 2 S:ZnS is discovered in the composite using X-ray diffraction analysis with a crystallite size of 44 nm. Energy-dispersive X-ray analysis and X-ray photoelectron spectroscopy reveal that the composite comprises Yb, Cu, Zn, and S with an optical bandgap of 2.49 eV. Electrical investigations in a photoelectrochemical cell are measured using cyclic voltammetry, linear sweep voltammetry, transient chronoamperometry (CA), and electrical impedance spectroscopy (EIS). Every experiment shows that the photocurrent density of the electrode is higher than when it is in the light. At all scan rates, light causes the photoelectrode's specific capacitance to increase. Specific capacitance is found to have a maximum value under illumination of 789 Fg À1 as opposed to 745 Fg À1 in the absence of a light source. The highest photocurrent density achieved by the electrode through CA is 23.5 mA. R s value of 23.4 Ω is subsequently obtained by the EIS investigation. It might be stated that this work introduces a useful photoelectrode that can be used in renewable energy systems such as photovoltaics, supercapacitors, and photoelectrochemical solar cells.
Over the recent decades, unrelenting efforts are being devoted to the sustainable design and synthesis of transitional metal oxide-based photocatalysts with controlled morphology and structural complexity to enhance their catalytic properties. In this account, we have reported the bio-fuel-assisted hydrothermal synthesis of MoO3, MoO3:NiO, and MoO3:PdO/Pd as catalysts to remove azo pollutants from an aqueous solution. Methyl orange was selected as the model dye to represent organic pollutants. This work presents a facile method for improving the visible-light-driven catalytic activity of MoO3 by introducing NiO and PdO. When MoO3:NiO and MoO3:PdO/Pd were illuminated by solar light, emitted radiation originating from oxygen vacancies of NiO and PdO synergistically participated in catalytic reactions of MoO3 giving 98% and 95 % degradation of methyl orange, respectively, in 15 min. To confirm the supporting role of NiO and PdO in the catalysis of MoO3, catalytic experiments were carried out in dark ambient conditions, with only catalysts (without stimulants). Subsequently, the degradation efficiency of MoO3:PdO, and MoO3:NiO was increased to 73% and 84% respectively, from 62 % efficiency of MoO3 suggesting that NiO and PdO greatly increased the efficiency of MoO3 in dark conditions and nearly complete removal of methyl orange by photo-induced visible light degradation. Furthermore, the photocatalysts illustrated good reusability till four runs of experiments without loss in its degradation efficiency. Therefore, the overall catalytic results of the current study are highly proposing MoO3:PdO and MoO3:NiO as excellent photocatalysts for water remediation.
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