Cesium doped H 3 PW 12 O 40 nanocrystalline thin films using single step hydrothermal route and its photoelectrochemical
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Cesium doped H3PW12O40 nanocrystalline thin films using single step hydrothermal route and its photoelectrochemical properties Sameer N. Nadaf1, Satish S. Patil1, Vilasrao A. Kalantre2, Sawanta S. Mali3, Chang Kook Hong3, Sambhaji R. Mane1, and Popatrao N. Bhosale1,* 1
Materials Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, MS 416004, India Department of Chemistry, Balasaheb Desai College, Patan, MS 415206, India 3 School of Applied Chemical Engineering, Chonnam National University, Gwangju 61186, South Korea 2
Received: 15 February 2020
ABSTRACT
Accepted: 26 August 2020
The present report focuses on, comparative study of the phosphotungstic acid (H3PW12O40) (PTA) and cesium (Cs?) ion-doped phosphotungstic acid (Cs3PW12O40) (Cs-PTA) nanocrystalline thin films via facile hydrothermal route. The synthesized PTA and Cs-PTA thin films were characterized for their optostructural, morphological, compositional, electrical, and photoelectrochemical properties. The optical absorption study revealed that direct allowed type of electronic transition with decrease in band gap energy from 3.24 to 2.94 eV as a function of Cs? ion concentration in Cs-PTA thin films. A structural study shows that the synthesized PTA and Cs-PTA thin films were polycrystalline in nature with the formation of a spinel cubic crystal structure. Morphology of the deposited Cs-PTA films illustrates the formation of dense, uniform nanosphere like morphology. The high-resolution transmission electron microscopy (HR-TEM) and selected area electron diffraction (SAED) study confirm the formation of polycrystalline nature of the Cs-PTA thin films. Compositional analysis demonstrates that stoichiometric film formation with valence states of Cs?, O2-, W6?, and P5? was existed in the Cs-PTA films. The electrical measurement (EC) study shows semiconducting behavior with p-type in nature. Current density–voltage (J–V) measurement demonstrates that CsPTA thin films shows boost in PEC performance with photoconversion efficiency of 2.20%.
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https://doi.org/10.1007/s10854-020-04361-z
J Mater Sci: Mater Electron
1 Introduction In the past few decades, the demand for renewable and clean energy sources, especially geothermal, wind, and solar energy paid to grow important as limitations on the non-renewable energy sources [1]. The polyoxometalate (POMs) thin films are a familiar class of structurally well-defined networks of early transition anionic cluster built from transition metal oxyanions that are connected via oxide ions [2]. POMs are the polyoxoanions of the early transition elements, especially vanadium (V5?), molybdenum (Mo6?), tungsten (W6?) etc., due to their ability to form oxyanions or polyoxometalate. These anionic networks built primarily by the edge and occasionally, corner-sharing of MO6 octahedra, and heteroatom XO4 tetrahedra, where the tetrahedra are usually an interior position of th
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