Electrochemical Behavior of S and C Mono-Doped Sodium Tantalate Photocatalysts

Sodium tantalate powder was synthesized and doped with suitable anions using a low-temperature hydrothermal process. The prepared samples were investigated for photocatalytic and electrochemical behavior using various characterization techniques. The crystal structure, stretching frequencies, and su...

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Bibliographic Details
Published in:Journal of electronic materials 2021-12, Vol.50 (12), p.7133-7142
Main Authors: Karna, Sunil, Neupane, Dipesh, Mishra, Sanjay R., Choi, Jonghyun, Gupta, Ram K., Karna, Priya
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical evolution
Chemistry and Materials Science
Crystal structure
Crystallites
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrode materials
Electronics and Microelectronics
Fourier transforms
Hydrogen evolution
Infrared spectroscopy
Instrumentation
Low temperature
Materials Science
Morphology
Optical and Electronic Materials
Original Research Article
Perovskites
Photocatalysis
Sodium
Solid State Physics
Spectrum analysis
Structural analysis
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Summary:Sodium tantalate powder was synthesized and doped with suitable anions using a low-temperature hydrothermal process. The prepared samples were investigated for photocatalytic and electrochemical behavior using various characterization techniques. The crystal structure, stretching frequencies, and surface morphology were studied using X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM), respectively. The electrochemical performances of the samples were studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) analysis. Kinetics of hydrogen evolution (HER) and oxygen evolution (OER) reactions in a basic electrolyte were also investigated. From the above characterization techniques, it has been revealed that NaTaO 3 (or, NT), c-NaTaO 3 (or, cNT), and s-NaTaO 3 (or, sNT) have a cubic crystal structure in the perovskite phase and possess direct band gaps of energies 3.9 eV, 3.8 eV, and 3.7 eV, respectively. The average crystallite size of NT, cNT, and sNT is calculated as 15 nm, 12 nm, and 20 nm, respectively. sNT has higher capacitive properties than NT and cNT, but it cannot be considered a typical supercapacitor electrode material. However, all the samples have shown optimal performance in hydrogen and oxygen evolution processes.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-021-09206-x