Physicochemical and Electrocatalytic Performance of Chromium doped Iron Pyrite Thin Films

  • P. Prabukanthan Muthurangam Government Arts College
  • M. Sreedhar Muthurangam Government Arts College
  • G. Harichandran University of Madras
  • T. Tatarchuk Vasyl Stefanyk Precarpathian National University
  • K. Dinakaran Thiruvalluvar University
  • S. Uthayakumar Royal Holloway University of London
  • A. Younis University of Bahrain
Keywords: Electrochemical deposition, semiconductor thin films, pyrite, impedance spectroscopy, electrocatalytic activity, surface analysis

Abstract

Chromium (Cr3+) doped iron pyrite (FeS2) thin films were deposited on ITO substrate by a facile electrochemical deposition process. The effect of chromium content on structural, optical, electrical, morphological, and electrocatalytic behavior of the pyrite thin films were examined. X - ray diffraction studies confirmed the formation of cubic crystal structure of deposited thin films. Atomic force microscopy results indicate that Cr3+ doping has strong influence on crystallinity, surface roughness and grain size of as-deposited thin films. Further, bandgap reduction was found in Cr3+ doped FeS2 thin films. The interfacial charge resistance of fabricated thin films was investigated by electrochemical impedance spectroscopy and 3 mole % Cr3+ doped FeS2 thin films showed excellent conductivity with a low charge transfer resistance of 49 .  Further, the electrocatalytic performance of the prepared pyrite thin films was investigated. Cr doped thin films were found to exhibit better performance. Anti-structural modeling was opted to investigate the characteristics of defects in fabricated thin films and it was established that Cr3+substitutionmay form cation (Fe2+) vacancies which could be responsible for enhanced photochemical and electrochemical activities in Cr-doped FeS2 thin films.

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Published
2022-03-13
How to Cite
PrabukanthanP., SreedharM., HarichandranG., TatarchukT., DinakaranK., UthayakumarS., & YounisA. (2022). Physicochemical and Electrocatalytic Performance of Chromium doped Iron Pyrite Thin Films. Physics and Chemistry of Solid State, 23(1), 134-143. https://doi.org/10.15330/pcss.23.1.134-143
Section
Scientific articles (Chemistry)