Platinum-decorated Cu(InGa)Se2/CdS photocathodes: Optimization of Pt electrodeposition time and pH level

Min woo Kim, Hyun Yoon, Tae Yoon Ohm, Mukund G. Mali, Sung Kyu Choi, Hyunwoong Park, Salem S. Al-Deyab, Dong Chan Lim, Se Jin Ahn, Suk Goo Yoon

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2 Citations (Scopus)

Abstract

Photoelectrochemical (PEC) water splitting was performed using co-evaporated Cu(In,Ga)Se2 (CIGS, p-type) films as the photocathode. Pt was electrodeposited on CIGS and CIGS/CdS films. The effect of the electrodeposition time was investigated to determine the optimal deposition conditions. The CIGS film was covered with a 60-nm-thick CdS layer (n-type) using a chemical-bath deposition technique, which created a p-n junction. The effect of the Pt electroplating time was again investigated for the CIGS/CdS films; thus, the effect of CdS addition could be quantitatively investigated. The effect of the pH of 0.5 M Na2SO4 electrolyte was also investigated. The optimal water-splitting performance occurred at −24.16 mA/cm2 at −0.7 V vs. Ag/AgCl with a Pt electrodeposition time of 20 min and pH 9. The CIGS/CdS films were characterized by X-ray diffraction, scanning electron microscopy, and focused-ion beam transmission electron microscopy.

Original languageEnglish
Pages (from-to)294-300
Number of pages7
JournalJournal of Alloys and Compounds
Volume692
DOIs
Publication statusPublished - 2017 Jan 25

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Keywords

  • CIGS/CdS
  • p-n junction
  • Photocurrent
  • Platinum
  • Water splitting

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Kim, M. W., Yoon, H., Ohm, T. Y., Mali, M. G., Choi, S. K., Park, H., Al-Deyab, S. S., Lim, D. C., Ahn, S. J., & Yoon, S. G. (2017). Platinum-decorated Cu(InGa)Se2/CdS photocathodes: Optimization of Pt electrodeposition time and pH level. Journal of Alloys and Compounds, 692, 294-300. https://doi.org/10.1016/j.jallcom.2016.08.313