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Journal of Solid State Electrochemistry

, Volume 22, Issue 8, pp 2499–2506 | Cite as

Semiconducting and photoelectrochemical characterizations of CuCrO2 powder synthesized by sol-gel method

  • N. Benreguia
  • A. Abdi
  • O. Mahroua
  • M. Trari
Original Paper

Abstract

The delafossite CuCrO2 elaborated by sol gel (SG) route using ethylene glycol as solvent, is p-type semiconductor characterized by a direct band gap of 1.93 eV and activation energy of 0.22 eV. The semi-logarithmic plot gives an exchange current density of 1.8 μA cm−2 in KOH (0.5 M) electrolyte, indicating a good electrochemical stability with a small hysteresis loop and high oxygen over-potential. The structure is highly anisotropic and the electrochemical study is confined in the (a, b) plane with a reversible oxygen intercalation. The capacitance measurement (C−2 - E) exhibits a linear behavior from which a flat band potential of − 0.045 ESCE and a hole density of 8.19 × 1019 cm−3 are determined. The Nyquist diagram shows a small semicircle in the high frequency domain, assigned to the faradic charge transfer, the large semicircle in the medium region is due to grain boundaries while the straight line at low frequencies is attributed to a disparity from pure impedance diffusion.

Keywords

CuCrO2 Semiconductor Sol-gel Photoelectrochemical Electrochemical impedance spectroscopy 

Notes

Acknowledgements

The work was financially supported by the Faculty of Chemistry (U.S.T.H.B) (Algiers).

Supplementary material

10008_2018_3967_MOESM1_ESM.docx (271 kb)
ESM 1 SM1 XRD pattern of the powder CCOSG after a treatment at 450 °C in air. SM2 SEM images of CuCrO2 synthesized by sol-gel method. SM3 Diffuse reflectance spectrum of CuCrO2 along with the derivative curve. SM4 Indirect optical transitions of CuCrO2 (DOCX 270 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry (USTHB)AlgiersAlgeria
  2. 2.Laboratory of Electrochemistry and Corrosion, Polytechnic Military SchoolAlgiersAlgeria
  3. 3.Laboratory of Materials Physics, Faculty of Physics (USTHB)AlgiersAlgeria

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