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

被引：0
作者：
N. Benreguia
A. Abdi
O. Mahroua
M. Trari
机构：
[1] Laboratory of Storage and Valorization of Renewable Energies,
[2] Faculty of Chemistry (USTHB),undefined
[3] Laboratory of Electrochemistry and Corrosion,undefined
[4] Polytechnic Military School,undefined
[5] Laboratory of Materials Physics,undefined
[6] Faculty of Physics (USTHB),undefined
来源：
Journal of Solid State Electrochemistry | 2018年 / 22卷
关键词：
CuCrO; Semiconductor; Sol-gel; Photoelectrochemical; Electrochemical impedance spectroscopy;
D O I：
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学科分类号：
摘要：
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.
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页码：2499 / 2506
页数：7
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