NDLI: Photoelectrochemical characterization of the synthetic crednerite CuMnO$

Content Provider	Springer Nature Link
Author	Bellal, B. Hadjarab, B. Benreguia, N. Bessekhouad, Y. Trari, M.
Copyright Year	2011
Abstract	High quality crednerite CuMnO$_{2}$ was prepared by solid state reaction at 950 °C under argon flow. The oxide crystallizes in a monoclinically distorted delafossite structure associated to the static Jahn–Teller (J–T) effect of Mn$^{3+}$ ion. Thermal analysis showed that it converts reversibly to spinel Cu$_{x}$Mn$_{3−x }$O$_{4}$ at ~420 °C in air and further heating reform the crednerite above 940 °C. CuMnO$_{2}$ is p-type, narrow semiconductor band gap with a direct optical gap of 1.31 eV. It exhibits a long-term chemical stability in basic medium (KOH 0.5 M), the semi logarithmic plot gave an exchange current density of 0.2 μA cm$^{−2}$ and a corrosion potential of ~−0.1 V$_{SCE}$. The electrochemical oxygen insertion/desinsertion is evidenced from the intensity–potential characteristics. The flat band potential (V $_{fb}$ = −0.26 V$_{SCE}$) and the holes density (N $_{A}$ = 5.12 × 10$^{18}$ cm$^{−3}$) were determined, respectively, by extrapolating the curve C $^{−2 }$ versus the potential to the intersection with C $^{−2 }$ = 0 and from the slope of the Mott–Schottky plot. From photoelectrochemical measurements, the valence band formed from Cu-3d wave function is positioned at 5.24 ± 0.02 eV below vacuum. The Nyquist representation shows straight line in the high frequency range with an angle of 65° ascribed to Warburg impedance originating from oxygen intercalation and compatible with a system under mass transfer control. The electrochemical junction is modeled by an equivalent electrical circuit thanks to the Randles model.
Starting Page	867
Ending Page	872
Page Count	6
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	41
Issue Number	7
e-ISSN	15728838
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-04-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Crednerite p-Type semiconductor Photoelectrochemical Nyquist plot Industrial Chemistry/Chemical Engineering Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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