Abstract
CuxS (x → 2) thin films were obtained by sulfidization of copper thin films previously obtained by spin-coating from a dichloromethane solution of [Cu(II)(2-ethyl hexanoate)2(H2O)2] deposited on ITO substrate, irradiated with UV light and electrochemically reduced. Through cyclic voltammetry experiences performed in a 0.05 M Na2B4O7 buffer solution containing 5 mM Na2S, the electroformation mechanism of CuxS phase is controlled by a first electron transfer, obtaining an initial formation of Cu(HS)ads that evolves to a CuxS phase. Potentiostatic current transient recorded in the potential range of −0.8 V ≤ E ≤ −0.7 V showed that the nucleation and growth mechanism of the CuxS phase obeys a two-dimensional instantaneous process with diffusional and charge-transfer contributions. AFM analysis of the deposits shows that CuxS phase is preferentially deposited in the valleys left by ITO particles. The average size of CuxS particles is close to 20 nm. Cyclic voltammetry results, electromotive force determination...
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