Substrate effect on the electrochemical capacity pattern (ECP) of PbS

Abstract

Different metals (Zn, Cu, Pb) were electrodeposited on indium tin oxide (ITO/metal). ITO/metal was used as a substrate for ZnO and PbS deposition, and finally the PbS surface was encapsulated with ZnS. The electrochemical capacitance, CEC, of each thin layer was calculated from the cyclic voltammetry data and plotted against the applied potential. The plots showed different electrochemical capacity pattern (ECP) for PbS with different metal substrates. It seems that these patterns are effectively controlled by the ECP of the metal substrates. Also, the PbS CEC values were calculated from electrochemical impedance spectroscopy, EIS, to be compared with PbS CEC values obtained from cyclic voltammetry. The results of this comparison were completely consistent with each other and confirm different metal as a substrate effects on the PbS and may lead to a structure with different ECP. In the X-ray diffraction pattern, the presence of different preferential orientation of metal crystals was confirmed, which have been leaded to the formation of PbS deposits with different ECP.