Abstract
Specific adsorption of ions of ionic liquids on an electrode plays an important role in controlling the mass and/or charge transport phenomena in electrochemical techniques. Insufficient experimental evidences put limit on wider acceptance and usage of ionic liquids in the field of energy devices. In the present study, two different photoelectrochemical cells (PECs) having configurations as (i) PbOx/Fe(CN)6 -4/-3/Pt and (ii) PbOx/[Bmim]Tf2N/Pt were utilized to provide the experimental pathway and to unveil the adsorption characteristics of ion-pairs of any ionic liquid. The photoresponse curves of PECs under chopped light illumination conditions were used to extract the flatband potential of PbOx film. The band edge positions and electron affinity of PbOx films were calculated with the help of Mott-Schottky plots. It is well known that the adsorption properties of electrolytes can be understood by calculating the point of zero charge (pHpzc). Hence, this parameter was calculated by analyzing the temperature dependent flatband potential which further unveiled the adsorption characteristics of ionic liquids. This study is an unexplored approach to get closer to the understanding of inherent properties of ionic liquids which can be of utmost interest to either basic or applied field researchers.
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