LAUSR

Abstract The total current of electroanalytical data is assumed to be composed of three main constituents including faradaic current, step charging current and induced charging current. The contribution of each type of current in total current can be related to the structure and composition of the electrode as well as the nature of the analyte and supporting electrolyte. By using multivariate curve resolution-alternating least squares (MCR-ALS), as a powerful chemometrics technique, total current can be deconvoluted to its three components. In this study, the contribution of faradaic current in total current at carbon ionic liquid electrodes (CILEs) was investigated. The main focus was on the effect of the molecular structure of ionic liquid and it's weighting percent in the electrode. The studied ionic liquids were heptylpyridinium hexa-fluorophosphate, decylpyridinium hexa-fluorophosphate and dodecylpyridinium hexa-fluorophosphate at four different compositions. Results showed that structure of ionic liquid and it is weighting has a significant effect on faradaic current contribution. The contribution of the relative faradaic current varies in the range of 27% to 37% whereas the contribution of the charging current is much higher and that of induced charging current represents the least contribution.