Lanthanum Thin Film on Boron-Doped Diamond, Glassy Carbon and Platinum Electrodes-An Electrochemical Approach

Electrodeposition of lanthanum (La) thin film had been successfully carried out in the triethylmethylammonium methyl sulfate (TEMAMS) ionic liquid on boron-doped diamond (BDD), glassy carbon (GC) and platinum (Pt) electrodes. The electrolyte shows highest electrochemical stability window of 4.88 V on the BDD, followed by the GC (4.5 V) and Pt (4.1 V). The electrochemical reduction of La(III) ions takes place significantly at a less positive potential on the BDD than the GC, while on the Pt electrode, predominant decomposition current associated with electrochemical reduction/oxidation of TEMAMS dominates the overall process. Surface morphologic characteristics of La thin film deposits obtained on the three electrodes were characterized by scanning electron microscope (SEM) and deposited lanthanum thin film was confirmed by energy-dispersive X-ray spectroscopy (EDS) analysis.