Statistical analysis of the effects of the variation of mediator concentration, spin rate, and solvent type on spin coated [Ru(NH3)6]³⁺/Nafion/ITO modified electrodes

• Main Authors: Palisoc, Shirley T., Kaw, Kevin Anthony Y., Co, Frumencio F., Natividad, Michelle T.
• Format: text
• Published: Animo Repository 2017
• Subjects: Voltammetry; Thin films; Coating processes; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/1189
• Institution: De La Salle University

Hexaammineruthenium-Nafion films were spin coated on indium tin oxide coated glass substrates to protect them against fouling and to enhance their transport properties. The mediator concentration (hexaamineruthenium or RuHex), spin rate, and solvent type (ethanol, methanol, and isopropanol) were varied to determine the optimal composition of [Ru(NH3)6]3+/Nafion/ITO modified electrodes that will yield the best electrode as defined by their transport properties. Cyclic voltammetry results show that spin rate provides minimal peak current change. RuHex concentration had the highest influence on peak height. Isopropanol diluted solutions had higher anodic peaks compared to other alcohols. Ethanol diluted solutions had the highest reversibility ratio, albeit by a small margin. Methanol diluted solutions were the most stable in terms of relative standard deviation. Statistical analyses with 3-way ANOVA reveal that the 3 parameters do not have an interaction effect. The 2-way ANOVA test, however, identified that there is an interaction effect between solvent type and RuHex concentration.