Electrochemical studies were carried out on Biologic VSP-300 potentiostat/galvanostat. All measurements were done on 10 mM PBS solutions containing 5 mM of K3[Fe(CN)6] and K4[Fe(CN)6] as the redox probes. One PBS tablet was dissolved in 200 ml deionized water, according to the manufacturer's protocol, to obtain 10 mM PBS solutions. A three-electrode setup, with LIG as both the working electrode (WE, A = 0.085 cm 2 ) and the counter electrode (CE) and silver/silver chloride as reference electrode (RE), was used. All measurements were performed under ambient conditions (22°C).