Potential Dependent Adsorption and Desorption of Nafion on a Gold and a Platinum Electrode Surface

Potential dependent adsorption and desorption of perfluorosulfonated ionomer (PFSI) on a gold and a platinum electrode surface was investigated by cyclic voltammetry (CV), electrochemical quartz crystal microbalance (EQCM), and electrochemical atomic force microscopy (EC-AFM) in a Nafion, that is, PFSI, dispersed aqueous solution without any other electrolyte. It was found that electrochemical measurements can be performed in this solution without any significant IR drop. PFSI adsorbed on the gold and platinum surfaces in the double layer region and desorbed from the surfaces when the oxide was formed. Once the oxide was reduced, PFSI readsorbed on the surfaces. These processes took place reversibly.

  ¹⁾ T. Masuda, K. Ikeda, K. Uosaki, Langmuir, 2013, 29, 2420.

  ²⁾ T. Masuda, H. Fukumitsu, T. Kondo, H. Naohara, K. Tamura, O. Sakata, K. Uosaki, J. Phys. Chem. Soc., 2013, 117, 12168-12171.

  ³⁾ T. Masuda, F. Sonsudin, P. R. Singh, H. Naohara, K. Uosaki, J. Phys. Chem. Soc., 2013, 117, 15704-15709.