The Impact Factor of a journal (that is usually made available every year in June) is essentially dependent on the most cited papers published in the first of the two years period over which citations are reckoned. Therefore, the Impact Factor for 2005 is mainly dependent on the citations collected by the papers published in 2003. In this respect, the Editors of Electrochimica Acta are pleased to list below the papers appeared in the journal in 2003 that have received thus far the highest number of citations, thus contributing essentially to establish the value of the IF. Congratulations to the Authors!The most cited papers of 2003Y. Zhang, S. Asahina, S. Yoshihara, T. Shirakashi, Oxygen reduction on Au nanoparticle deposited boron-doped diamond films, Electrochimica Acta 48 (6), 741–747.H.G. Herz, K.D. Kreuer, J. Maier, G. Scharfenberger, M.F.H. Schuster, W.H. Meyer, New fully polymeric proton solvents with high proton mobility, Electrochimica Acta 48 (14–16 SPEC.), 2165–2171.N. Dimov, S. Kugino, M. Yoshio, Carbon-coated silicon as anode material for lithium ion batteries: advantages and limitations, Electrochimica Acta 48 (11), 1579–1587. Sergio Trasatti Editor-in-Chief