Erratum

Unfortunately, four author names were mistakenly omitted in the original article [1]. The missing authors and their affiliations are given below: Kitty Baert Vrije Universiteit Brussel, Dept. Materials and Chemistry, Electrochemical and Surface Engineering research group, Pleinlaan 2 1050-Brussels, Belgium Tom Hauffman Vrije Universiteit Brussel, Electrochemical and Surface Engineering research group François Reniers Université Libre de Bruxelles, Faculty of Sciences, Surface Chemistry, Interfaces and Nanomaterials, Campus de la Plaine - CP 255, Boulevard du Triomphe, 1050 Brussels, Belgium Philippe Thévenin MOPS laboratory, University of Lorraine, Centrale Supelec - 2, rue E. Belin B.P. 57070, Metz, France Furthermore, the name of the university in the affiliation c was wrong in the original article [1]. The correct name is “University Moulay Ismail of Meknes”.