"Andrzej Stokłosa is Professor Emeritus at Cracow University of Technology, Faculty of Chemical Engineering and Technology in Krakow, Poland. After receiving MSc degree in chemistry, at the Jagiellonian University in Krakow, he was employed at the AGH University of Mining and Metallurgy in Krakow in the Department of Solid State Chemistry in the group of Professor Stanisław Mrowec. He received his PhD degree in 1972, DSc (habilitation) degree in 1984. He moved to Cracow University of Technology in 1989 and became Head of Physical Chemistry Department as Associate Professor and was promoted to full professor position in 1992. Professor A. Stokłosa is an author and co-author of more than 150 scientific papers, the author of books: Non-Stoichiometric Oxides of 3d Metals (Trans. Tech. Pub. Pfaffikon, Switzerland, 2015 (Mat. Sci. Foundations 79 (2015)). ""Basic Phenomenological and Statistical Thermodynamics"", ""Introduction to Physical Chemistry"" and several other standard textbooks for students (in Polish). He has published in the area of solid state materials associated with crystallochemistry; structure and thermodynamics of point defects in metal oxides and sulfides; the defects and electronic structure modification for the use in electrochemical intercalation; kinetics and mechanism of catalytic and electrocatalytic reactions. Stefan S. Kurek is Assistant Professor at Cracow University of Technology in Krakow, Poland. He graduated from this University in 1974, and got his PhD in chemical technology there in 1982. He worked as postdoc in the UK, at the Universities of Birmingham and Bristol, on coordination compounds, including electron transfer from photoexcited porphyrins. Now, his research interests focus on molecular electrochemistry."