EDITORIAL i J. Electrochem. Sci. Eng. 6(1) (2016) i-ii Open Access : : ISSN 1847-9286 www.jESE-online.org EDITORIAL This Special Issue of the Journal of Electrochemical Science and Engineering presents papers form the Fifth Regional Symposium on Electrochemistry – South East Europe (RSE-SEE5) held in Pravetz, Bulgaria, June 7-11, 2015. Following the 20 th century traditions of the strong Regional Electrochemical Schools and their excellent networking, the four successful Symposium meetings in Croatia (Red Island, 2008), Serbia (Belgrade, 2010), Romania (Bucharest, 2012) and Slovenia (Ljubljana, 2013) have built a strong and solid base for the fulfillment of the 5th edition mission - to contribute to the excellence in electrochemical science as part of the European Research Area. RSE-SEE5 crossed regional borders, creating a common platform for scientists and experts from regional and international research and industrial institutions who brought their extensive knowledge, novel ideas, and boundless enthusiasm to the conference venue, presenting 77 talks (6 plenary, 17 keynote) and 88 posters. The fifth edition of the Symposium will be remembered with a Scientific Committee represented by members from 17 countries of the South East Europe region with the special “brokerage” session aiming to initialise common projects, with the decision for accepting the Journal of Electrochemical Science and Engineering as the official Proceedings Journal of RSE-SEE. This action ensured the submission of papers to become open for all authors, independent of the form of presentation – oral or poster. However, the most memorable Symposium event was the official establishment of the Association of South-East European Electrochemists (ASEE), aiming to contribute to the advancement of the fundamental and applied research in the field of electrochemistry and to enhance the regional scientific communication and cooperation. We would like to acknowledge the financial support of the International Society of Electro- chemistry, the Bulgarian Ministry of Education and Science, The Bulgarian Academy of Sciences, the Institute of Electrochemistry and Energy Systems at the Bulgarian Academy of Sciences, the Organisation for the Prohibition of Chemical Weapons, DropSence and PalmSence which ensured 15 awards for young scientists covering their conference registration fees. We wish to express our gratitude to the members of the Scientific and Organising Committees for their unrelenting dedication and support and the commendable decision to incorporate the national event Sofia Electrochemical Days into the Symposium. http://www.jese-online.org/ J. Electrochem. Sci. Eng. 6(1) (2016) i-ii ii We would like to sincerely thank the authors for their contribution, the reviewers for their commitment and professional work and the jESE-Editorial Office for their invaluable assistance in the Proceedings publication. We wish the Hungarian electrochemists community successful organisation of the RSE-SEE 6 in Hungary, where we shall meet again in 2017. Guest Editors: Co-chairs of RSE-SEE 5: Daria Vladikova Daria Vladikova Gergana Raikova Zdravko Stoynov