This book is a compilation of research works on electrochemistry in the broadest of its meanings, carried out by Spanish and Portuguese researchers around 2019. It aims to collect the most significant of our research and to show the excellent level that these works have in comparison with the international state of the art. The selection of works, in an extended abstract format, is based on the papers presented as invited plenary conferences and keynote oral communications at the XL Meeting of the Specialized Electrochemistry Group of the Spanish Royal Society of Chemistry and the XX Iberian Electrochemistry Meeting, which took place in the city of Huelva (Spain) between 9th and 12th July 2019. In an attempt to cover the work of Iberian electrochemists in the most complete and representative way possible, several invited chapters have been added to this set of works. On some occasions, the authors have reported on potential legal problems regarding the publication rights of their work, mainly due to the high interest in their results and the fact that they had already been submitted to very high impact journals for publication. In this case, they have been allowed to replace their original work by a mini review of their laboratory's line of research, keeping as much as possible the same research topic.