Editing an encyclopedia has already been a formidable task in the not too distant past—it is an even more difficult task today. Thus it is not surprising to realize that an encyclopedia covering electrochemistry, an extremely diverse and multidisciplinary area of research and development, has not been published again after the “Encyclopedia of the Electrochemistry of the Elements” that has been finished decades ago by A.J. Bard—and this work actually covered only very selected and limited areas of the field. Thus the present volume, being a part of an eleven-book enterprise, attempts to be a building block of a work standing in the tradition of famous predecessors (e.g.. Encyclopédie by D. Diderot and J. d’Alembert 1751–1775). A certainly very challenging task is a complete overview of experimental methods including both traditional (classical) and nontraditional (e.g. spectroscopic or surface analytical) methods because of the extremely large number of methods in particular in the...