This volume is part of a continuing series that provides authoritative reviews on recent developments and applications of well-established techniques in the field of electroanalytical chemistry. Each volume provides the necessary background and starting point for graduate students undertaking related research projects and is of special interest to practicing analytical chemists concerned with electroanalytical techniques. Volume 27 continues this tradition with innovative contributions from internationally respected scientists who highlight new technologies and trends in Protein Biosensing, Bipolar Electrochemistry, and X-ray Absorption Spectroscopy in Electrochemistry.