This book presents current research in the field of electrochemistry. Topics discussed include advanced materials for wet electrochemical detection of organic impurities; electrochemical applications of modified electrodes in waste water treatment and energy conversion systems; electrochemical hydrogen storage; application of high temperature electrolysis for large-scale hydrogen production; electrolysis of nitrate aqueous solution; electrocoagulation and electroflotation; voltage stabilization using a storage capacitor and physical and electrochemical properties of quaternary ammonium salts.