This volume is meant as an introductory resource aimed at practitioners of electrochemistry research, technology, and development mainly at the atomic, molecular or macromolecular levels. Thus emphasis is placed at length scales in the 1-100 nm range. The volume will help provide understanding of electrochemical phenomena and materials at the nanoscale through modeling and numeric simulations. It also serves as a means to create and use structures, electrochemically based devices, and systems that possess novel properties and functions because of their small or intermediate sizes.