This book provides the latest information and methodologies of rotating disk electrode and rotating ring‎-disk electrode ‎(‎rde/rrde‎)‎ and oxygen reduction reaction ‎(‎orr‎)‎‎.‎ It is an ideal reference for undergraduate and graduate students‎,‎ scientists‎,‎ and engineers who work in the areas of energy‎,‎ electrochemistry science and technology‎,‎ fuel cells‎,‎ and other electrochemical systems‎.‎ * presents a comprehensive description‎,‎ from fundamentals to applications‎,‎ of catalyzed oxygen reduction reaction and its mechanisms* portrays a complete description of the rde ‎(‎rotating disc electrode‎)‎/rrde ‎(‎rotating ring‎-disc electrode‎)‎ techniques and their use in evaluating orr ‎(‎oxygen reduction reaction‎)‎ catalysts* provides working examples along with figures‎,‎ tables‎,‎ photos and a comprehensive list of references to help understanding of the principles involved