The role of adsorption C. S´ anchez and E. Leiva Volume 2, Part 1, pp 4–13 in Handbook of Fuel Cells – Fundamentals, Technology and Applications (ISBN: 0-471-49926-9) Edited by Wolf Vielstich Arnold Lamm Hubert A. Gasteiger  John Wiley & Sons, Ltd, Chichester, 2003