Direct alcohol fuel cells (DAFCs) have been studied since 1962 . They are thought to be the replacement candidates for H2/O2 fuel cells in some application elds, such as portable devices, signal devices, emergency power generators, etc., due to their unique advantages of high safety and high energy density. Moreover, DAFCs are receiving more and more attention because of more and more personal portable devices and more serious environment and energy problems . Figure 13.1 shows that the number of papers related to direct methanol fuel cells (DMFCs) obviously ies up from 1990, and the number of published papers even rises over 2000 during the period from 2009 to 2010. The total number has already been more than 2000 during the period from 2011 to October 2012.