Focusing on recent developments in innovative energy conversion, this second volume features emerging applications with the capacity to transform the entire energy economy. Specific examples include the development of sulfonated polyarylether-type polymers as proton exchange membranes for high- and medium-temperature polymer electrode fuel cells (PEFC), with an entire section devoted to the rapidly expanding field of materials development for solid oxide fuel cells (SOFC). The result is a detailed and invaluable source of information for those involved in the chemical, material science and engineering fields of power generation.