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The success of the ﬁrst edition of Fuel Cell Systems Explained has been shown both by very pleasing sales and the positive comments of reviewers and critics. Nevertheless, with fuel cell technology, no one can rest on their laurels, and the last few years have seen rapiddevelopments in the ﬁeld, making a second edition necessary. Although the basic principles of fuel cells remain the same, this new edition provides the opportunity to describe some of the signiﬁcant developments that have emerged over the past three years. Examples are to be found in both low- and high-temperature fuel cell types. In particular, we have expanded our descriptions of the DirectMethanol Fuel Cell, which has an entirely new chapter of its own (Chapter 6), and the Intermediate Temperature Solid Oxide Fuel Cell, which forms part of an expanded description of hightemperature fuel cells (Chapter 7). We have substantially updated other chapters including those concerning the proton exchange membrane fuel cell (Chapter 4) and fuel processing (Chapter 8). In the latter case, new...