The progress of research on polymer nanofibers, progressively becoming developed in last two decades, has become specifically applicable and instant in most recent years. Polymer nanofibers are today a particular important topic in the scientific and technical literature, transversal to many fields of nanotechnology. Among these, application of nanofibers in fuel cell has implanted a boon for green fuel source. The fuel cells are devices which having ability to converts the chemical energy of a fuel such as hydrogen directly into electrical energy by applying a catalyst. Fuel cells are used in space programs. This book is a short introductory application of fuel cell which are produced by nanofibers.