Polymer electrolyte membrane fuel cell (PEMFC) is one of the challenging energy conversion devices for transportation and distributed power generation systems due to its attractive features such as high power density, low operating temperature, minimal emissions, negligible noise, and high efficiency. The success of the PEMFC technology is largely influenced by bipolar plate as well as electrocatalyst support apart from other components. This book covers the detailed methodology for synthesis and characterization of graphene. The synthesized monolayer graphene is investigated as reinforcement into the carbon-polymer composite bipolar plate. The developed optimized composite bipolar plate is evaluated for high temperature PEMFC (HT-PEMFC) application. Moreover, the graphene is used as an electrocatalyst support to enhance the electrochemical activity of PEMFC electrocatalyst. The state of the art information for the development and performance evaluation of PEMFC is discussed in detail. The information presented in this book will be helpful to the researchers, academicians, and manufacturers for the development of efficient bipolar plate and electrocatalyst for PEMFC.