This book focuses on the fundamentals of the plasma modification techniques, polymer electrolyte membrane fuel cells, and how plasma techniques can be utilized to improve the efficiency of the fuel cells. Platinum/Carbon is used as a catalyst for fuel cells and the objective of this study is to modify the carbon support to improve the catalytic efficiency of fuel cell electrocatalysts. A radio-frequency tumbling plasma reactor is used to modify the carbon support to have uniform coating on the carbon nanoparticles without affecting its bulk properties. Nitrogen and allylamine plasmas are used...