covers the design, synthesis and performance efficacies of the entire spectrum of oxygen reduction catalysts, extrapolating down to their applications in practical, alternative, renewable energy devices. Catalysts covered include heme inspired iron-based, heme inspired non-iron-based, non-heme-based, noble metal-based, non-noble metal-based and metal-free homogeneous and heterogeneous catalysts. The book contains critical analyses and opinions from experts around the world, making it of interest to scientists, engineers, industrialists, entrepreneurs and students.