Electrocatalysts for hydrogen fuel cell cathodic oxygen reduction

Hydrogen fuel cell as a power generating device converts chemical energy into electrical energy, with the advantages of high energy conversion efficiency, low noise, no pollution, diverse raw materials, and wide use．However, slow cathodic oxygen reduction (ORR) kinetics severely limits large-scale applications and advanced development．Therefore, the efficient, durable and economical electrocatalysts for oxygen reduction reaction is of vital importance．Here we review the three mainstream ORR electrocatalysts (precious metal ORR electrocatalysts, non-precious metal ORR electrocatalysts, and carbon-based ORR electrocatalysts), with a focus on performance, advantages and disadvantages of different catalyst systems．We discuss synthesis strategy of high-performance ORR electrocatalyst and future research directions．