2. Air-Cooled Self-humidifying PEMFC & Test PlatformAir-cooled self-humidifying PEMFC is cathode open stack. Itoffers oxygen to the stack by fan, and exhausts the extra heat produced by the stack[16].2.1. Working PrincipleH2 and air are the fuel and oxidant for the air-cooled selfhumidifying PEMFC, and they take part in the electrochemical