Pumpless thermal management of water-cooled high-temperature proton exchange membrane fuel cells

► A stack cooling device for a high-temperature PEMFC has been designed. ► It is operated using latent heat of water without any external driving power. ► The designed cooling device was verified with 1 kWe class HT PEMFC stack. ► The HT PEMFC stack temperature can be kept within ±3 °C of the target temperature.