Abstract:
Portable power source based on air-hydrogen fuel cells (FCs) operating in a free-breathing cathode regime has been developed. At a volume of 100 cm$^3$, the source has a power capacity of 8.5 W h and generates a power of 2 W that is independent of the temperature within 5–40$^\circ$C and the relative humidity of the ambient air within 40–98%. With respect to the specific energy characteristics, the proposed PTI type device exceeds other air-hydrogen FCs and in some respects is even superior to power sources based on air-methanol FCs.