Abd-Elhady, Mahmoud M. ， El-Namas, Ziad E. ， Kasem, Ahmed M. ， El-Sharkawy, Ibrahim I.
2026-01-01 RENEWABLE ENERGY 2026 256(卷), null(期), (null页)
This study examines the performance of an innovative solar-powered air-based hydrogen production system (SAHP) addressing the challenges of freshwater scarcity in hydrogen production. The SAHP includes an electrolyzer that uses a hygroscopic solution to extract water vapor from ambient air, eliminating dependence on traditional freshwater sources. Experimental tests were carried out to quantify the hydrogen production rate, the absorption rate of water vapor by the hygroscopic electrolyte, the power consumption, and faradaic efficiency under various values of relative humidity and air temperature. It was found that the proposed system could produce hydrogen up to 1.365 L/h corresponding to a current density of 310 mA/cm2 under operating conditions of 25 degrees C air temperature, 80 % relative humidity and 30 %wt. acid concentration. The results also show that the system works efficiently in a wide range of climate conditions, achieving a significant hydrogen production rate with minimum energy consumption. This study presents a promising alternative for sustainable hydrogen production, especially in arid regions with solar energy resources but limited freshwater access.