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Updated: Aug 29, 2025

Hydrogen Production and Utilization in a Membrane Reactor
Published on: March 10, 2023
Hydrogen production from the air
Jining Guo1, Yuecheng Zhang1, Ali Zavabeti1
1Department of Chemical Engineering, The University of Melbourne, Parkville, Vic, 3010, Australia.
Abstract:
Green hydrogen produced by water splitting using renewable energy is the most promising energy carrier of the low-carbon economy. However, the geographic mismatch between renewables distribution and freshwater availability poses a significant challenge to its production. Here, we demonstrate a method of direct hydrogen production from the air, namely, in situ capture of freshwater from the atmosphere using hygroscopic electrolyte and electrolysis powered by solar or wind with a current density up to 574 mA cm-2. A prototype of such has been established and operated for 12 consecutive days with a stable performance at a Faradaic efficiency around 95%. This so-called direct air electrolysis (DAE) module can work under a bone-dry environment with a relative humidity of 4%, overcoming water supply issues and producing green hydrogen sustainably with minimal impact to the environment. The DAE modules can be easily scaled to provide hydrogen to remote, (semi-) arid, and scattered areas.
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