Chemists at Kyushu University discovered a simple method to produce hydrogen gas by irradiating a mixture of methanol, sodium hydroxide, and iron chloride with UV light.
The reaction yields 921 millimoles of hydrogen per hour per gram of iron chloride catalyst, matching the efficiency of conventional catalysts.
Unlike current methods, this process requires only an iron ion as catalyst instead of complex and expensive organometallic systems.
The researchers found the reaction by accident during a control experiment intended to study hydrogen production using metal-organic frameworks.
Methanol, which can be produced from water and atmospheric CO2 via Power-to-Liquid or Sun-to-Liquid processes, serves as a practical hydrogen carrier due to easier storage and transport compared to pure hydrogen gas.
Efficient dehydrogenation of methanol remains a bottleneck for its use as a hydrogen intermediate, as traditional techniques rely on costly catalysts.
The new method uses UV light to trigger the reaction, with iron ions facilitating the removal of hydrogen from methanol.
Senior author Takahiro Matsumoto said the team initially doubted the results but validated them through repeated experiments.
The scientists state their system represents the first known example of hydrogen generation from methanol using only a metal ion.
How the discovery could affect hydrogen production costs
If scaled, the technique may lower expenses for green hydrogen by avoiding expensive catalysts like platinum or iridium.
Current hydrogen production often depends on rare and pricey materials, contributing to higher overall costs in the energy transition.
Simpler catalysis could make decentralized hydrogen generation more feasible for industrial or regional applications.
What challenges remain before practical use
The process requires UV light, which may limit efficiency under natural sunlight and necessitate artificial light sources.
Researchers did not specify the wavelength or intensity of UV used, leaving questions about energy input requirements.
Long-term stability of the iron chloride catalyst and methanol solution under repeated cycles was not addressed in the source.
Why is methanol used as a hydrogen carrier?
Methanol is easier to store and transport than hydrogen gas because We see liquid at ambient conditions and has higher energy density.
What role do iron ions play in the reaction?
Iron ions act as catalysts that enable the dehydrogenation of methanol when the mixture is exposed to UV light.
