Light-Driven Reversible Hydrogen Storage in Light-Weight Metal Hydrides Enabled by Photothermal Effect.

Area of Science:

• Materials Science
• Chemical Engineering
• Renewable Energy

Background:

• High temperatures required for hydrogen storage in light metal hydrides limit their practical application.
• Traditional electric heating methods are energy-intensive and costly.

Purpose of the Study:

• To develop a light-mediated catalytic strategy for efficient hydrogen storage in light metal hydrides.
• To overcome the limitations of high-temperature requirements for hydrogen release and uptake.

Main Methods:

• Fabrication of TiO2 nanoparticles uniformly distributed on carbon nanosheets (TiO2@C) to couple catalytic and photothermal effects.
• Utilizing NaAlH4 as the target material for light-driven hydrogen storage under irradiation.
• Testing the strategy with other light metal hydrides like LiAlH4 and MgH2.

Main Results:

• Complete hydrogen release from NaAlH4 within 7 minutes under 10 suns light intensity.
• Achieved 4 wt% reversible hydrogen storage capacity after 10 cycles with 85% retention under light irradiation.
• Demonstrated the universality of the strategy for LiAlH4 and MgH2.

Conclusions:

• A light-mediated catalytic strategy effectively drives reversible hydrogen storage in light metal hydrides.
• This approach offers an alternative to electric heating, enabling efficient hydrogen storage systems powered solely by light.