Laser-Induced Methanol Decomposition for Ultrafast Hydrogen Production

Area of Science:

• Physical Chemistry
• Materials Science
• Energy Conversion

Background:

• Methanol (CH₃OH) is a liquid hydrogen (H₂) source, but traditional thermocatalytic reforming requires high temperatures and emits CO₂.
• Existing photocatalytic and photothermal methods for H₂ production from methanol still produce CO₂, hindering carbon neutrality goals.
• Current catalytic methods for H₂ production from methanol are limited by reaction conditions and CO₂ byproducts.

Purpose of the Study:

• To report a novel, catalyst-free method for ultrafast and highly selective hydrogen production from methanol.
• To achieve hydrogen generation without carbon dioxide emissions under mild conditions.
• To investigate the underlying mechanisms of laser-driven hydrogen production in liquid methanol.

Main Methods:

• Developed a laser bubbling in liquid (LBL) process for direct methanol decomposition.
• Operated the process at room temperature and atmospheric pressure without external catalysts.
• Analyzed hydrogen yield, selectivity, and energy conversion efficiency.

Main Results:

• Achieved an ultrafast hydrogen yield rate of 33.41 mmol·h⁻¹ with 94.26% selectivity.
• Demonstrated a hydrogen yield rate three orders of magnitude higher than previous photocatalytic and photothermal methods.
• Reported a laser light to H₂ and CO energy conversion efficiency of up to 8.5%.

Conclusions:

• Laser bubbling in liquid is a groundbreaking method for efficient, selective, and clean hydrogen production from methanol.
• The process relies on high-temperature, non-equilibrium conditions within laser-induced bubbles and rapid bubble quenching kinetics.
• This catalyst-free approach offers a promising alternative to conventional methods, advancing sustainable hydrogen energy solutions.