Injecting CO2 underground can accelerate natural (geologic) hydrogen production through serpentinization. However, it presents a delicate balancing act. The study reveals that the optimal environments require specific geological and thermal criteria, as the added CO2 can trigger chemical reactions that clog rock pores faster than water alone.

Injecting CO2 underground can accelerate natural (geologic) hydrogen production through serpentinization. However, it presents a delicate balancing act. The study reveals that the optimal environments require specific geological and thermal criteria, as the added CO2 can trigger chemical reactions that clog rock pores faster than water alone. 
The delicate interplay between conditions and outcomes involves:
The Right Rocks: -
The process relies on ultramafic rocks (rich in iron and magnesium, such as olivine) where water and CO2 trigger oxidation to release hydrogen gas. 
The Pore-Clogging Risk: -
While beneficial for generating hydrogen and sequestering carbon, the chemical reactions can rapidly plug the rock's pore spaces. This restricts the fluid movement required to sustain the reaction, effectively choking off hydrogen output over time. 
Temperature Dependencies: -
The acceleration of hydrogen release and the rate of pore-clogging are highly sensitive to subsurface temperatures, meaning the method is strictly viable within specific geothermal ranges. 
For a deeper look into the mechanics of this research, you can explore the full findings published in the Hydrogen Insight report. 
The differences between natural (geologic) hydrogen and other types of clean energy.
Information on real-world test sites and global occurrences of natural hydrogen. 
Underground CO₂ injection could boost geologic hydrogen production
 Underground CO₂ injection could boost geologic hydrogen production — but only in the right rocks and at the right temperatures.

MJF Lion ER YK Sharma 

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