Hydrogen burns clean. Just water comes out of the pipe. No smog. No warming.
That is the dream. The problem? Almost all hydrogen today is cooked from fossil fuels. We burn methane to get it. Which defeats the whole purpose.
Making it from renewable electricity—splitting water with wind or solar—works but costs a fortune. It also eats up green energy we might need for other things. Like replacing coal plants.
So scientists are looking down.
Researchers at the University of Texas think rocks hold the answer. Specifically deep underground ones.
The idea is simple on paper. Pump water into volcanic rock. Let the rock react. The chemistry produces hydrogen. But here is the twist: pump CO2 down there with it. The gas reacts with the rock to form carbonates.
Permanent storage. Clean fuel. Two birds, one stone.
Orsolya Gelencsér and her team proved it in the lab.
The Lab Test
They took iron-rich volcanic rock. Pressurized it. Heated it to 90° Celsius. Then added water laced with CO2.
The acid in the CO2 ate into the rock. Opened it up. Water got in. Reaction started.
Hydrogen popped out.
They compared it to a control group using inert argon. The CO2 mix produced more gas. Why? The acid made the rock more reactive.
They got 0.5 percent of the theoretical yield. Low? Yes. But if they push it to 1 percent it might work. Going deeper helps. Higher temperatures speed up the chemical reaction called serpentinisation.
And depth means heat. Lots of it. Maybe enough to run a geothermal turbine too.
“We hope to demonstrate that we will beable to generate hydrogen economically while sequesteruing CO2,” says Gelencsér
She wants to leave the lab now. Partner with companies. Try this on field sites.
Not a Natural Fix
Nature makes hydrogen on its own sometimes.
Bourakébougou in Mali pumps some up from a tiny well. Pure stuff. Rare stuff. But you cannot scale this. The molecules are too small. They escape. Rock doesn’t trap them well.
Most natural deposits are limited. If they exist at all in big quantities.
That is why the push is now toward stimulated production. Make it happen. Force the chemistry.
There is plenty of iron-rich rock out there. Even at that sluggish 1 percent efficiency the math suggests we could outproduce current global hydrogen output. Currently about 100 million tones.
Is it viable? We don’t know.
Carbfix is already doing CO2 mineralisation in Iceland. They sell carbon storage credits. That revenue makes projects sexy for investors. Patonia from Oxford notes this creates a feedback loop. More money. More interest.
Barbara Sherwood Lollar likes the work but warns against putting all eggs in one basket.
There are pockets of natural hydrogen right here. A mine in Timmins Ontario leaks 140 tonnes a year. Capture that. It’s free energy leaking into the air.
No silver bullet.
Every method needs a try. The lab works. The rock is waiting. The clock is ticking.
Whether we drill deep or tap the shallow leaks we need to move.
