China’s new fermentation system delivers 33% more biohydrogen while capturing carbon dioxide

Chinese researchers developed a dark fermentation method that boosts biohydrogen output by about 33%.

They added wollastonite to buffer pH, improve microbial activity, and capture CO2 during production.

The process uses a two-stage setup to balance higher hydrogen yield with later carbonation for long-term storage.

Captured carbon is mineralized as calcium carbonate, pointing to a more climate-friendly, negative-carbon hydrogen pathway.