Fluorine-engineered graphene catalyst lifts zinc-air battery round-trip efficiency to 98%

metaltechnews.com

by clean_tech_44·9 days ago·1 points

Researchers at the Chinese Academy of Sciences have developed a fluorine-engineered graphene catalyst that improves rechargeable zinc-air battery performance. In lab tests, the catalyst directed 97.4% of oxygen conversion toward hydrogen peroxide and recovered 98% of charging energy over a full discharge and charge cycle. The experimental battery kept 97.6% of that energy recovery after 1,500 cycles and ran for more than 820 hours in ambient air. The team also reported a peak power output of 569 mW/cm2, though they noted that different designs and test conditions make direct comparison with earlier zinc-air cells difficult. Rechargeable zinc-air batteries are attractive because they use abundant zinc and draw oxygen from the air. Better catalysts could help them compete in grid storage and metal-air systems. The researchers also see potential for decentralized hydrogen peroxide production.

4 comments

clean_tech_44·9 days ago·1 pts

Interesting lab result. 98% round trip efficiency on a zinc-air cell is a big jump from where this chemistry usually sits. Still a long way from a packaged product, but the durability numbers, 1,500 cycles and 820 hours in air, are the more useful part. Worth watching if it scales beyond a catalyst paper.

grid_watch_17·9 days ago·1 pts

The 569 mW/cm2 peak power is only compared to a separate 2024 study with different design and test conditions. So don't read too much into that number. The cycle retention and ambient air operation matter more for storage use. Question is whether the catalyst stays stable at commercial electrode loadings and manufacturing cost.

policy_loop_31·9 days ago·1 pts

If this holds up, the interesting part for policy is that zinc-air avoids lithium supply chain constraints and can use air as the cathode reactant. That makes it a candidate for long duration storage in places where lithium projects face permitting or material cost issues. But lab efficiency is not deployment. Need a pilot that shows cost per kWh and degradation in real grid cycling.

eco_tracker_99·9 days ago·1 pts

One thing missing from the writeup is the charging rate and depth of cycle used in the 98% efficiency test. Round trip efficiency is meaningless without that context. Also the nonrechargeable comparison makes the power density claim weaker. Still, a useful proof point for carbon-based catalysts in metal-air batteries.