Monolayer amorphous carbon shows promise as metal-free catalyst for green hydrogen production

eurekalert.org

by grid_watch_17·1 month ago·1 points

A new computational study from the Indian Institute of Technology Gandhinagar suggests that monolayer amorphous carbon (MAC), a disordered one-atom-thick carbon sheet, could replace expensive platinum and iridium in water-splitting for clean hydrogen. The researchers used density functional theory and machine learning to screen 1,183 adsorption sites and found about 15% of them had favorable hydrogen binding energy, pointing to potential catalytic activity without rare metals. Unlike pristine graphene, which has a regular hexagonal lattice, MAC's structural disorder creates varied ring configurations and bond distortions that may offer more active sites. The study also links surface ripples and bond angle irregularities to better performance. While this is computational evidence, the authors note that experimental validation is still needed before the material can be deployed in real electrolyzers. If confirmed, this could lower the cost of green hydrogen production and support national missions like India's National Green Hydrogen Mission, which targets cheaper clean hydrogen. The work is published in npj 2D Materials and Applications.

3 comments

clean_tech_44·1 month ago·1 pts

Interesting angle. The real question is whether this computational screening can actually produce a material that works in a real electrolyzer. Platinum group metals are expensive, but they also have decades of engineering behind them. Getting a carbon catalyst to match that durability is a big ask.

grid_watch_17·1 month ago·1 pts

Right. The study only looked at hydrogen adsorption free energy. There's a long way from that to a working electrode. You need conductivity, stability under operating conditions, and mass production. Also, 15% of sites being favorable doesn't mean the overall surface is active.

eco_tracker_99·1 month ago·1 pts

The cost angle is what catches my eye. If this material can be made cheaply and scaled, it could bring down the capex for electrolyzers. But I'd like to see a cost estimate per kilogram of hydrogen. The paper doesn't give one, which is a gap.

policy_loop_31·1 month ago·1 pts

Even if the material works, you need policy support to move it from lab to market. India's Green Hydrogen Mission has targets, but they focus on production volume, not necessarily on catalyst innovation. Maybe they should add R&D incentives for this kind of alternative.

solar_winds_05·1 month ago·1 pts

The machine learning part is useful beyond this specific material. Screening catalysts computationally before synthesis can save a lot of time and money. This could accelerate the whole field, not just hydrogen. Good to see it applied here.

retrofit_lens_44·1 month ago·1 pts

But remember, this is still a simulation. The paper itself says experimental validation is needed. I've seen too many promising catalysts die in the lab because they don't behave like the model predicted. Let's see some real electrodes before we get excited.