Indian research teams from S. N. Bose National Centre for Basic Sciences (SNBNCBS) Kolkata, Institute of Nano Science and Technology (INST) Mohali, and SRM University Amaravati have developed a breakthrough metal-free organic porous catalyst named TTT-DHTD that could significantly reduce the cost of next-generation clean-energy technologies. The material, prepared from 2,4,6-tris(4-aminophenyl)-1,3,5-triazine (TTT) and 4,8-dioxo-4,8-dihydrobenzo[1,2-b:4,5-b']dithiophene-2,6-dicarbaldehyde (DHTD) linkers, is built entirely from abundant elements including carbon, sulfur, nitrogen, and hydrogen and forms an ultra-porous, honeycomb-like network.
Laboratory tests demonstrated that TTT-DHTD performs at approximately 96% of the efficiency of commercial platinum catalysts in oxygen reduction reactions (ORR), which are critical for energy storage devices such as zinc-air batteries and hydrogen fuel cells. The catalyst showed remarkable stability, maintaining its performance without degradation or contamination after 120 hours of continuous operation. This addresses key challenges related to rechargeability, cycle life, and ORR kinetics that have limited zinc-air battery adoption despite their advantages over conventional lithium-ion batteries, including higher theoretical energy density, lower material cost, improved safety, and greater sustainability.
The research team used advanced computer simulations to understand the material's high performance, finding that its carefully engineered molecular structure creates ideal sites where oxygen molecules can readily attach and react, enabling efficient electricity generation. This development could dramatically reduce the cost of zinc-air cells by replacing expensive platinum, making clean transportation, portable power systems, and renewable energy storage more affordable and accessible. The findings were published in the journal Science Advances, highlighting India's growing leadership in sustainable materials research.