Sulfur-doped rGO aerogel enables the anchoring of 1T/2H MoS2 for durable oxygen reduction reaction catalyst support.

Durability is crucial for the long-term application of cathode oxygen reduction reaction (ORR) catalysts in fuel cells. In this work, sulfur was successfully doped into reduced graphene oxide aerogels to achieve the formation of 1T/2H hybrid phase MoS2, obtaining MoS2@S-rGO-300 composite ORR catalyst support. After loading ultrafine Pt nanoparticles, Pt/MoS2@S-rGO-300 shows not only an enhanced ORR activity, but also a significantly improved stability after 10,000 cycles. The mass activity retention for Pt/MoS2@S-rGO-300 after cycles reaches 89.94%, while that of Pt/rGO is only 37.44%. Density functional theory calculations reveal that the enlarged binding energy between Pt atoms and MoS2@S-rGO-300 leads to the prevention of Pt agglomeration as well as Ostwald ripening.