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… Click to show full abstract
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.
               
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