Nano Ce2O2S with Highly Enriched Oxygen-Deficient Ce3+ Sites Supported by N and S Dual-Doped Carbon as an Active Oxygen-Supply Catalyst for the Oxygen Reduction Reaction

• DOI: 10.1021/acsami.7b04997
• Publication Date: 2017-06-19T10:02:00Z
• Authors: Liu Yang; Zhuang Cai; Liang Hao; Zipeng Xing; Ying Dai; Xin Xu; Siyu Pan; Yaqiang Duan; Jinlong Zou
• Keywords: Carbon fibers

The design of rare-earth-metal oxide/oxysulfide catalysts with high activity and durability for the oxygen reduction reaction (ORR) is still a grand challenge at present. In this study, Ce-species (Ce2O2S/CeO2)/N, S dual-doped carbon (Ce-species/NSC) promising storage/release capacities are prepared different temperatures (800-1000 °C) to enhance ORR efficiency. Mechanisms effects temperature on crystalline phase transition between CeO2 Ce2O2S structure evolution Ce-species/NSCs inferred better understand their catalytic activity. Porous Ce2O2S/NSC (950 catalyst as air-breathing cathode exhibits maximum power density 1087.2 mW m-2, which higher than those other commercial Pt/C (989.13 m-2) in microbial fuel cells. decline 8.7% after 80 days operation, far lower that (36.7%). has four-electron selectivity toward low charge-transfer resistance (5.49 Ω), contributing durability. attributed its specific surface area (338.9 m2 g-1), varied active sites, electrical conductivity, sufficient vacancies skeleton. content Ce3+ facilitates formation more oxygen-deficient sites generate release/store stabilize available ORR. Thus, study provides new perspective preparation application type catalyst.