Tian Tan, Ming Chen, Ji-Hu Su, Jiang-Feng Du. Temperature-Dependent Formation of Redox Sites in Molybdenum Trioxide Studied by Electron Paramagnetic Resonance Spectroscopy[J]. Chinese Journal of Chemical Physics , 2019, 32(6): 657-660. doi: 10.1063/1674-0068/cjcp1905097
Citation: Tian Tan, Ming Chen, Ji-Hu Su, Jiang-Feng Du. Temperature-Dependent Formation of Redox Sites in Molybdenum Trioxide Studied by Electron Paramagnetic Resonance Spectroscopy[J]. Chinese Journal of Chemical Physics , 2019, 32(6): 657-660. doi: 10.1063/1674-0068/cjcp1905097

Temperature-Dependent Formation of Redox Sites in Molybdenum Trioxide Studied by Electron Paramagnetic Resonance Spectroscopy

doi: 10.1063/1674-0068/cjcp1905097
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  • Corresponding author: Ji-Hu Su, E-mail: sujihu@ustc.edu.cn; Jiang-Feng Du
  • Received Date: 2019-05-16
  • Accepted Date: 2019-07-07
  • Publish Date: 2019-12-27
  • The formation and qualification of redox sites in transition metal oxides are always the active fields related to electronics, catalysis, sensors, and energy-storage units. In the present study, the temperature dependence of thermal reduction of MoO3 was surveyed at the range of 350 ℃ to 750 ℃. Upon reduction, the formed redox species characterized by EPR spectroscopy are the MoV ion and superoxide anion radical (O2-) when the reduction was induced at the optimal temperature of 300-350 ℃. When heating-up from 350 ℃, the EPR signals started to decline in amplitude. The signals in the range of 400-450 ℃ decreased to half of that at 350 ℃, and then to zero at ~600 ℃. Further treatment at even higher temperature or prolonged heating time at 500 ℃ caused more reduction and more free electrons were released to the MoO3 bulk, which results in a delocalized means similar to the anti-ferromagnetic coupling. These data herein are helpful to prepare and study the metal-oxide catalysts.

     

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