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

Tian Tan; Ming Chen; Ji-Hu Su; Jiang-Feng Du

doi:10.1063/1674-0068/cjcp1905097

Volume 32 Issue 6

Dec. 2019

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Article Navigation > Chinese Journal of Chemical Physics > 2019 > 32(6): 657-660

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

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

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

doi: 10.1063/1674-0068/cjcp1905097

Tian Tan^a,b,c,
Ming Chen^a,b,c,
Ji-Hu Su^{a,b,c
,
,},
Jiang-Feng Du^{a,b,c
,}

a.
Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
b.
Chinese Academy of Sciences Key Laboratory of Microscale Magnetic Resonance, University of Science and Technology of China, Hefei 230026, China
c.
Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

More Information

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

Abstract

Abstract

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 Mo^V 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.
- MoO₃,
- Thermal reduction Mo^V,
- Superoxide anion radical,
- Electron paramagnetic resonance spectroscopy

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References(19)

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