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Thermal stabilization of tin- and cobalt-doped manganese dioxide

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Abstract

We study the thermal stability, local structure, and electrical properties of the α-MnO2 phase doped with Sn and Co. It is found that doping prevents the transformation from α-MnO2 to α-Mn2O3 that occurred in the temperature range of 500–600 °C. Samples have been synthesized in an acidic medium using the reduction of potassium permanganate by fumaric acid. X-ray diffraction patterns (XRD) of pure and doped α-MnO2 prepared at 450 °C do not show new peaks related to dopant species. Thermogravimetric analysis (TGA) of the Sn and Co doped MnO2 reveals that transformation from MnO2 to α-Mn2O3 starts above 700 °C. The increase in the thermal stability is attributed to the presence of Sn or Co ions incorporated inside the large 2 × 2 tunnels as revealed by Fourier transform infrared (FTIR) spectra measurements. An increase in the electrical conductivity with the presence of Sn or Co ions is observed. Electrochemical features of the doped MnO2 samples in alkaline cells are reported and compared with that of the pristine α-MnO2 phase.

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Acknowledgments

The authors are grateful to Dr A. Mauger for fruitful discussions. We thank M. Selmane for his assistance in the XRD measurements. This work was done in the frame of the Franco-Egyptian collaborative program OMHOTEP (grant No. 12454NE).

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Authors and Affiliations

  1. Inorganic Chemistry Department, National Research Centre, Behoos Street, Dokki, Cairo, Egypt

    A. M. A. Hashem, H. A. Mohamed & A. E. Eid

  2. Laboratoire d’Electrochimie d’Ingéniérie Moléculaire et de Catalyse, Université de Sétif, 19000, Sétif, Algeria

    A. Bahloul

  3. Institut des Nano-Sciences de Paris, UMR 7588, Université Pierre et Marie Curie, 140 rue de Lourmel, 75015, Paris, France

    C. M. Julien

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  1. A. M. A. Hashem
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  2. H. A. Mohamed
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  3. A. Bahloul
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  4. A. E. Eid
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  5. C. M. Julien
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Correspondence to C. M. Julien.

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Hashem, A.M.A., Mohamed, H.A., Bahloul, A. et al. Thermal stabilization of tin- and cobalt-doped manganese dioxide. Ionics 14, 7–14 (2008). https://doi.org/10.1007/s11581-007-0138-3

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  • DOI: https://doi.org/10.1007/s11581-007-0138-3

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