Nanosized manganese oxide/holmium oxide: A new composite for water oxidation

Mohammad Mahdi Najafpour, Saeideh Salimi, Zahra Zand, Małgorzata Hołyńska, Tatsuya Tomo, Jitendra Pal Singh, Keun Hwa Chae, Suleyman Allakhverdiev

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Abstract

Herein, holmium oxide as a support for nanosized Mn oxide was used toward the synthesis of a new catalyst for water oxidation. A composite of Mn and Ho oxide was synthesized by a simple hydrothermal procedure and characterized by scanning electron microscopy, extended edge X-ray absorption fine structure, transmission electron microscopy, powder X-ray diffraction and electrochemical methods. The effect of calcination temperature on the composite performance for the water-oxidation process was examined in the range of 100-600 °C. The turnover frequencies for the catalyst toward water oxidation in the presence of cerium(iv) ammonium nitrate and photo-produced tris(2,2′-bipyridyl)ruthenium(iii), [Ru(bpy)3]3+ are 0.12 and 0.04 (mmol O2 per mol Mn s), respectively. In addition, the catalyst shows self-healing in the presence of cerium(iv) ammonium nitrate and under the water-oxidation conditions.

Original languageEnglish
Pages (from-to)13732-13741
Number of pages10
JournalNew Journal of Chemistry
Volume41
Issue number22
DOIs
Publication statusPublished - Jan 1 2017
Externally publishedYes

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

Cite this

Najafpour, M. M., Salimi, S., Zand, Z., Hołyńska, M., Tomo, T., Singh, J. P., Chae, K. H., & Allakhverdiev, S. (2017). Nanosized manganese oxide/holmium oxide: A new composite for water oxidation. New Journal of Chemistry, 41(22), 13732-13741. https://doi.org/10.1039/c7nj02747h