Electrocatalytic reduction of O2 by a Cu(II)-substituted electron-rich wheel-type oxomolybdate nanocluster

Israel M. Mbomekallé, Fang Bian, Henry Tebba, Achim Müller, Ira A. Weinstock

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Catalysis of electron transfer by a Cu-substituted wheel-type oxomolybdate cluster-anion, [(H4Cu5II)Mo28 VMo114VIO432(H2O) 58]26-, {Mo142Cu5}, (1), is demonstrated. Data provided include aqueous-solution chemistry (stability) studies of 1 and [Mo28VMo114VIO 432(H2O)58H14]26-, {Mo142}, (2), derivatives of the "plenary" {Mo 154} anion, [Mo28VMo126 VIO462(H2O)70H14] 14-, (3). Combined use of cyclic voltammetry and UV-vis spectroscopy shows that, while both 1 and 2 appear to be stable in solution at pH 0.33 (0.5 M H2SO4), 1 is more stable than 2 at pH 3 (in 0.2 M Na 2SO4). Cyclic voltammetric analysis in the presence of O2 shows that 1 is an electrocatalyst for electron transfer to O 2. Bulk electrolysis of 1 in the presence of O2 (ca. 1 mM) is used to assess catalyst stability under turnover conditions, and to demonstrate that the final product of electrocatalytic reduction is water, rather than H2O2. Finally, control experiments using 1, 2, and CuSO4 (no oxomolybdate-cluster present), show that catalytic activity is due to specific interaction(s) between Cu ions and the Mo 142 type oxomolybdate structure of 1.

Original languageEnglish
Pages (from-to)333-348
Number of pages16
JournalJournal of Cluster Science
Issue number2
StatePublished - 1 Jun 2006
Externally publishedYes


  • Catalysis
  • Copper
  • Nanocluster
  • Oxomolybdate
  • Oxygen

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry (all)
  • Materials Science (all)
  • Condensed Matter Physics


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