SiW11Fe@ MIL-101(Cr) Composite: A Novel and Versatile Electrocatalyst

Diana M. Fernandes, Carlos M. Granadeiro, Patrícia de Mira Paes de Sousa Videira, Raquel Grazina, Jose J. G. Moura, Patricia Silva, Filipe A. Almeida Paz, Luis Cunha-Silva, Salete S. Balula, Cristina Freire

Research output: Contribution to journalArticle

Abstract

A novel composite is prepared by the incorporation of the iron-substituted silicotungstate [SiW11FeIII(H2O)O-39](5) (SiW11Fe) into the 3D structure of MIL-101(Cr). Pyrolytic graphite electrodes are modified with SiW11Fe and the composite material SiW11Fe@MIL-101, and the electrochemical behavior of the electrodes is studied by cyclic voltammetry. The SiW11Fe-modified electrode shows three reduction processes: the peak at more positive potentials is assigned to Fe-III -> FeII and the other two peaks to WVI ! WV processes. The SiW11Fe@ MIL-101-modi-fied electrode shows, besides the redox processes assigned to SiW11Fe, an additional peak from the MIL-101(Cr) matrix, which corresponds to CrIII ! CrII reduction. The SiW11Fe@ MIL-101-modified electrode shows excellent tungsten-based electrocatalytic activity towards nitrite and iodate reduction, and chromium- based electrocatalytic properties towards ascorbic acid oxidation. It, thus, ultimately proves to be a modified electrode with multi-electrocatalytic properties.

Original languageEnglish
Pages (from-to)1293-1300
Number of pages8
JournalChemelectrochem
Volume1
Issue number8
DOIs
Publication statusPublished - 12 Aug 2014

Keywords

  • electrocatalysis
  • microporous materials
  • molecular electrochemistry
  • polyoxometalates
  • voltammetry
  • METAL-ORGANIC FRAMEWORKS
  • ELECTROCHEMICAL PROPERTIES
  • SUBSTITUTED POLYOXOTUNGSTATES
  • HETEROGENEOUS CATALYSTS
  • MODIFIED ELECTRODES
  • CYCLIC VOLTAMMETRY
  • KEGGIN STRUCTURE
  • OXIDATION
  • REDUCTION
  • HETEROPOLYTUNGSTATES

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