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

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...

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Bibliographic Details
Main Author: Fernandes, Diana M. (author)
Other Authors: Granadeiro, Carlos M. (author), Paes de Sousa, Patricia M. (author), Grazina, Raquel (author), Moura, Jose J. G. (author), Silva, Patricia (author), Almeida Paz, Filipe A. (author), Cunha-Silva, Luis (author), Balula, Salete S. (author), Freire, Cristina (author)
Format: article
Language:eng
Published: 1000
Subjects:
METAL-ORGANIC FRAMEWORKS
ELECTROCHEMICAL PROPERTIES
SUBSTITUTED POLYOXOTUNGSTATES
HETEROGENEOUS CATALYSTS
MODIFIED ELECTRODES
CYCLIC VOLTAMMETRY
KEGGIN STRUCTURE
OXIDATION
REDUCTION
HETEROPOLYTUNGSTATES
Online Access:http://hdl.handle.net/10773/20544
Country:Portugal
Oai:oai:ria.ua.pt:10773/20544
Description
Summary: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.

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