SiW11Fe@ MIL-101(Cr) Composite: A Novel and Versatile Electrocatalyst
authors Fernandes, DM; Granadeiro, CM; de Sousa, PMP; Grazina, R; Moura, JJG; Silva, P; Paz, FAA; Cunha-Silva, L; Balula, SS; Freire, C
nationality International
journal CHEMELECTROCHEM
author keywords electrocatalysis; microporous materials; molecular electrochemistry; polyoxometalates; voltammetry
keywords METAL-ORGANIC FRAMEWORKS; ELECTROCHEMICAL PROPERTIES; SUBSTITUTED POLYOXOTUNGSTATES; HETEROGENEOUS CATALYSTS; MODIFIED ELECTRODES; CYCLIC VOLTAMMETRY; KEGGIN STRUCTURE; OXIDATION; REDUCTION; HETEROPOLYTUNGSTATES
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.
publisher WILEY-V C H VERLAG GMBH
issn 2196-0216
year published 2014
volume 1
issue 8
beginning page 1293
ending page 1300
digital object identifier (doi) 10.1002/celc.201402094
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000340523300006

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