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)O39]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 FeIII→FeII and the other two peaks to WVI→WV processes. The SiW11Fe@MIL‐101‐modified 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.