Interfacing a heteropolytungstate complex and gelatin through a coacervation process: design of bionanocomposite films as novel electrocatalysts.

Basma Khadro (1) , Imane Baroudi (1) , Anne-Marie Goncalves (1) , Bruno Berini (2) , Bruce Pegot (1) , Farid Nouar (1) , Thi Ngoc Ha Le (1) , François Ribot (3) , Christel Gervais (3) , Florent Carn (4) , Emmanuel Cadot (1) , Christine Mousty (5) , Corine Simonnet-Jégat (1) , Nathalie Steunou (1)

1 ILV - Institut Lavoisier de Versailles
2 GEMAC - Groupe d'Etude de la Matière Condensée
3 LCMCP (site Paris VI) - Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI)
4 MSC - Matière et Systèmes Complexes
5 ICCF - Institut de Chimie de Clermont-Ferrand

Bionanocomposite films on glassy carbon electrodes (GCEs) have been prepared by a very straightforward and reliable method based on a layer-by-layer deposition of polyoxometalate (POM) (i.e. [BW12O40]5−) and gelatin solutions. The strong immobilisation of [BW12O40]5− on the surface of the GCE results from electrostatic interactions between gelatin and POM, as evidenced in a hybrid hydrogel prepared by a coacervation process. The GCE has also been modified by imidazolium based ionic liquids in order to increase the charge transfer rate. Two modified electrodes with one or two POM layers have been prepared by this strategy. When compared to other POM-based modified electrodes, the novel electrodes with two POM layers exhibit excellent electrocatalytic performance for nitrite detection at pH 3 in terms of sensitivity (868 mA M−1 cm−2) and linear range of nitrite concentrations (50-600 μM).

Basma Khadro, Imane Baroudi, Anne-Marie Goncalves, Bruno Berini, Bruce Pegot, et al.. Interfacing a heteropolytungstate complex and gelatin through a coacervation process: design of bionanocomposite films as novel electrocatalysts.. Journal of Materials Chemistry A, 2014, 2 (9208-9220), pp.9208-9220. ⟨10.1039/c4ta01142b⟩. ⟨hal-01002760⟩