Surface immobilization of a tetra-ruthenium substituted polyoxometalate water oxidation catalyst through the employment of conducting polypyrrole and the layer-by-layer (LBL) technique

Nargis Anwar, Andrea Sartorel, Mustansara Yaqub, Kevin Wearen, Fathima Laffir, Gordon Armstrong, Calum Dickinson, Marcella Bonchio, Timothy McCormac

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A tetra Ru-substituted polyoxometalate Na10[{Ru 4O4(OH)2(H2O)4}(γ- SiW10O36)2] (Ru4POM) has been successfully immobilised onto glassy carbon electrodes and indium tin oxide (ITO) coated glass slides through the employment of a conducting polypyrrole matrix and the layer-by-layer (LBL) technique. The resulting Ru4POM doped polypyrrole films showed stable redox behavior associated with the Ru centres within the Ru4POM, whereas, the POM's tungsten-oxo redox centres were not accessible. The films showed pH dependent redox behavior within the pH range 2-5 whilst exhibiting excellent stability towards redox cycling. The layer-by-layer assembly was constructed onto poly(diallyldimethylammonium chloride) (PDDA) modified carbon electrodes by alternate depositions of Ru 4POM and a Ru(II) metallodendrimer. The resulting Ru4POM assemblies showed stable redox behavior for the redox processes associated with Ru4POM in the pH range 2-5. The charge transfer resistance of the LBL films was calculated through AC-Impedance. Surface characterization of both the polymer and LBL Ru4POM films was carried out using atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Initial investigations into the ability of the Ru 4POM LBL films to electrocatalytically oxidise water at pH 7 have also been conducted.

    Original languageEnglish
    Pages (from-to)8022-8031
    Number of pages10
    JournalACS Applied Materials and Interfaces
    Volume6
    Issue number11
    DOIs
    Publication statusPublished - 11 Jun 2014

    Keywords

    • conducting polymer
    • electrocatalysis
    • immobilization
    • multilayer assembly
    • polyoxometalates
    • water oxidation

    Fingerprint

    Dive into the research topics of 'Surface immobilization of a tetra-ruthenium substituted polyoxometalate water oxidation catalyst through the employment of conducting polypyrrole and the layer-by-layer (LBL) technique'. Together they form a unique fingerprint.

    Cite this