Nitrate and Nitrite Electrocatalytic Reduction at Layer-by-Layer Films Composed of Dawson-type Heteropolyanions Mono-substituted with Transitional Metal Ions and Silver Nanoparticles

Shahzad Imar, Mustansara Yaqub, Chiara Maccato, Calum Dickinson, Fathima Laffir, Mikhail Vagin, Timothy McCormac

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A series of Dawson-type heteropolyanions (HPAs) mono-substituted with transitional metal ions (α2-[P2W17O61FeIII]8-, α2-[P2W17O61CuII]8- and α2-[P2W17O61NiII]8-) have exhibited electrocatalytic properties towards nitrate and nitrite reduction in slightly acidic media (pH 4.5). The immobilization of these HPAs into water-processable films developed via layer-by layer assembly with polymer-stabilized silver nanoparticles led to the fabrication of the electrocatalytic interfaces for both nitrate and nitrite reduction. The LBL assembly as well as the changes in the HPA properties by immobilization has been characterized by electrochemical methods. The effects of the substituent ions, outer layers and the cationic moieties utilized for the films assembly of the developed film on the performances of nitrate electrocatalysis has been elucidated.

    Original languageEnglish
    Pages (from-to)323-330
    Number of pages8
    JournalElectrochimica Acta
    Volume184
    DOIs
    Publication statusPublished - 1 Dec 2015

    Keywords

    • electrocatalysis
    • layer-by-layer assembly
    • Mono-substituted heteropolyanions
    • nitrate reduction
    • silver nanoparticles

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