Influence of aminosilane precursor concentration on physicochemical properties of composite Nafion membranes for vanadium redox flow battery applications

Mikhail S. Kondratenko, Evgeny A. Karpushkin, Nataliya A. Gvozdik, Marat O. Gallyamov, Keith J. Stevenson, Vladimir G. Sergeyev

    Research output: Contribution to journalArticlepeer-review

    30 Citations (Scopus)

    Abstract

    A series of composite proton-exchange membranes have been prepared via sol-gel modification of commercial Nafion membranes with [N-(2-aminoethyl)-3-aminopropyl]trimethoxysilane. The structure and physico-chemical properties (water uptake, ion-exchange capacity, vanadyl ion permeability, and proton conductivity) of the prepared composite membranes have been studied as a function of the precursor loading (degree of the membrane modification). If the amount of the precursor is below 0.4/1 M ratio of the amino groups of the precursor to the sulfonic groups of Nafion, the composite membranes exhibit decreased vanadium ion permeability while having relatively high proton conductivity. With respect to the use of a non-modified Nafion membrane, the performance of the composite membrane with an optimum precursor loading in a single-cell vanadium redox flow battery demonstrates enhanced energy efficiency in 20–80 mA cm−2 current density range. The maximum efficiency increase of 8% is observed at low current densities.

    Original languageEnglish
    Pages (from-to)32-39
    Number of pages8
    JournalJournal of Power Sources
    Volume340
    DOIs
    Publication statusPublished - 1 Feb 2017

    Keywords

    • Aminosilane
    • Composite membrane
    • Nafion
    • Redox flow battery
    • Vanadium

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