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The immobilisation and reactivity of Fe(CN)63−/4− in an intrinsically microporous polyamine (PIM-EA-TB).
- Source :
- Journal of Solid State Electrochemistry; Nov2020, Vol. 24 Issue 11/12, p2797-2806, 10p
- Publication Year :
- 2020
-
Abstract
- Protonation of the molecularly rigid polymer of intrinsic microporosity PIM-EA-TB can be coupled to immobilisation of Fe(CN)<subscript>6</subscript><superscript>3−/4−</superscript> (as well as immobilisation of Prussian blue) into 1–2 nm diameter channels. The resulting films provide redox-active coatings on glassy carbon electrodes. Uptake, transport, and retention of Fe(CN)<subscript>6</subscript><superscript>3−/4−</superscript> in the microporous polymer are strongly pH dependent requiring protonation of the PIM-EA-TB (pK<subscript>A</subscript> ≈ 4). Both Fe(CN)<subscript>6</subscript><superscript>4−</superscript> and Fe(CN)<subscript>6</subscript><superscript>3−</superscript> can be immobilised, but Fe(CN)<subscript>6</subscript><superscript>4−</superscript> appears to bind tighter to the polymer backbone presumably via bridging protons. Loss of Fe(CN)<subscript>6</subscript><superscript>3−/4−</superscript> by leaching into the aqueous solution phase becomes significant only at pH > 9 and is likely to be associated with hydroxide anions directly entering the microporous structure to combine with protons. This and the interaction of Fe(CN)<subscript>6</subscript><superscript>3−/4−</superscript> and protons within the molecularly rigid PIM-EA-TB host are suggested to be responsible for retention and relatively slow leaching processes. Electrocatalysis with immobilised Fe(CN)<subscript>6</subscript><superscript>3−/4−</superscript> is demonstrated for the oxidation of ascorbic acid. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14328488
- Volume :
- 24
- Issue :
- 11/12
- Database :
- Complementary Index
- Journal :
- Journal of Solid State Electrochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 146479668
- Full Text :
- https://doi.org/10.1007/s10008-020-04603-4