Abstract
A hydrophobic polymer of intrinsic microporosity (PIM-EA-TB) is employed to stabilize an organogel/aqueous electrolyte phase boundary based on an organic water-insoluble 4-(3-phenylpropyl)-pyridine phase. The organogel with electrocatalytic metal complexes embedded is immobilized on glassy carbon or on transparent mesoporous tin-doped indium oxide (ITO) electrodes. Liquid/liquid ion transfer voltammetry is investigated for a 4-(3-phenylpropyl)-pyridine organogel/aqueous electrolyte interface for two types of redox systems: tetraphenylporphyrinato-Mn(III/II) (MnTPP) and phthalocyanato-Mn(III/II) (MnPc). Electron transfer is shown to be coupled to reversible liquid/liquid anion transfer processes for PF 6 −, ClO 4 −, SCN −, and NO 3 −, with a change in mechanism for the more hydrophilic anions Cl −, F −, and SO 4 2−. In situ UV-Vis spectroelectrochemistry reveals reversible Mn(III/II) redox processes coupled to ion transfer for MnTPP. But further complexity and a detrimental side reaction are observed for MnPc causing gradual loss of the electrochemical response in the presence of dioxygen. [Figure not available: see fulltext.].
Original language | English |
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Pages (from-to) | 295-304 |
Number of pages | 10 |
Journal | Electrocatalysis |
Volume | 10 |
Issue number | 4 |
DOIs | |
Publication status | Published - 15 Jul 2019 |
Keywords
- Anion transfer
- Catalysis
- Electrochromic
- Microporosity
- Sensor
- Voltammetry
ASJC Scopus subject areas
- Electrochemistry