Potassium cation induced ionic diode blocking for a polymer of intrinsic microporosity | nafion “heterojunction” on a microhole substrate

Budi Riza Putra; Mariolino Carta; Richard Malpass-Evans; Neil B. McKeown; Frank Marken

doi:10.1016/j.electacta.2017.11.130

Potassium cation induced ionic diode blocking for a polymer of intrinsic microporosity | nafion “heterojunction” on a microhole substrate

Budi Riza Putra
, Mariolino Carta
, Richard Malpass-Evans
, Neil B. McKeown
, Frank Marken

Bogor Agricultural University
Edinburgh Napier University

Research output: Contribution to journal › Article › peer-review

29 Citations (SciVal)

Abstract

“Heterojunction” ionic diodes based on a Nafion cation conductor and a polymer of intrinsic microporosity (PIM) interfaced at a 6 μm thickness polyethylene-terephthalate (PET) film with 20 μm diameter microhole exhibit rectification effects in cation (K⁺) flux. When combined with the precipitation reaction of potassium cations with perchlorate anions to give insoluble KClO₄ (solubility product ca. 1.05 × 10⁻² M² at 25 °C) at the PIM | Nafion interface, inversion of the rectification/diode effect occurs and the formerly “open” state changes into a “closed” state due to blocking of ion flow. The localised interfacial precipitation reaction is due to up to three orders of magnitude accumulation of K⁺ at the PIM | Nafion interface and shown to be fast and reversible. The effects of K⁺/ClO₄ ⁻ concentration and of Na⁺ interference are considered. The blocking process within the heterojunction ionic diode is suggested to be dynamic/fast and potentially useful as a diode sensor mechanism based on solubility product dependent precipitation.

Original language	English
Pages (from-to)	807-813
Number of pages	7
Journal	Electrochimica Acta
Volume	258
Early online date	22 Nov 2017
DOIs	https://doi.org/10.1016/j.electacta.2017.11.130
Publication status	Published - 20 Dec 2017

Funding

B.R.P. thanks to Indonesian Endowment (LPDsP RI) for a PhD scholarship. F.M and N.B.M. thanks the Leverhulme foundation for financial support ( RPG-2014-308 : “New Materials for Ionic Diodes and Ionic Photodiodes”).

Keywords

Membrane
Potassium
Precipitation
Sensor
Voltammetry

ASJC Scopus subject areas

General Chemical Engineering
Electrochemistry

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10.1016/j.electacta.2017.11.130

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title = "Potassium cation induced ionic diode blocking for a polymer of intrinsic microporosity | nafion {\textquotedblleft}heterojunction{\textquotedblright} on a microhole substrate",

abstract = "{\textquotedblleft}Heterojunction{\textquotedblright} ionic diodes based on a Nafion cation conductor and a polymer of intrinsic microporosity (PIM) interfaced at a 6 μm thickness polyethylene-terephthalate (PET) film with 20 μm diameter microhole exhibit rectification effects in cation (K+) flux. When combined with the precipitation reaction of potassium cations with perchlorate anions to give insoluble KClO4 (solubility product ca. 1.05 {\texttimes} 10−2 M2 at 25 °C) at the PIM | Nafion interface, inversion of the rectification/diode effect occurs and the formerly {\textquotedblleft}open{\textquotedblright} state changes into a {\textquotedblleft}closed{\textquotedblright} state due to blocking of ion flow. The localised interfacial precipitation reaction is due to up to three orders of magnitude accumulation of K+ at the PIM | Nafion interface and shown to be fast and reversible. The effects of K+/ClO4 − concentration and of Na+ interference are considered. The blocking process within the heterojunction ionic diode is suggested to be dynamic/fast and potentially useful as a diode sensor mechanism based on solubility product dependent precipitation.",

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AU - Riza Putra, Budi

AU - Carta, Mariolino

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AU - McKeown, Neil B.

AU - Marken, Frank

PY - 2017/12/20

Y1 - 2017/12/20

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Potassium cation induced ionic diode blocking for a polymer of intrinsic microporosity | nafion “heterojunction” on a microhole substrate

Abstract

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Keywords

ASJC Scopus subject areas

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