Ionic Diode Current Rectification in High Salt Media with Sulfonated Poly(oxy-1,4-phenylene-oxy-1,4-phenylenecarbonyl-1,4-phenylene)

Chhavi  Sharma; Sara E. C. Dale; Klaus Mathwig; Marcel A. G.  Zevenbergen; Zhongkai Li; Bhuvanesh  E.; Kaushik  Parida; Yuvraj Singh  Negi; Frank Marken

doi:10.1002/celc.202400411

Ionic Diode Current Rectification in High Salt Media with Sulfonated Poly(oxy-1,4-phenylene-oxy-1,4-phenylenecarbonyl-1,4-phenylene)

Chhavi Sharma , Sara E. C. Dale, Klaus Mathwig, Marcel A. G. Zevenbergen , Zhongkai Li, Bhuvanesh E. , Kaushik Parida, Yuvraj Singh Negi , Frank Marken

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

Abstract

Sulfonated poly(oxy-1,4-phenylene-oxy-1,4-phenylenecarbonyl-1,4-phenylene) also known as SPEEK is a chemically robust cation conductor with good solution processability. A thin film (approx. 0.7 μm) coated asymmetrically over a 10 μm diameter microhole in a Teflon substrate film (5 μm thickness) produces ionic diode effects in aqueous electrolyte media even at high ionic strengths up to 2 M NaCl. The enhancement in the ionic diode performance under high salt conditions is tentatively attributed to a (partial) switch from a concentration polarisation effect (dominant for high diode currents) to interfacial polarisation (dominant at low current; proposed for molecularly rigid ionomers). Ionic strength effects on the diode performance seem relatively low further indicative of a mechanism for the diode effect caused by interfacial polarisation without significant concentration polarisation. Preliminary comparison of diode phenomena in aqueous HCl, LiCl, NaCl, and MgCl ₂ reveals cation specific effects due to interaction with the polymer.

Original language	English
Article number	e202400411
Journal	ChemElectroChem
Volume	11
Issue number	19
Early online date	5 Sept 2024
DOIs	https://doi.org/10.1002/celc.202400411
Publication status	Published - 1 Oct 2024

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Funding

F.M. thanks for the initial financial support by the EPSRC (EP/K004956/1). C.S. is thankful to the Commonwealth Scholarship Commission (CSC, split\u2010site fellowship, grant: INCN\u201022\u2010437) and the Ministry of Human Resources (MHRD), India, for financial assistance. We thank the University of Bath for support to perform this research work.

Funders	Funder number
Engineering and Physical Sciences Research Council	EP/K004956/1
Commonwealth Scholarship Commission	INCN‐22‐437

Keywords

Desalination
Ionic circuits
Ionic logic
Nanofluidic diode
Voltammetry

ASJC Scopus subject areas

Catalysis
Electrochemistry

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10.1002/celc.202400411Licence: CC BY

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title = "Ionic Diode Current Rectification in High Salt Media with Sulfonated Poly(oxy-1,4-phenylene-oxy-1,4-phenylenecarbonyl-1,4-phenylene)",

abstract = "Sulfonated poly(oxy-1,4-phenylene-oxy-1,4-phenylenecarbonyl-1,4-phenylene) also known as SPEEK is a chemically robust cation conductor with good solution processability. A thin film (approx. 0.7 μm) coated asymmetrically over a 10 μm diameter microhole in a Teflon substrate film (5 μm thickness) produces ionic diode effects in aqueous electrolyte media even at high ionic strengths up to 2 M NaCl. The enhancement in the ionic diode performance under high salt conditions is tentatively attributed to a (partial) switch from a concentration polarisation effect (dominant for high diode currents) to interfacial polarisation (dominant at low current; proposed for molecularly rigid ionomers). Ionic strength effects on the diode performance seem relatively low further indicative of a mechanism for the diode effect caused by interfacial polarisation without significant concentration polarisation. Preliminary comparison of diode phenomena in aqueous HCl, LiCl, NaCl, and MgCl 2 reveals cation specific effects due to interaction with the polymer.",

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author = "Chhavi Sharma and Dale, {Sara E. C.} and Klaus Mathwig and Zevenbergen, {Marcel A. G.} and Zhongkai Li and Bhuvanesh E. and Kaushik Parida and Negi, {Yuvraj Singh} and Frank Marken",

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AU - Sharma , Chhavi

AU - Dale, Sara E. C.

AU - Mathwig, Klaus

AU - Zevenbergen , Marcel A. G.

AU - Li, Zhongkai

AU - E. , Bhuvanesh

AU - Parida, Kaushik

AU - Negi , Yuvraj Singh

AU - Marken, Frank

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Ionic Diode Current Rectification in High Salt Media with Sulfonated Poly(oxy-1,4-phenylene-oxy-1,4-phenylenecarbonyl-1,4-phenylene)

Abstract

Data Availability Statement

Funding

Keywords

ASJC Scopus subject areas

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