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Analysis of Ionic Domain Evolution on a Nafion-Sulfonated Silica Composite Membrane Using a Numerical Approximation

Osung Kwon¹, JaeHyoung Park²

¹Faculty of Science, Tabula Rasa College, Keimyung University in Seongseo, Daegu 42601, Korea.

|September 23, 2022

Summary

This study quantitatively analyzed proton conductivity in Nafion-sulfonated silica composite membranes. Results show enhanced ionic channel density and distribution, indicating improved proton transport mechanisms for proton exchange membranes (PEMs).

Keywords:

electrostatic force microscopy ionic channel distribution numerical approximation model proton conductivity proton exchange membrane proton transport mechanism

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Area of Science:

Materials Science
Electrochemistry
Polymer Science

Background:

Proton exchange membranes (PEMs) are crucial for electrochemical devices, requiring efficient proton transport.
Characterizing ionic structures and transport mechanisms is key to optimizing PEM performance.
Nafion-based composite membranes offer potential for enhanced proton conductivity.

Purpose of the Study:

To quantitatively analyze proton conductivity enhancement in Nafion-sulfonated silica (SSA) composite membranes.
To investigate the impact of ionic channel distribution on proton transport.
To evaluate the suitability of numerical approximation models for PEM characterization.

Main Methods:

Electrostatic Force Microscopy (EFM) was employed to measure membrane morphology and surface charge distribution.
A numerical approximation model (NAM) was utilized for quantitative analysis of surface charges and ionic channel density.
Comparative analysis was performed between pristine Nafion and Nafion-SSA composite membranes.

Main Results:

Nafion-SSA composites exhibited a twofold increase in mean local ionic channel density compared to pristine Nafion.
The local ionic channel density distribution in Nafion-SSA was 23.5 times greater than in pristine Nafion.
Numerical approximation modeling identified local agglomerations in Nafion-SSA, present in approximately 10% of the scanned area.

Conclusions:

The study successfully characterized variations in ionic channel distribution within Nafion-SSA composite membranes.
Findings highlight significant enhancements in ionic channel density and distribution, correlating with improved proton conductivity.
The numerical approximation model (NAM) is validated as a suitable tool for quantitative assessment of proton exchange membranes (PEMs).