Mid infrared imaging of mass transport in polymer electrolyte membranes of an operating microfluidic water electrolyzer

TL;DR

This paper uses infrared spectroscopic imaging to study water transport in PEM electrolyzers, revealing how anolyte concentration affects water diffusion and electrochemical stability, emphasizing the importance of water management for efficient operation.

Contribution

It introduces operando infrared imaging to visualize water transport in PEM electrolyzers and analyzes the impact of anolyte concentration on membrane hydration and performance.

Findings

Higher anolyte concentrations increase current density variability.

Infrared imaging reveals localized water diffusion gradients.

Water management is critical for stable PEM electrolyzer operation.

Abstract

This study investigates water transport in a polymer electrolyte membrane (PEM) electrolyzer using operando infrared spectroscopic imaging. By testing different H2SO4 anolyte concentrations, it examines electrochemical performance, water diffusion, and membrane hydration. Higher anolyte concentrations increased standard deviations in current densities and led to water diffusion gradients revealed by infrared imaging and confirming localized water transport variations. The study highlights the need for improved water management and optimized electrolyzer design for stable and efficient PEM electrolysis in industrial applications.