Abstract
Anion exchange membrane (AEM) electrolysis is a promising solution for large-scale hydrogen production from renewable energy resources. However, the performance of AEM electrolysis is still lower than what can be achieved with conventional technologies. The performance of AEM electrolysis is limited by integral components of the membrane electrode assembly and the reaction kinetics, which can be measured by ohmic and charge transfer resistances. We here investigate and then quantify the contributions of the ohmic and charge transfer resistances, and the rate-determining steps, involved in AEM electrolysis by using electrochemical impedance spectroscopy analysis. The factors that have an effect on the performance, such as voltage, flow rate, temperature and concentration, were studied at 1.5 and 1.9 V. Increased voltage, flow rate, temperature and concentration of the electrolyte strongly enhanced the anodic activity. We observed that here the anodic reaction offered a greater contribution to the overpotential than the cathode did.
Highlights
Anion exchange membrane (AEM) electrolysis is a promising solution for large-scale hydrogen production from renewable energy resources
The goal of our study was to investigate the various resistances involved in AEM electrolysis, both qualitative and quantitatively
We looked into determining the effect/s of factors that affect the performance of AEM electrolysis, such as the flow rate of the liquid electrolyte, the electrolyte concentration and temperature under various operating conditions
Summary
Anion exchange membrane (AEM) electrolysis is a promising solution for large-scale hydrogen production from renewable energy resources. The electricity produced directly from renewable sources, such as wind and solar, may be negatively impacted by fluctuations in relevant geographical factors, such as cloud cover and low winds[2] This leads to an interrupted supply of the renewable energy, renewable energy must be stored and used on demand for specific applications[2]. Low-temperature water electrolysis is one of the cutting edge technologies for the sustainable conversion of hydrogen from renewable energy, using water. This technology offers adequate energy storage and grid-balancing utility in power-to-gas o perations[4]. We do have alkaline electrolysis that is a mature and less expensive technology, but it cannot be linked with the renewable energies (solar, wind, etc.) for power generation owing to its inability to maintain high-pressure hydrogen, because of the required use of a porous diaphragm and liquid e lectrolyte[8]
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