Ion-solvating membranes as a new approach towards high rate alkaline electrolyzers

Kraglund, Mikkel Rykær; Carmo, Marcelo; Schiller, Günter; Ansar, Syed Asif; Aili, David; Christensen, Erik R.; Jensen, Jens Oluf

doi:10.1039/c9ee00832b

Cited by 163 publications

(143 citation statements)

References 53 publications

Supporting

Mentioning

137

Contrasting

Unclassified

Order By: Relevance

“…Overall, the best performance was found for the Ni-Fe-O x anode and Ni-Fe-Co cathode with the PBI membrane from sustaining ions, and 1 M KOH was used as the feedstock at 1000 mA cm À2 and 1.9 V at 60 C. This is a signicant achievement compared to results currently available in the literature. However, our electrolyser performance was slightly lower than that reported by M. R. Kraglund et al The performance reported by M. R. Kraglund et al 40 was higher; however, they used an ion solvating membrane that has not yet been conrmed to be stable. Long-term stability is a fundamental requirement of an electrolyser.…”

Section: Aem Electrolysiscontrasting

confidence: 78%

Highly cost-effective platinum-free anion exchange membrane electrolysis for large scale energy storage and hydrogen production

2020

View full text Add to dashboard Cite

show abstract

Section: Aem Electrolysiscontrasting

confidence: 78%

Highly cost-effective platinum-free anion exchange membrane electrolysis for large scale energy storage and hydrogen production

2020

View full text Add to dashboard Cite

show abstract

“…Diaphragms like AGFA's Zirfon [2] or ion-solvating membranes (e.g., polybenzimidazole) [66] can only be used in alkaline water electrolyzers and are therefore not considered here.…”

Section: Commercially Available State-of-the Art Membranesmentioning

confidence: 99%

Overview: State-of-the Art Commercial Membranes for Anion Exchange Membrane Water Electrolysis

Henkensmeier

Najibah

Harms³

et al. 2020

Journal of Electrochemical Energy Conversion and Storage

197

205

View full text Add to dashboard Cite

One promising way to store and distribute large amounts of renewable energy is water electrolysis, coupled with transport of hydrogen in the gas grid and storage in tanks and caverns. The intermittent availability of renewal energy makes it difficult to integrate it with established alkaline water electrolysis technology. Proton exchange membrane (PEM) water electrolysis is promising, but limited by the necessity to use expensive platinum and iridium catalysts. The expected solution is anion exchange membrane (AEM) water electrolysis, which combines the use of cheap and abundant catalyst materials with the advantages of PEM water electrolysis, namely a low foot print, large operational capacity, and fast response to changing operating conditions. The key component for AEM water electrolysis is a cheap, stable, gas tight and highly hydroxide conductive polymeric AEM. Here we present target values and technical requirements for AEMs, discuss the chemical structures involved and the related degradation pathways, and give an overview over the most prominent and promising commercial AEMs (Fumatech Fumasep® FAA3, Tokuyama A201, Ionomr Aemion™, Dioxide materials Sustainion®, and membranes commercialized by Orion Polymer), and review their properties and performances of water electrolyzers using these membranes.

show abstract

“…Later, this concept was replaced by the zero-gap assembly, where the electrodes are directly pressed onto the separator to minimize ohmic losses due to the electrolyte. Porous materials like Zirfon ™ Perl UTP 500 (AGFA) or dense anion exchange membranes can be used as the separator [33][34][35][36][37]. Figure 3.…”

Section: Cell Design and Cell Voltagementioning

confidence: 99%

Alkaline Water Electrolysis Powered by Renewable Energy: A Review

2020

View full text Add to dashboard Cite

Alkaline water electrolysis is a key technology for large-scale hydrogen production powered by renewable energy. As conventional electrolyzers are designed for operation at fixed process conditions, the implementation of fluctuating and highly intermittent renewable energy is challenging. This contribution shows the recent state of system descriptions for alkaline water electrolysis and renewable energies, such as solar and wind power. Each component of a hydrogen energy system needs to be optimized to increase the operation time and system efficiency. Only in this way can hydrogen produced by electrolysis processes be competitive with the conventional path based on fossil energy sources. Conventional alkaline water electrolyzers show a limited part-load range due to an increased gas impurity at low power availability. As explosive mixtures of hydrogen and oxygen must be prevented, a safety shutdown is performed when reaching specific gas contamination. Furthermore, the cell voltage should be optimized to maintain a high efficiency. While photovoltaic panels can be directly coupled to alkaline water electrolyzers, wind turbines require suitable converters with additional losses. By combining alkaline water electrolysis with hydrogen storage tanks and fuel cells, power grid stabilization can be performed. As a consequence, the conventional spinning reserve can be reduced, which additionally lowers the carbon dioxide emissions.

show abstract

Ion-solvating membranes as a new approach towards high rate alkaline electrolyzers

Abstract: Polymer membranes imbibed with KOH represent a novel way to achieve ionic conductivity and show promise for alkaline electrolyzers.

Cited by 163 publications

References 53 publications

Highly cost-effective platinum-free anion exchange membrane electrolysis for large scale energy storage and hydrogen production

Highly cost-effective platinum-free anion exchange membrane electrolysis for large scale energy storage and hydrogen production

Overview: State-of-the Art Commercial Membranes for Anion Exchange Membrane Water Electrolysis

Alkaline Water Electrolysis Powered by Renewable Energy: A Review

Contact Info

Product

Resources

About