Development and characterisation of the advanced alkaline water electrolysis stack based on zero gap approach.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43918495" target="_blank" >RIV/60461373:22310/19:43918495 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Development and characterisation of the advanced alkaline water electrolysis stack based on zero gap approach.

Original language description

Water electrolysis stands in the centre of the hydrogen economy scheme developed to ensure effective utilisation of the renewable energy sources. Nowadays, there main routes of the water electrolysis technology on different stages of maturity are reported. As a most mature out of them alkaline process is considered. It is because alkaline water electrolysis is operated on an industrial scale for more than a century, including high capacity units. In contrast to the alternative PEM and solid oxides technologies it, however, does operate with liquid electrolyte on base of the concentrated KOH solution. Utilisation of this liquid electrolyte has several consequences. The first one consists in an increased ohmic resistance of the cell, sensitivity to the pressure gradient between the electrodes compartments and sensitivity to the decreasing temperature resulting in reduced flexibility of the cell operation. These factors were not of a significant importance for the traditional utilization for a steady production of hydrogen as a raw material for follow up processes. But they become crucial in the case of compensation of fluctuating unused capacity of the renewable energy power sources. This contribution reports on development of an advanced electrolysis cell reducing impact of the mentioned factors. It represents continuation of ongoing long-term research of our laboratory in the field of development of well performing and stable alkaline polymer electrolyte. Utilizing of the polymer electrolyte membrane based on such materials allows to modify significantly construction of the water electrolysis stack and to use “zero gap” approach. It is based on the system configuration, in which the electrodes are pressed directly on the surface of the membrane. On this way intra electrode distance is reduced and accumulation of the gasses produced between the electrodes eliminated. At the same time, construction of the electrolysis cell becomes significantly more compact. Due to the reduced volume and concentration of the KOH electrolyte, also flexibility of the system is improved significantly.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/FV10529" target="_blank" >FV10529: Advanced process for electrolytic hydrogen production from renewable sources</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů