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Dissolved iron speeds electrolyzer degradation during power outages, study finds

A study shows that dissolved iron in water accelerates degradation of electrolyzers when the power supply stops, such as during outages.

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Dissolved iron speeds electrolyzer degradation during power outages, study finds
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A study has shown that dissolved iron impurities in water accelerate the degradation of electrolyzers used to produce green hydrogen from water split by electricity generated from renewable energy when the power supply is interrupted, such as during an outage.

An electrolyzer is a device that passes an electric current through water to separate it into hydrogen and oxygen. Its core is a stack of electrodes and membranes, and the condition of this part determines the performance and lifespan of the entire unit. Because output from solar and wind power fluctuates, electrolyzers tend to be repeatedly shut down and restarted as electricity supply rises and falls.

Water supplied to electrolyzers contains trace amounts of metal ions and impurities. While water treatment is generally used to remove them, it has long been pointed out that iron ions may leach from metal components in piping and equipment, and that when they adhere to the surfaces of electrodes and catalysts, reactivity declines.

Electrolyzers are among the most expensive equipment in hydrogen production facilities. A shorter lifespan raises replacement costs and feeds directly into the production cost of hydrogen. The durability of electrolyzers is a key factor in the commercial viability of green hydrogen.

Possible countermeasures include tighter water quality control to keep metal ions such as iron low, and a review of procedures for safely shutting down equipment during power outages. Design measures, including the selection of materials, should also be considered.

The focus going forward will be whether these degradation factors can be evaluated in relation to actual operating conditions and reflected in water quality standards and operating guidelines for shutdowns and restarts. Progress in verification using actual equipment will be a key indicator in judging improvements to electrolyzer durability.

Source: Bioengineer.org
This article was written by the editors based on the cited report and translated from Japanese. AI is used to assist in writing and translation.

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