Making hydrogen directly from seawater is difficult because the electrolyser must split water while tolerating chloride, other dissolved ions, and changing surface conditions. At the anode, chloride can compete with the desired oxygen-producing reaction; across the cell, corrosion and mineral deposits can shorten operating life. Researchers are testing selective catalysts, protective materials, membranes, feedwater treatment, and new cell designs—but direct seawater electrolysis has not yet shown a clear general advantage over desalinating water first.
What “direct seawater electrolysis” means
Electrolysis uses electricity to split water, producing hydrogen at the cathode and oxygen at the anode. In direct seawater electrolysis (DSE), seawater is supplied to the electrolyser. In the indirect route, water is desalinated first and the resulting water is then electrolyzed. The distinction matters: findings from desalinated water, synthetic seawater, pretreated seawater, or an alkaline solution containing salt do not automatically demonstrate performance with untreated natural seawater.
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Seawater is a mixture of dissolved ions and impurities, not simply pure water with table salt added. Its composition and the cell’s operating conditions affect what happens at the electrodes and membranes. Reviews emphasize that results should identify the feedwater and assess the complete device, not just a catalyst in a laboratory test. The Journal of Power Sources review discusses the need to connect catalyst performance to membranes and reactor-level behavior.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsWhy the anode is a difficult trade-off
The intended anode reaction is oxygen evolution. But seawater contains chloride, which can undergo competing oxidation and form chlorine-related products. Researchers therefore need an anode that favors oxygen production while suppressing chloride reactions—and remains active and stable in chloride-rich conditions. A material that initially suppresses a side reaction is not necessarily useful if it corrodes, loses activity, or fails to maintain selectivity during sustained operation.
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That combination of selectivity and durability is central to the problem. The 2025 Nature Reviews Materials review identifies corrosion, chlorine-related side reactions, and metal precipitates as challenges linked to poor catalytic activity and limited lifetime. Reviews in ACS Materials Letters and the Journal of Power Sources examine approaches to avoiding chlorine evolution. This does not mean every seawater electrolyser releases chlorine: product formation depends on the chemistry and operating conditions, and suppressing competing chloride reactions is a research goal.
How corrosion and deposits can undermine operation
Corrosion and degradation
Chloride-rich conditions can accelerate corrosion and damage electrodes or other cell components. Protective layers and corrosion-resistant materials may help, but protection must work without blocking the desired reaction or preventing efficient transport through the cell. The practical question is not only whether a catalyst works at first, but whether the whole device keeps working under the stated feed and operating conditions.
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Precipitation and fouling
Electrode reactions create local conditions that can encourage dissolved species to form deposits. Magnesium- and calcium-containing hydroxides are among the concerns discussed in the literature. Deposits can cover active surfaces and interfere with sustained operation. The 2024 durability review describes approaches intended to limit hydroxide precipitation or adhesion, including strategies aimed at interactions involving hydroxide ions, magnesium, and calcium. It also discusses combining electrolysis with the production of nanoscale magnesium hydroxides; that is a proposed process direction, not proof that mineral fouling has been solved. The review’s PubMed record summarizes the durability topic.
What researchers are trying
Selective and protective anode surfaces
One research direction is to tune catalyst surfaces to favor oxygen evolution, reduce chloride oxidation, or limit chloride access to reactive sites. Protective, passivating, chloride-blocking, and selectively adsorbing layers are among the approaches considered in reviews. These strategies involve trade-offs: a surface layer must suppress unwanted chemistry without unduly reducing oxygen-evolution activity or becoming unstable in operation. A catalyst label alone does not establish selectivity; the measurement, electrolyte, and operating conditions matter.
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Corrosion-resistant materials and interfaces
Materials selection, protective coatings, and interfacial design aim to slow degradation. Durability claims are meaningful only when readers can see the test duration, load or current conditions, electrolyte composition, and whether the result came from a complete cell or an isolated material test. A short laboratory trial cannot by itself establish practical service life. The 2024 durability review considers the path from catalysts to systems, while the 2025 Nature Reviews Materials review addresses the linked activity and lifetime challenges.
Membranes and ion management
Membranes and ion-selective designs can help control which species reach particular parts of a cell or manage the ionic environment around the electrodes. They introduce their own engineering challenges, including fouling, degradation, and compatibility with the rest of the electrolyser. Their value must therefore be judged in the complete device rather than assumed from an isolated separation function.
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Feedwater treatment and desalination-first operation
Pretreatment can remove some impurities; desalination goes further by separating salts before electrolysis. This indirect approach avoids some direct-contact challenges, but it also adds water-treatment equipment and operating requirements. A fair comparison must consider the whole system: treatment energy and infrastructure on one side, and any resulting changes in electrolyser performance, reliability, or suitability for a particular site on the other.
Reactor and electrolyser design
Cell geometry and reactor architecture can be designed to coordinate fluid transport, electrode protection, membrane function, and product separation. Such designs are promising lines of investigation, not universal fixes. A device-level claim should be evaluated under a clearly specified feed and realistic operation; a catalyst result in a half-cell cannot answer every question about a working electrolyser.
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How to judge claims about a seawater electrolyser
When comparing a direct seawater system with desalination-first electrolysis, look for evidence across the whole process rather than a single headline result:
- Chloride chemistry: Does the study measure oxygen selectivity and chlorine-related products under the stated conditions?
- Durability: How long did the test run, at what load, and did it use a complete cell?
- Scaling and fouling: Does it explain how magnesium- and calcium-containing deposits are managed?
- Feedwater: Is the test based on natural seawater, synthetic seawater, pretreated water, or another electrolyte?
- Device integration: Are membrane, reactor, and product-separation performance reported alongside catalyst behavior?
- System comparison: Are water-treatment requirements compared with electrolyser performance, reliability, and operating needs?
These distinctions prevent results from one carefully controlled material test from being mistaken for proof of an economical, durable seawater-to-hydrogen system.
Does direct seawater electrolysis already save money?
That has not been established as a general advantage. In its record dated 20 January 2025, the European Commission Joint Research Centre stated: “There is currently no research or industrial project demonstrating clear benefits of using direct seawater electrolysis over indirect seawater electrolysis.” The assessment also allows that DSE could become viable for specific target applications. Read the JRC review record.
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This is a dated assessment, not a forecast about every later project or a claim that no direct-seawater design could work. It does mean that using seawater at the electrolyser cannot, by itself, be treated as evidence of lower cost or greater sustainability. The comparison depends on water treatment, cell performance, durability, and site-specific operating needs.
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