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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsResearchers have demonstrated promising seawater electrolysis results in the lab, including long-duration operation at high current density. But those results do not show that direct seawater splitting is already a commercially proven way to produce renewable hydrogen at scale. Seawater’s chloride, other dissolved ions and minerals create operating problems that researchers are still working to control.
What direct seawater splitting does—and what it avoids
Electrolysis uses electricity to split water into hydrogen and oxygen. In direct seawater electrolysis, seawater is the electrolyser’s feed, without conventional desalination or enhanced pretreatment. The alternative is to desalinate and purify seawater first, then use established electrolysis technologies with that treated water. These are different engineering routes, not interchangeable descriptions of the same process.
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Direct splitting can avoid a desalination and purification step, but it does not make the dissolved salts disappear: the electrolyser must cope with them. A technical review published in 2025 describes desalination followed by electrolysis as a more controlled operating route, while direct seawater splitting must address the effects of seawater’s complex composition. Avoiding pretreatment alone does not establish that the direct route uses less energy overall or produces cheaper hydrogen.
Why seawater is difficult to electrolyse
Chloride reactions at the anode
At the anode, the desired reaction releases oxygen. Chloride ions can compete with oxygen evolution and produce chlorine or other chlorine-containing products. Those competing reactions can affect efficiency and product quality, and create corrosion and safety concerns. Fan and colleagues describe chlorine evolution, electrode corrosion and other side reactions as major challenges for direct seawater splitting in their 2024 Nature Sustainability paper (paper).
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Mineral deposits at the cathode
At the cathode, water reduction raises the local pH. That can cause magnesium and calcium hydroxides to precipitate on or near the electrode, fouling active sites and interfering with operation. Seawater’s mixed-ion environment can also contribute to corrosion and unwanted side reactions, shortening catalyst life or reducing performance. A 2023 review by Xu, Li, Zhang, Shen, Zheng and Xi discusses these issues in its overview of direct seawater splitting (review).
Researchers are testing several design strategies
There is no single settled design that removes every obstacle. Work spans catalysts and protective surface layers, membranes and electrolytes, and the way the electrolyser is assembled. For example, Fan and colleagues reported a layered double hydroxide catalyst with carbonate ions in its interlayers and graphene quantum dots on its surface, designed to reduce chloride adsorption and improve resistance to chloride corrosion. That is a specific research approach, not evidence that chloride effects have been solved for all systems.
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A separate 2024 Nature Communications study on a molybdenum nitride (Mo2N)-driven electrolyser proposed that in-situ ammonium formation could constrain local hydroxide and reduce magnesium hydroxide precipitation in the tested system (study). This reported mechanism should not be treated as a universal solution to mineral fouling.
What the reported performance figures show
Fan and colleagues’ 2024 paper reports two distinct results. They reported more than 2,800 hours of stable electrolysis at approximately 1.25 A cm−2 for their catalyst test. Separately, their photovoltaic-electrolysis device achieved a reported solar-to-hydrogen efficiency of 18.1% and 200 hours of stability at a working current above 440 mA. The figures describe the study’s particular catalyst test and device configuration; they are not interchangeable measures of a commercial plant’s output, lifetime or economics.
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These results matter because high-current operation and durability are important engineering challenges. But a laboratory demonstration—even one with extended operation—does not by itself establish commercial availability, performance across different seawater conditions, or project-level cost. A 2024 Nature Communications paper also reports a hydrogen production rate and a study-calculated hydrogen cost for its Mo2N system. That calculation depends on the study’s assumptions and apparatus; it is not a verified market price or bankable project-cost estimate.
Direct seawater splitting versus desalination first
| Consideration | Direct seawater splitting | Desalination, then electrolysis |
|---|---|---|
| Feed preparation | Uses seawater without conventional desalination or enhanced pretreatment, depending on the system design. | Adds desalination and purification to provide treated water. |
| Electrolyser environment | Chloride and other ions expose the system to competing reactions, corrosion and mineral deposits. | High-purity feed supports more stable operation with established electrolysis technologies, according to the 2025 technical review. |
| Maturity in the cited review | Primarily laboratory research and demonstration. | Uses established electrolysis technologies with an added treatment step. |
| Key scale-up question | Can durable performance be maintained under realistic, sustained operation while controlling seawater-related side effects? | How do treatment energy, water-treatment equipment, integration and project economics affect the overall system? |
The comparison is not simply “extra desalination energy” versus “no desalination energy.” Direct systems still have to manage seawater-derived side effects, while the indirect route adds treatment equipment and its operating requirements. The cited sources do not establish a comparable project-level cost or lifecycle assessment that would show which route is cheaper or lower-impact in a specific location.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Has seawater electrolysis reached commercial scale?
A 2025 technical review on seawater as a feedstock for green hydrogen reports that most direct-seawater-splitting research remained at laboratory scale and that it found no operating commercial renewable-hydrogen projects based on direct seawater splitting. The review also identifies a Chinese demonstration project launched in 2023. These are the review’s findings and status descriptions, not a guarantee that project status has stayed unchanged since publication (2025 technical review).
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →For scale-up, the central test is whether a complete system can sustain useful operation with realistic seawater over time—not just whether a catalyst can perform well under a reported laboratory configuration. Durability, control of chlorine-related reactions and mineral fouling, treatment or maintenance needs, and integration with electricity supply all matter. The reported laboratory figures are encouraging evidence of research progress, but they do not answer those project-scale questions.
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