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New Clean Technology Combines Sustainable Solar Energy and Extracts Green Hydrogen and Drinking Water from the Sea, Driving Sustainable Development According to Research Led by Cornell and MIT.
A promising scientific advance could revolutionize the way the world views the generation of clean energy and access to drinking water. Researchers led by Cornell University, in collaboration with scientists from MIT, Johns Hopkins University, and Michigan State University, have developed an innovative technology capable of extracting green hydrogen and drinking water directly from seawater, using only solar energy.
The system, called HSD-WE (Solar Distillation-Electrolysis of Water), represents an unprecedented fusion of energy sustainability and water accessibility. With low cost, high efficiency, and the use of abundant resources, the solution was detailed in an article published in the prestigious journal Energy & Environmental Science.
Green Hydrogen and Drinking Water in One System
Green hydrogen is considered one of the most promising fuels in the race for a net-zero emissions energy matrix by 2050, especially due to its versatility and the fact that it does not generate pollutants during production and use. However, the traditional method of obtaining this gas — through electrolysis of deionized water — is expensive and energy-intensive, limiting its adoption on a large scale.
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That’s where the new technology stands out. Using seawater, an abundant and free resource, and natural solar energy, the device can simultaneously generate hydrogen and drinking water, with an energy efficiency of 12.6%. The prototype, which occupies only 10 cm², was able to produce about 200 milliliters of hydrogen per hour — a significant volume considering its small size.
How HSD-WE Works
The system harnesses almost 100% of the sunlight captured, including the heat that is usually wasted by conventional solar panels. This waste heat is used to warm a thin film of seawater, which comes into direct contact with the solar cell through capillary action — a physical phenomenon that allows the movement of liquids through narrow spaces without the need for pumping.
The process follows three main steps:
- Evaporation of seawater driven by the sun’s heat
- Condensation of vapor, which is collected as drinking water
- Electrolysis of the condensed water, which separates hydrogen and oxygen
The innovation addresses two major global challenges: the production of clean energy and the provision of safe water in regions where water scarcity is increasing. It is estimated that two-thirds of the global population currently faces some level of water supply insecurity.
Cost and Accessibility as Pillars of Innovation
Professor Lenan Zhang, from the Cornell University School of Mechanical and Aerospace Engineering, explained that the team’s goal was to break the cycle of dependence between energy and water. “We created this technology to provide a realistic and accessible solution, especially in places where infrastructure is limited or resources are scarce,” Zhang said.
One of the most promising differentiators of the technology is its cost-reducing potential. According to the team’s calculations, the cost of green hydrogen produced by the system could drop to US$ 1 per kilogram within 15 years — a figure considered strategic to make its widespread adoption feasible in sectors such as heavy industry, transportation, and power generation.
Possible Applications and Environmental Impact
The technology also paves the way for the development of multifunctional coastal solar parks, capable of generating clean energy, producing green hydrogen, and providing drinking water to nearby communities. Furthermore, the system can be used to cool solar panels with seawater, which extends their lifespan and improves overall efficiency.
The project, still in the prototype phase, was designed with a focus on structural simplicity, allowing future applications in arid regions, remote islands, and urban areas with poor infrastructure. “We want solutions with low carbon emissions, affordable costs, and broad reach. This is a promising technology with enormous potential for adoption,” Zhang stated.
What Is Green Hydrogen?
Green hydrogen is obtained through the electrolysis of water — a process in which the H₂O molecule is separated into hydrogen (H₂) and oxygen (O₂) using electric current. When this electrical energy comes from renewable sources, such as solar, wind, or hydro, the produced hydrogen is labeled as “green.”
Among its main advantages are:
- Zero greenhouse gas emissions
- High energy density
- Storage and transportation possibilities
- Industrial, vehicular, and power generation applications
With the popularization of technologies like HSD-WE, it is expected that green hydrogen will become a fundamental pillar of the global energy transition, especially in countries with abundant access to sun and seawater, like Brazil.
According to data from the United Nations (UN), over 2 billion people do not have access to safe drinking water, and about 770 million live without access to electricity. The new technology developed by Cornell and partners operates precisely at this critical intersection, providing a sustainable, scalable, and economically viable alternative for vulnerable communities and regions affected by the climate crisis.
By combining energy production and desalination in one system, the device can be adapted to various scenarios — from supporting humanitarian operations to applications in medium-sized industrial plants.
The technology developed by scientists from Cornell, MIT, and other universities has the potential to radically transform access to clean energy and drinking water. Utilizing seawater and solar energy, the HSD-WE system offers an accessible and efficient solution, capable of simultaneously producing green hydrogen and drinking water, with low cost and minimal environmental footprint.
With its continued development and large-scale adoption, this innovation could become one of the pillars of global sustainability in the coming decades, directly contributing to the fight against water scarcity, energy insecurity, and climate change.
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