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New Material Developed by Swedish Scientists Increases Hydrogen Production Eightfold With Solar Light and Could Revolutionize Heavy Transportation.
Researchers at Linköping University in Sweden have created a new material capable of multiplying the efficiency of hydrogen production from solar light by eight.
The discovery could have a direct impact on heavy transportation, such as trucks, ships, and airplanes, which today cannot rely solely on batteries to operate.
Battery Works Well, But Only for Light Cars
While electric cars gain ground, larger vehicles continue to depend on fossil fuels. This is due to technical limitations of batteries, such as low energy density and difficulty of fast recharging.
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According to Jianwu Sun, a professor at Linköping University, “passenger cars can have batteries, but heavy trucks, ships, or aircraft cannot use batteries to store energy.”
Therefore, the focus is on hydrogen as an alternative. If produced cleanly, it could fuel these sectors and help reduce carbon emissions in the transportation of goods and people over long distances.
Three Layers, A Performance Leap
Sun’s team developed a three-layer structured material that uses only solar light to split water into hydrogen and oxygen. The base is made of cubic silicon carbide (3C-SiC), over which two other layers are applied: cobalt oxide (Co₃O₄) and nickel hydroxide (Ni(OH)₂).
The combination allows for a more efficient separation of the electric charges generated by solar light, preventing them from canceling each other out before producing the desired reaction. This results in hydrogen production eight times greater than the isolated 3C-SiC.
According to Sun himself, the team’s focus was to understand how each of these layers contributes to performance. “It’s a very complex structure, so our focus in this study was to understand the function of each layer and how it helps improve the material’s properties.”
The Difference Between Gray and Green Hydrogen
Currently, so-called “gray” hydrogen dominates the market. It is produced from fossil fuels and generates up to 10 tons of CO₂ per ton of hydrogen. In contrast, “green” hydrogen is produced by splitting water using renewable electricity. Even so, it still relies on external energy sources beyond direct solar light.
The Swedish group’s proposal is to make the process even cleaner, using solely solar energy to generate hydrogen. This would reduce both costs and emissions, moving toward a truly sustainable fuel.
The Challenge of Efficiency
Even with good results, the technology is still far from being commercially viable. Currently, most similar materials achieve only between 1% and 3% efficiency in solar water splitting. For green hydrogen to become viable on a large scale, it is necessary to reach at least 10%.
Sun believes this is possible but will take time. “It may take five to 10 years for the research team to develop materials that reach the coveted 10% limit,” he states.
A Possible Future for Transportation
If the 10% efficiency is achieved, solar hydrogen production could be done on a large scale and at reduced cost. This advancement would allow fueling trucks, ships, and airplanes without depending on fossil fuels.
The findings were published in the Journal of the American Chemical Society.
