Japan develops high-efficiency water molecule decomposition method using sunlight to decompose water molecules to produce hydrogen

According to foreign media reports, a research team affiliated with multiple Japanese institutions has developed a better method that uses sunlight to split water molecules to produce hydrogen. The group outlined the technology developed and the effect of the technology in the paper they published.

(Source: Nature Magazine)

As greenhouse gas emissions continue and the planet continues to warm, scientists are looking for alternatives to automobile gasoline, because gasoline combustion is also the main cause of global warming. One of the main research areas is to use hydrogen to replace gasoline in automobiles, because hydrogen does not produce any greenhouse gases when it is burned, but the progress of this research has been hindered by efficiency and cost issues. However, in this new study, the researchers re-examined the use of strontium titanate. Strontium titanate is an oxide composed of strontium and titanium. Since the late 1970s, scientists have known that strontium titanate can be used to decompose water molecules by photocatalysis, but it has not been able to find a cost-effective way to use it. Now, researchers in Japan have found a way to solve some of the obstacles they encountered in general use.

The researchers adopted several new technologies to better use strontium titanate as a photocatalyst. The first method is to suppress the charge recombination by increasing the crystallinity of the crystal and reducing the number of chemical defects in the crystal lattice; the second method is to further suppress the charge recombination by selectively depositing a promoter on the crystal surface; the third The protective tube sleeve made of chromium compound is covered with rhodium promoter to prevent the occurrence of adverse side effects.

With this type of method, the technology is improved to achieve a higher external quantum efficiency score (the proportion of photons in the photocatalyst used to split water molecules). When irradiated light was used for testing and the technique was used with a photocatalyst, the external quantum efficiency fraction reached 96%. However, more work needs to be done before the technology can be applied to the real world. The researchers said that their research shows that this method is feasible. (Yu Qiuyun)

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