According to the physicist organization network reported on the 18th, American researchers wrote in the latest issue of the Proceedings of the National Academy of Sciences that they have designed a new method for producing hydrogen fuel using solar energy, electrodes and seawater. More than 1000 hours, it is expected to be used in many fields.

The study ’s lead author and Stanford University chemistry professor Dai Hongjie said that hydrogen is an extremely attractive fuel. Hydrogen only generates water and does not release carbon dioxide, so it is expected to alleviate the worsening climate change problem.

Existing hydrolytic hydrogen production methods rely on highly pure water, because the negatively charged chloride in seawater will corrode the anode and shorten the service life of the equipment. The high-purity water is a precious resource, and the production cost is high.

Dai Hongjie's team found that if the anode is coated with a negatively charged coating, the coating will repel chloride and slow down the corrosion rate of the underlying metal.

In the new method, they laminated nickel-iron hydroxide on nickel sulfide, which was wrapped with a nickel foam core. Nickel foam acts as a conductor and carries current; nickel-iron hydroxide initiates electrolysis, separating water into oxygen and hydrogen. During electrolysis, nickel sulfide evolves into a negatively charged coating, and this layer repels chlorides, preventing them from contacting the core metal and slowing down the rate of corrosion.

The paper's co-author Michelle Kenny said that if there is no negatively charged coating, the anode can only work in seawater for about 12 hours; but under the protection of the coating, it can work for more than 1000 hours.

In addition, in the past, it was necessary to operate at low current for the decomposition of seawater to produce hydrogen fuel, because at higher currents, corrosion will occur, but the new model can run at 10 times the power, which helps it generate more quickly from seawater. hydrogen.

The team members also designed a solar demonstrator. Since there is no risk of salt corrosion, the new device can decompose seawater to produce hydrogen comparable to the existing pure water hydrogen production technology.

Dai Hongjie said that the new method will open the door to widespread use of hydrogen fuel. Moreover, since the process also produces oxygen, divers or submarines can take the device under the sea to make oxygen. (Reporter Liu Xia)

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