Graphene can block all gases and liquids. However, a joint study by Chinese and British researchers found that it had a "open side" of protons and was generously released. This discovery will revolutionize fuel cells and other hydrogen-powered technologies. It will also make it possible to produce air-powered generators. Related papers were published in the journal Nature.

In 2004, the team led by Sir Andrey Heim of the University of Manchester in the United Kingdom succeeded in separating the stable graphene for the first time. It is only one atom thick and has good barrier properties. It is widely used in anti-corrosion coatings and anti-seepage packaging. Its barrier performance is good to what extent? If you want to let the smallest hydrogen atom in all atoms pass through a thin monolayer of graphene, it will consume the "lifetime" of the universe.

Wu Heng'an from China University of Science and Technology and the team from Heim conducted a series of experiments to see if graphene also blocks protons. According to the Physicist Organization Network reported on November 26, contrary to previously pessimistic predictions, they found that protons easily penetrated the graphene sheets, and at the high temperatures and with the help of catalytic nanoparticles such as platinum, "pass" It will be smoother.

This discovery makes graphene and its similar material boron nitride an ideal material for making proton membranes, which are the core of modern fuel cell technology. Fuel cells use oxygen and hydrogen as fuels to convert chemical energy into electrical energy. This technique cannot be realized without the isolation of other objects and the proton-conducting membrane.

Although the concept is not new, fuel cell technology needs further development to make it more widely used. One of the major bottlenecks currently facing is the presence of fuel permeation problems in existing proton membranes, which will reduce the fuel cell power generation efficiency and durability of use.

This new study shows that the use of graphene or single-layer boron nitride can make existing proton membranes thinner, more efficient, and less fuel-infiltrating and less toxic - which can greatly enhance the competitiveness of fuel cells.

The study also proved that they can use this one-atom-thick film to extract hydrogen from moist air, so that they can make a mobile generator fueled with hydrogen extracted from the air.

The author of the paper, Dr. Masaro Lozada-Hidalgo, said: “We use small-scale film to do experiments, so naturally we won't get much hydrogen. But this is only the first step of discovery. The paper also wants to The relevant experts are aware of its application prospects, and it is still a long way to go before creating and testing such hydrogen collectors."

Postdoctoral researcher Hu Sheng added: “Because people currently have the capacity to produce graphene sheets several square meters in size, we hope to find a way to use this method as soon as possible to commercialize battery fuel.” (Zhang Galun)

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