The problem of graphene "stunning" to solve the problem of hydrogen production by photolysis
Science and Technology Daily News (reporter Wu Changfeng) the reporter learned from the University of Science and Technology of China research team led by Professor Luo Yi, Hefei National Laboratory for physical sciences at microscale, using the first principle calculation, puts forward the design material system the first water photolysis hydrogen storage integration, the scheme has the advantages of low cost, versatility, safety of hydrogen storage. Published in the "natural" communication on relevant results before the date.
The hydrogen economy is a perfect "sustainable" energy plan put forward in 1970s, which is driven by inexhaustible sunlight to decompose water into hydrogen and oxygen.
The reverse reaction is serious, difficult separation and hydrogen storage problem of water photolysis in the process of research was inspired: graphene can isolate all gases and liquids, but can be spared, and the proton release. Using this characteristic, a sandwich structure of two dimensional carbon and nitrogen materials and graphene based materials was designed.
In this sandwich structure system, carbon and nitrogen are sandwiched between two layers of functional groups of graphene. First principles calculations show that the excitons can be rapidly separated into high energy electrons and holes by the excitons generated by solar energy, and migrate into the middle carbon and nitrogen materials and outer graphene materials. And the water molecules adsorbed on the active site of the graphene based material can break up and produce protons with the help of photogenerated holes. These protons are driven by built-in electrostatic fields on carbon and nitrogen materials. They can penetrate graphene materials, move into the two-dimensional carbon and nitrogen materials, and react with electrons to produce hydrogen.
Because only the release of the graphene is only atomic hydrogen (protons), hydrogen is not produced by photolysis of water penetrating graphene materials, leading to molecular hydrogen produced by photolysis of water will be safely retained in the sandwich system, inhibition of reverse reaction, the hydrogen hydrogen storage safety rate under high storage.
This system has a low cost, which ingeniously inhibits the inverse reaction of hydrogen production by photolysis and realizes the effective purification of hydrogen. It will solve the two bottlenecks of the most difficult hydrogen separation and safe storage and transportation for large-scale applications of hydrogen, and open the door for the restart of the hydrogen energy economic era.
Graphene is expected to replace 13 rare metals.