| 초록 |
Hydrogen is considered as a keystone of next-generation decarbonized fuels, opening up an ultimate clean energy era. To accomplish sustainable hydrogen economy, a major determinant will be the development of safe and efficient hydrogen storage system along with other technologies such as hydrogen production and fuel cell. Metal hydrides have been explored as a promising hydrogen storage medium, attributed to their capability to reversibly store and release hydrogen. However, they suffer from sluggish hydrogen sorption kinetics and oxidative instability, restraining their practical use. We developed a multilaminate composite of metal nanocrystals and reduced graphene oxide (rGO) for safe and high-density hydrogen storage. Metal hydrides were exploited in a nanoscale to overcome the sluggish kinetics, while such nanocrystals were protected by rGO layers against oxidation. The encapsulation of metal nanocrystals by rGO was elaborately designed based on its selective permeation property of hydrogen gas molecules, along with an excellent mechanical characteristic. These multilaminate composites are able to deliver a remarkably dense hydrogen storage, also presenting a superior oxidative stability. The stable multilaminate of zero-valent metal nanocrystals and graphene derivatives can be extended to a variety of energy applications such as batteries, catalysis and energetic materials. |
