Presentation Information
[19p-P01-62]Effects of High-temperature Heating of Hydrogen Boride Sheets Under High-Hydrogen Partial Pressure
〇(M1)Yukihiro Yasuda1, Kazuho Goto1, Yuki Nakahara2, Reina Utsumi2, Hiroyuki Saitoh2, Satoshi Nakano3, Shin-ichi Ito1, Miwa Hikichi1, Shin-ichi Orimo4, Takahiro Kondo1 (1.Univ. Tsukuba, 2.QST, 3.NIMS, 4.Tohoku Univ.)
Keywords:
hydrogen boride sheets,hydrogen storage materials
In 2017, experimental realization of the hydrogen boride sheets (HB sheets) have been reported as a new 2D materials. HB sheets are composed of boron and hydrogen with stoichiometric 1:1. HB sheets theoretically take the structure of a six-membered ring of boron bridged by hydrogen, but it is only a local structure. In fact, it is reported that HB sheets have two types of bonds: one is three-center, two-electron bond (B-H-B bond) and the other is two-center, two-electron bond (B-H bond). HB sheets are expected to be used as a hydrogen storage material. It is estimated to exhibit a hydrogen storage of 8.5 wt% and releases hydrogen by heating. However, hydrogen dissociation temperature of HB sheets is very wide because of its structural inhomogeneity, so it is important to control its structure and evaluate hydrogen dissociation characteristics. In this study, HB sheets were heated under extreme conditions such as high-hydrogen partial pressure or ultrahigh pressure to induce structural changes while preventing the decomposition and desorption of hydrogen from the HB sheets. In the presentation, I will discuss the changes in physical properties due to heat treatment.