Presentation Information
[3C15]Formation of highly dispersed Mg on hydrogen deficient HB nanosheets
*Natsumi Noguchi1, Kazuho Goto1, Shin-ichi Ito1, Takeshi Fujita2, Yasunobu Ando3, Yoko Saito3, Hideo Hosono4,5, Shin-ichi Orimo6,7, Takahiro Kondo1,6,8 (1. Institute of Pure and Applied Sciences, University of Tsukuba, 2. School of Environmental Science and Engineering, Kochi University of Technology, 3. Laboratory for Chemistry and Life Science, Institute of Science Tokyo, 4. International Research Frontiers initiative (IRFI), MDX Research Center for Element Strategy (MDXES), Institute of Science Tokyo, 5. Research Center for Material Nanoarchitectonics, National Institute for Material Science, 6. WPI-AIMR The Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 7. Institute for Materials Research (IMR), Tohoku University, 8. Hydrogen Boride Research Center, Tsukuba Advanced Research Institute, University of Tsukuba)
Hydrogen boride (HB) nanosheets, discovered in 2017, exhibit unique properties like hydrogen release, catalytic activity, and CO2 conversion. Doping them with light metals can improve hydrogen storage. Here, we report the synthesis of highly dispersed Mg on Hydrogen deficient HB nanosheets, obtained by heating HB nanosheets with ball-milled MgH2 at 823 K. Transmission electron microscopy showed that Mg atoms were highly dispersed on the HB surface. In contrast to MgH2 alone—which showed peaks for Mg and MgO—XRD of HB-containing samples showed only MgO, indicating that HB suppresses Mg aggregation. XPS confirmed B–Mg bonding with Bδ-. Temperature-dependent XRD revealed that hydrogen release precedes Mg dispersion, consistent with first principles DFT calculations. Löwdin analysis showed Mg carries ~+1.36 electrons, which is similar to the valence state in crystalline MgB2. These results demonstrate a solid-state route to embed Mg domains within 2D boron frameworks.