13 research outputs found
Hydrogenated Borophene Shows Catalytic Activity as Solid Acid
Hydrogen boride (HB) or hydrogenated borophene sheets are recently realized two-dimensional materials that are composed of only two light elements, boron and hydrogen. However, their catalytic activity has not been experimentally analyzed. Herein, we report the catalytic activity of HB sheets in ethanol reforming. HB sheets catalyze the conversion of ethanol to ethylene and water above 493 K with high selectivity, independent of the contact time, and with an apparent activation energy of 102.8 ± 5.5 kJ/mol. Hence, we identify that HB sheets act as solid-acid catalysts
Investigation of photo- and thermal isomerization pathways of azobenzene derivative in photostationary state generated by two-color excitation
Facile Endoperoxypropellane Synthesis by Manganese(III) Acetate-Mediated Aerobic Oxidation
Evolution of Light Absorption and Emission Characteristics of Organic Perylene Nanoparticles through Hydrothermal Process: Application to Solar Cells
Formation and Characterization of Hydrogen Boride Sheets Derived from MgB<sub>2</sub> by Cation Exchange
Two-dimensional
(2D) materials are promising for applications in
a wide range of fields because of their unique properties. Hydrogen
boride sheets, a new 2D material recently predicted from theory, exhibit
intriguing electronic and mechanical properties as well as hydrogen
storage capacity. Here, we report the experimental realization of
2D hydrogen boride sheets with an empirical formula of H<sub>1</sub>B<sub>1</sub>, produced by exfoliation and complete ion-exchange
between protons and magnesium cations in magnesium diboride (MgB<sub>2</sub>) with an average yield of 42.3% at room temperature. The
sheets feature an sp<sup>2</sup>-bonded boron planar structure without
any long-range order. A hexagonal boron network with bridge hydrogens
is suggested as the possible local structure, where the absence of
long-range order was ascribed to the presence of three different anisotropic
domains originating from the 2-fold symmetry of the hydrogen positions
against the 6-fold symmetry of the boron networks, based on X-ray
diffraction, X-ray atomic pair distribution functions, electron diffraction,
transmission electron microscopy, photo absorption, core-level binding
energy data, infrared absorption, electron energy loss spectroscopy,
and density functional theory calculations. The established cation-exchange
method for metal diboride opens new avenues for the mass production
of several types of boron-based 2D materials by countercation selection
and functionalization