  Since two-dimensional boron sheet (borophene) synthesized on Ag substrates in
2015, research on borophene has grown fast in the fields of condensed matter
physics, chemistry, material science, and nanotechnology. Due to the unique
physical and chemical properties, borophene has various potential applications.
In this review, we summarize the progress on borophene with a particular
emphasis on the recent advances. First, we introduce the phases of borophene by
experimental synthesis and theoretical predictions. Then, the physical and
chemical properties, such as mechanical, thermal, electronic, optical and
superconducting properties are summarized. We also discuss in detail the
utilization of the borophene for wide ranges of potential application among the
alkali metal ion batteries, Li-S batteries, hydrogen storage, supercapacitor,
sensor and catalytic in hydrogen evolution, oxygen reduction, oxygen evolution,
and CO2 electroreduction reaction. Finally, the challenges and outlooks in this
promising field are featured on the basis of its current development.
