Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decoration of exfoliated black phosphorus with nickel nanoparticles and
  application in catalysis   Nickel nanoparticles were dispersed on the surface of exfoliated black
phosphorus and the resulting nanohybrid Ni/2DBP showed an improved stability
respect to pristine 2D BP when kept in ambient conditions in the darkness.
Ni/2DBP was applied as catalyst in the semihydrogenation of phenylacetylene and
exhibited high conversion and selectivity towards styrene. These features were
preserved after recycling tests revealing the high stability of the nanohybrid.

28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn