Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two Dimensional heterostructure and its application in efficient quantum
  energy storage   Portable miniaturized energy storage micro-supercapacitor has engrossed
significant attention due to its power source and energy storage capacity,
replacing batteries in ultra-small electronic devices. Fabrication with porous
and 2D graphitic nanomaterials with high conductivity and surface area signify
high performance of micro-supercapacitor. In order to satisfy the fast-growing
energy demands for the next-generation, we report performance and design of a
2D heterostructure of EDLC (g-C$_3$N$_4$) & pseudocapacitive (FeNi$_3$)
resulting low ionic diffusion path and prominent charge storage based on their
synergic functionalities. This heterostructure system shows an enhanced quantum
capacitance (38% enhancement) due to delocalized states near Fermi level.
Having achieved the areal capacitance of 19.21 mFcm$^{-2}$, capacitive
retention (94%), enhanced power density (17 fold) having ultrahigh energy
density of 0.30 Wh.cm$^{-3}$ and stability of the material even without any
obvious degradation after 1000 cycles, this smart heterostructure acts as a new
platform for designing high-performance in-plane micro-supercapacitor.

10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys