Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scalable spray-coated graphene-based electrodes for high-power
  electrochemical double-layer capacitors operating over a wide range of
  temperature   Advancements in electrochemical double-layer capacitor (EDLC) technology
require the concomitant use of novel efficient electrode materials and viable
electrode manufacturing methods. Cost-effectiveness, scalability and
sustainability are key-drivers for fulfilling product development chain
accepted by worldwide legislations. Herein, we report a scalable and sprayable
"green" electrode material-based ink based on activated carbon and
single-/few-layer graphene (SLG/FLG) flakes. We show that, contrary to
commercial reduced graphene oxide, defect-free and flat SLG/FLG flakes reduce
the friction of ions over the electrode films, while spray coating deposition
of our ink maximises the electrolyte accessibility to the electrode surface
area. Sprayed SLG/FLG flakes-based EDLCs display superior rate capability
performance (e.g., specific energies of 31.5, 23.7 and 12.5 Wh kg-1 at specific
powers of 150, 7500 and 30000 W kg-1, respectively) compared to both SLG/FLG
flakes-free devices and commercial-like EDLCs produced by slurry-coating
method. The use of SLG/FLG flakes enables our sprayed EDLCs to operate in a
wide range of temperature (-40/+100{\deg}C) compatible with ionic
liquid/organic solvent-based electrolytes, overcoming the specific power limits
of AC-based EDLCs. A prototype EDLCs stack consisting of multiple large-area
EDLCs, each one displaying a capacitance of 25 F, demonstrates the industrial
potential of our technology.

0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex