Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Operando Electrochemical Kinetics in Particulate Porous Electrodes by
  Quantifying the Mesoscale Spatiotemporal Heterogeneities   Electrochemical energy systems rely on particulate porous electrodes to store
or convert energies. While the three-dimensional porous structures were
introduced to maximize the interfacial area for better overall performance of
the system, spatiotemporal heterogeneities arose from materials thermodynamics
localize the charge transfer processes onto a limited portion of the available
interfaces. Here, we demonstrate a simple but precision method that can
directly track and analyze the operando (i.e. local and reacting) interfaces at
the mesoscale in a practical graphite porous electrode to obtain the true local
current density, which turned out to be two orders of magnitude higher than the
globally averaged current density adopted by existing studies. Our results
resolve the long-standing discrepancies between kinetics parameters derived
from electroanalytical measurements and from first principles predictions.
Contradictory to prevailing beliefs, the electrochemical dynamics is not
controlled by the solid-state diffusion process once the spatiotemporal
reaction heterogeneities emerge in porous electrodes.

10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph