Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oxygen reduction mechanisms in nanostructured La0.8Sr0.2MnO3 cathodes
  for Solid Oxide Fuel Cells   In this work we outline the mechanisms contributing to the oxygen reduction
reaction in nanostructured cathodes of La0.8Sr0.2MnO3 (LSM) for Solid Oxide
Fuel Cells (SOFC). These cathodes, developed from LSM nanostructured tubes, can
be used at lower temperatures compared to microstructured ones, and this is a
crucial fact to avoid the degradation of the fuel cell components. This
reduction of the operating temperatures stems mainly from two factors: i) the
appearance of significant oxide ion diffusion through the cathode material in
which the nanostructure plays a key role and ii) an optimized gas phase
diffusion of oxygen through the porous structure of the cathode, which becomes
negligible. A detailed analysis of our Electrochemical Impedance Spectroscopy
supported by first principles calculations point towards an improved overall
cathodic performance driven by a fast transport of oxide ions through the
cathode surface.

17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph