Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature-programmed reduction and dispersive X-ray absorption
  spectroscopy studies of CeO2-based nanopowders for intermediate-temperature
  Solid-Oxide Fuel Cell anodes   In this work, we study the influence of the average crystallite size and
dopant oxide on the reducibility of CeO2-based nanomaterials. Samples were
prepared from commercial Gd2O3-, Sm2O3- and Y2O3-doped CeO2 powders by
calcination at different temperatures ranging between 400 and 900C and
characterized by X-ray powder diffraction, transmission electron microscopy and
BET specific surface area. The reducibility of the samples was analyzed by
temperature-programmed reduction and in situ dispersive X-ray absorption
spectroscopy techniques. Our results clearly demonstrate that samples treated
at lower temperatures, of smallest average crystallite size and highest
specific surface areas, exhibit the best performance, while Gd2O3-doped ceria
materials display higher reducibility than Sm2O3- and Y2O3-doped CeO2.

18
The categories of this paper are: econ
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th