Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of Di-phenyl Siloxane on the Catalytic Activity of Pt on Carbon   The effect of silicone on the catalytic activity of Pt for oxygen reduction
and hydrogen adsorption was studied using di-phenyl siloxane as a source
compound at a rotating disc electrode (RDE). Di-phenyl siloxane did not affect
the catalytic activity of Pt when it was injected into the electrolyte.
However, it blocked the oxygen reduction reaction when it was premixed with the
catalyst. Proton transport was not blocked in either case. We postulate that
di-phenyl siloxane induces hydrophobicity and causes local water starvation
thereby blocking oxygen transport. Hence, the slow leaching of silicone seals
in a fuel cell could cause silicon accumulation in the electrode, which will
irreversibly degrade fuel cell performance by blocking oxygen transport to the
catalyst sites.

33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs