Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electrochemical Capacitance of CO-terminated Pt(111) is Dominated by
  CO-Solvent Gap   The distribution of electric fields within the electrochemical double layer
depends on both the electrode and electrolyte in complex ways. These fields
strongly influence chemical dynamics in the electrode-electrolyte interface,
but cannot be measured directly with sub-molecular resolution. We report
experimental capacitance measurements for aqueous interfaces of CO-terminated
Pt(111). By comparing these measurements with first-principles
density-functional theory (DFT) calculations, we infer microscopic field
distributions and decompose contributions to the inverse capacitance from
various spatial regions of the interface. We find that the CO is strongly
electronically coupled to the Pt, and that most of the interfacial potential
difference appears across the gap between the terminating O and water, and not
across the CO molecule as previously hypothesized. This `gap capacitance'
resulting from hydrophobic termination lowers the overall capacitance of the
aqueous Pt-CO interface, and makes it less sensitive to electrolyte
concentration compared to the bare metal.

31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph