Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cations determine the mechanism and selectivity of alkaline ORR on
  Pt(111)   The proton-coupled electron transfer (PCET) mechanism of oxygen reduction
reaction (ORR) is a long-standing issue in electrocatalysis. Despite decades of
research, factors determining the ORR-PCET mechanism performance, even on the
prototypical Pt(111) surface, as a function of the pH, electrolyte and
electrode potential remain unknown. Herein, we integrate advanced experiments,
simulations, and theory to study alkaline ORR on a well-defined Pt(111) in the
presence of different cations. We unveil a dual-cation effect where the cations
simultaneously determine the active electrode surface, i.e. Pt-O/OH formation,
and the competition between inner- and outer-sphere PCET steps. This finding
provides direct evidence that the electrolyte affects the pathways, activity,
and selectivity which has important consequences for the practical design of
electrochemical systems and computational catalyst screening studies, for
example. Our work shows that all components of the electrochemical interface,
not the surface alone, are integral in electrocatalysis.

28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph