Revealing the nature of active sites on Pt-Gd and Pt-Pr alloys during the oxygen reduction reaction // ACS Applied Materials and Interfaces 14 (2022) 19604-19613.
To optimize the performance of catalytic materials, it is paramount to elucidate the dependence of the chemical reactivity on the atomic arrangement of the catalyst surface. Therefore, identifying the nature...
Electrical
double-layer capacitance (C
DL) measurements
are among the key experiments in physical electrochemistry
aimed to understand the properties of electrified solid/liquid interfaces. C
DL serves as a critical parameter for developing
physical models of electrochemical interfaces. Palladium (Pd) electrodes
are among the most widely used functional materials in many applications,
including (electro)catalysis. In this work, we report on double-layer
capacitances of the basal plane Pd(111), Pd(100), and Pd(110) electrodes
in aqueous HClO4 electrolytes measured using electrochemical
impedance spectroscopy. Importantly, we find that the C
DL values estimated at the minima of the capacitance vs
electrode potential curves can be correlated with the density-functional-theory
(DFT)-calculated adsorption energies for water molecules and the coordination
of electrode surface atoms. Our results thus suggest that it might
be possible to find simple descriptors of the electrical double layer
(EDL) analogous to those used for functional electrode materials.
Taken together, such descriptors could be employed for efficient high-throughput
screening of various electrode/electrolyte interfaces, such as in
supercapacitor and electrocatalytic systems.
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