JACS Au· 2021Q1
Cation- and pH-Dependent Hydrogen Evolution and Oxidation Reaction Kinetics
- 353citations
- Q1SCImago
- 2021year
Short summary
Electrolyte cation choice and concentration significantly alter hydrogen evolution and oxidation reaction (HER/HOR) kinetics on platinum by changing interfacial water structure and hydrogen bonding.
AI-generated from the title and abstract; the full text is not read.
Key points
- Cation type and concentration directly impact HER/HOR kinetics on platinum.
- Interfacial water structure and hydrogen bonding are key mechanisms affected by cations.
- Decreased reorganization energy and increased reaction entropy correlate with faster kinetics.
- The dielectric constant at the electrified interface is lower than in the bulk electrolyte.
AI-generated from the title and abstract; the full text is not read.
Abstract
, which was accompanied by decreasing reorganization energy from the Marcus-Hush-Chidsey formalism and increasing reaction entropy. Invoking the Born model of reorganization energy and reaction entropy, the static dielectric constant of the electrolyte at the electrified interface was found to be significantly lower than that of bulk, decreasing with the structure-making tendency of cations at the negatively charged Pt surface. The physical origin of cation-dependent HER/HOR kinetics can be rationalized by an increase in concentration of cations on the negatively charged Pt surface, altering the interfacial water structure and the H-bonding network, which is supported by classical molecular dynamics simulation and surface-enhanced infrared absorption spectroscopy. This work highlights immense opportunities to control the reaction rates by tuning interfacial structures of cation and solvents.
The authors' abstract, as published at the source. JACS Au, 2021 · DOI ↗
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Field: Electrochemistry
ElectrochemistryChemistry