Modelling the chronopotentiometric response of constant current hydrogen evolution from dilute solutions of strong acids
Year: 2024
Type: article
Abstract: Cathodic hydrogen generation from unstirred dilute acids (2 < p H < 7) often results in the vicinity of the electrode turning alkaline. Potential transients recorded at constant current exhibit a sharp step at the moment of surface neutralisation, and the stepped chronopotentiograms convey important information with regard to the rate of both the electrode reaction and of mass transport. Here we present a robust model that, although it contains only three variable parameters, can fit chronopotentiometric measurements. The reaction rate and charge transfer coefficients obtained from the fitting can be combined into a p H dependent exchange current density of HER that can be used for benchmarking the catalytic activity of different electrode materials , while the obtained diffusion coefficient can be applied in simple formulae to estimate the characteristic time of surface neutralisation and the rate of propagation of the neutrality front.
Source: Journal of Catalysis
Institutions: Eötvös Loránd University, University of Tartu, University of Bern
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,910
Funders: National Science Foundation, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Eesti Teadusagentuur, Haridus- ja Teadusministeerium, Magyar Tudományos Akadémia, Eötvös Loránd Tudományegyetem, Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, National Research, Development and Innovation Office, NCCR Catalysis
OpenAlex ID: W4405105317