Issue 20, 2021

Revisiting trends in the exchange current for hydrogen evolution

Abstract

Nørskov and collaborators proposed a simple kinetic model to explain the volcano relation for the hydrogen evolution reaction on transition metal surfaces such that j0 = k0fGH) where j0 is the exchange current density, fGH) is a function of the hydrogen adsorption free energy ΔGH as computed from density functional theory, and k0 is a universal rate constant. Herein, focusing on the hydrogen evolution reaction in acidic medium, we revisit the original experimental data and find that the fidelity of this kinetic model can be significantly improved by invoking metal-dependence on k0 such that the logarithm of k0 linearly depends on the absolute value of ΔGH. We further confirm this relationship using additional experimental data points obtained from a critical review of the available literature. Our analyses show that the new model decreases the discrepancy between calculated and experimental exchange current density values by up to four orders of magnitude. Furthermore, we show the model can be further improved using machine learning and statistical inference methods that integrate additional material properties.

Graphical abstract: Revisiting trends in the exchange current for hydrogen evolution

Supplementary files

Article information

Article type
Paper
Submitted
01 Jul 2021
Accepted
05 Sep 2021
First published
06 Sep 2021

Catal. Sci. Technol., 2021,11, 6832-6838

Revisiting trends in the exchange current for hydrogen evolution

T. T. Yang, R. B. Patil, J. R. McKone and W. A. Saidi, Catal. Sci. Technol., 2021, 11, 6832 DOI: 10.1039/D1CY01170G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements