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Assessment of Constant-Potential Implicit Solvation Calculations of Electrochemical Energy Barriers for H2 evolution on Pt

preprint
revised on 10.12.2018, 15:27 and posted on 10.12.2018, 20:17 by Maxime Van den Bossche, Egill Skúlason, Christoph Rose-Petruck, Hannes Jonsson
Theoretical estimation of the activation energy of electrochemical reactions is of critical importance but remains challenging. In this work, we address the usage of an implicit solvation model for describing hydrogen evolution reaction steps on Pt(111) and Pt(110), and compare with the `extrapolation' approach as well as single-crystal measurements. We find that both methods yield qualitatively similar results, which are in fair agreement with the experimental data. Care should be taken, however, in addressing spurious electrostatic interactions between periodically repeated slabs in the VASPsol implementation. Considering the lower computational cost and higher flexibility of the implicit solvation approach, we expect this method to become a valuable tool in electrocatalysis.

Funding

NSF Grant CHE-1665372

History

Email Address of Submitting Author

mvdb@brown.edu

Institution

Brown University

Country

USA

ORCID For Submitting Author

0000-0002-0938-0156

Declaration of Conflict of Interest

no conflict of interest

Version Notes

Second version submitted to J Phys Chem C.

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