skip to main content

DOE PAGESDOE PAGES

Title: A Theoretical Investigation into the Role of Surface Defects for Oxygen Evolution on RuO 2

Here, the inability of conventional theoretical models to corroborate the well-known experimental activity of RuO 2 for the oxygen evolution reaction (OER) has recently been the subject of numerous research efforts. In this study, we use density functional theory calculations to investigate the possibility that surface defects formed during dissolution are responsible for the OER activity of RuO 2. It has been well-established experimentally that RuO 2 undergoes dissolution during OER, yet little is known about the atomic structure or catalytic reactivity of the resulting defect sites. Through simulation of point defects, steps, and kinks derived from the RuO 2 (110) surface, we discover a 0.7 eV range in the primary descriptor for OER activity, with the most active sites outperforming those at the ideal (110) surface by nearly 0.5 eV. We postulate that these variations in reactivity are due to differences in the local electronic structure, and we investigate in more detail the electronic structure of two singly coordinated sites at the same Ru atom located at a kink. Finally, we investigate possible dissolution pathways that may proceed at the RuO 2 surface under OER conditions.
Authors:
ORCiD logo [1] ;  [1]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
DGE-114747; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 121; Journal Issue: 34; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1459579

Dickens, Colin F., and Norskov, Jens K.. A Theoretical Investigation into the Role of Surface Defects for Oxygen Evolution on RuO2. United States: N. p., Web. doi:10.1021/acs.jpcc.7b03481.
Dickens, Colin F., & Norskov, Jens K.. A Theoretical Investigation into the Role of Surface Defects for Oxygen Evolution on RuO2. United States. doi:10.1021/acs.jpcc.7b03481.
Dickens, Colin F., and Norskov, Jens K.. 2017. "A Theoretical Investigation into the Role of Surface Defects for Oxygen Evolution on RuO2". United States. doi:10.1021/acs.jpcc.7b03481. https://www.osti.gov/servlets/purl/1459579.
@article{osti_1459579,
title = {A Theoretical Investigation into the Role of Surface Defects for Oxygen Evolution on RuO2},
author = {Dickens, Colin F. and Norskov, Jens K.},
abstractNote = {Here, the inability of conventional theoretical models to corroborate the well-known experimental activity of RuO2 for the oxygen evolution reaction (OER) has recently been the subject of numerous research efforts. In this study, we use density functional theory calculations to investigate the possibility that surface defects formed during dissolution are responsible for the OER activity of RuO2. It has been well-established experimentally that RuO2 undergoes dissolution during OER, yet little is known about the atomic structure or catalytic reactivity of the resulting defect sites. Through simulation of point defects, steps, and kinks derived from the RuO2 (110) surface, we discover a 0.7 eV range in the primary descriptor for OER activity, with the most active sites outperforming those at the ideal (110) surface by nearly 0.5 eV. We postulate that these variations in reactivity are due to differences in the local electronic structure, and we investigate in more detail the electronic structure of two singly coordinated sites at the same Ru atom located at a kink. Finally, we investigate possible dissolution pathways that may proceed at the RuO2 surface under OER conditions.},
doi = {10.1021/acs.jpcc.7b03481},
journal = {Journal of Physical Chemistry. C},
number = 34,
volume = 121,
place = {United States},
year = {2017},
month = {8}
}