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Title: A Theoretical Investigation into the Role of Surface Defects for Oxygen Evolution on RuO2

Journal Article · · Journal of Physical Chemistry. C
ORCiD logo [1];  [1]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

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.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
DGE-114747; AC02-76SF00515
OSTI ID:
1459579
Journal Information:
Journal of Physical Chemistry. C, Vol. 121, Issue 34; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Cited By (8)

The role of metastability in enhancing water-oxidation activity journal January 2019
An essential descriptor for the oxygen evolution reaction on reducible metal oxide surfaces journal January 2019
Revealing the structural transformation of rutile RuO 2 via in situ X-ray absorption spectroscopy during the oxygen evolution reaction journal January 2019
Water oxidation catalysis on reconstructed NaTaO 3 (001) surfaces journal January 2019
Increasing Chlorine Selectivity through Weakening of Oxygen Adsorbates at Surface in Cu Doped RuO 2 during Seawater Electrolysis journal January 2018
Controlling Stability and Selectivity in the Competing Chlorine and Oxygen Evolution Reaction over Transition Metal Oxide Electrodes journal July 2019
Water oxidation catalysis on reconstructed NaTaO₃ (001) surfaces text January 2019
The role of metastability in enhancing water-oxidation activity text January 2019

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