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Title: Breaking $$\mathrm{OER}$$ and $$\mathrm{CER}$$ scaling relations via strain and its relaxation in $$\mathrm{RuO}$$2 (101)

Journal Article · · Materials Today Energy
 [1];  [2];  [1];  [2];  [2];  [2]; ORCiD logo [3]
  1. Oregon State University, Corvallis, OR (United States)
  2. University of Minnesota, Minneapolis, MN (United States)
  3. Oregon State University, Corvallis, OR (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Green hydrogen production from abundant water sources is an important component of renewable energy storage. Water oxidation catalysts are typically considered bound by adsorbate scaling relations, limiting their activity for the oxygen evolution reaction (OER) as well as selectivity between OER and the chlorine evolution reaction (CER) that compete in saline water streams. RuO2 is highly active for both reactions, and recent measurements have shown the OER activity is greater on undercoordinated, high index facets compared to the lowest-energy (110) facet often studied. The growth of such orientations as epitaxial films, however, can result in appreciable strain and potential surface faceting via its relaxation. Here, we find the activity and selectivity towards OER and CER vary with thickness in epitaxial (101) RuO2 thin films: OER activity decreases 4x as film thickness increases from 8 nm to 48 nm, while CER activity is comparable. Thus, strain and its relaxation can be used to break scaling relationships between OER and CER, highlighting the important role that defects play in selective oxidation processes on RuO2 in chloride-containing media.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); Vannevar Bush Faculty Fellowship
Grant/Contract Number:
AC05-76RL01830; 2041153; DMR-2011401; SC002021; FA9550-21-1-0025
OSTI ID:
1923652
Report Number(s):
PNNL-SA-181087
Journal Information:
Materials Today Energy, Vol. 28; ISSN 2468-6069
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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