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Using Surface Segregation To Design Stable Ru‐Ir Oxides for the Oxygen Evolution Reaction in Acidic Environments
Author(s) -
Danilovic Nemanja,
Subbaraman Ramachandran,
Chang Kee Chul,
Chang Seo Hyoung,
Kang Yijin,
Snyder Joshua,
Paulikas Arvydas Paul,
Strmcnik Dusan,
Kim Yong Tae,
Myers Deborah,
Stamenkovic Vojislav R.,
Markovic Nenad M.
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201406455
Subject(s) - bimetallic strip , catalysis , oxygen evolution , oxygen , chemistry , thermal stability , chemical engineering , materials science , inorganic chemistry , organic chemistry , electrochemistry , electrode , engineering
The methods used to improve catalytic activity are well‐established, however elucidating the factors that simultaneously control activity and stability is still lacking, especially for oxygen evolution reaction (OER) catalysts. Here, by studying fundamental links between the activity and stability of well‐characterized monometallic and bimetallic oxides, we found that there is generally an inverse relationship between activity and stability. To overcome this limitation, we developed a new synthesis strategy that is based on tuning the near‐surface composition of Ru and Ir elements by surface segregation, thereby resulting in the formation of a nanosegregated domain that balances the stability and activity of surface atoms. We demonstrate that a Ru 0.5 Ir 0.5 alloy synthesized by using this method exhibits four‐times higher stability than the best Ru‐Ir oxygen evolution reaction materials, while still preserving the same activity.