Using Surface Segregation To Design Stable Ru‐Ir Oxides for the Oxygen Evolution Reaction in Acidic Environments |
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Authors: | Dr. Nemanja Danilovic Dr. Ramachandran Subbaraman Dr. Kee Chul Chang Dr. Seo Hyoung Chang Dr. Yijin Kang Dr. Joshua Snyder Dr. Arvydas Paul Paulikas Dr. Dusan Strmcnik Prof. Yong Tae Kim Dr. Deborah Myers Dr. Vojislav R. Stamenkovic Dr. Nenad M. Markovic |
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Affiliation: | 1. Materials Science Division, Argonne National Laboratory, 9700 Cass Ave, Argonne, IL 60439 (USA);2. Pusan National University, 30 Jangjeon‐dong, Geumjeong‐gu, Busan 609‐735 (Korea);3. Chemical Science and Engineering Division, Argonne National Laboratory, 9700 Cass Ave, Argonne, IL 60439 (USA) |
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Abstract: | 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 Ru0.5Ir0.5 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. |
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Keywords: | iridium oxides oxygen evolution reaction ruthenium surface chemistry |
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