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- W2948115804 abstract "Abstract First‐row layered transition metal (oxy)(hydro)oxides (LTMOs) form an important class of earth‐abundant materials. They are well‐known as active alkaline oxygen evolution reaction (OER) catalysts, [1,5] and are also often used as metal‐ion battery anodes [6] or as metal‐air bifunctional electrodes. [7] However, their electrochemical activities, particularly for the oxygen reduction reaction (ORR), across the whole 3d ‐element series remain largely unexplored. In this work, we perform a systematic screening of these catalysts for both OER and ORR using a surface edge‐site model with exposed active sites for metal double hydroxides M(OH) 2 , oxyhydroxides MOOH and oxides MO 2 . We establish OER and ORR activities and scaling relations of the whole series across +2, +3 and +4 oxidation states, and successfully reproduce the experimental activities of a few pure layered (oxy)(hydro)oxides. We predict CoOOH/CoO 2 and NiOOH/NiO 2 as active and stable OER catalysts. We also predict Fe(OH) 2 /FeOOH, Mn(OH) 2 /MnOOH and Co(OH) 2 as active and stable ORR catalysts. This makes Co‐(oxy)(hydro)oxides only bifunctional catalyst in this series. Using linear regression, our results indicate that trends across the 3d ‐series can be obtained from only a few bulk, surface and atomic type descriptors. Particularly, we identify that the number of outer d ‐electrons at the surface‐active site as the most important descriptor of activity." @default.
- W2948115804 created "2019-06-14" @default.
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- W2948115804 date "2019-07-03" @default.
- W2948115804 modified "2023-10-12" @default.
- W2948115804 title "Trends in Oxygen Electrocatalysis of <i>3 d</i> ‐Layered (Oxy)(Hydro)Oxides" @default.
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- W2948115804 doi "https://doi.org/10.1002/cctc.201900846" @default.
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