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Hou, Shujin; Li, Weijin; Watzele, Sebastian; Kluge, Regina M.; Xue, Song; Yin, Shanshan; Jiang, Xinyu; Doeblinger, Markus; Welle, Alexander; Garlyyev, Batyr; Koch, Max; Mueller-Buschbaum, Peter; Woell, Christof; Bandarenka, Aliaksandr S. and Fischer, Roland A. (2021): Metamorphosis of Heterostructured Surface-Mounted Metal-Organic Frameworks Yielding Record Oxygen Evolution Mass Activities. In: Advanced Materials, Vol. 33, No. 38, 2103218

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Materials derived from surface-mounted metal-organic frameworks (SURMOFs) are promising electrocatalysts for the oxygen evolution reaction (OER). A series of mixed-metal, heterostructured SURMOFs is fabricated by the facile layer-by-layer deposition method. The obtained materials reveal record-high electrocatalyst mass activities of approximate to 2.90 kA g(-1) at an overpotential of 300 mV in 0.1 m KOH, superior to the benchmarking precious and nonprecious metal electrocatalysts. This property is assigned to the particular in situ self-reconstruction and self-activation of the SURMOFs during the immersion and the electrochemical treatment in alkaline aqueous electrolytes, which allows for the generation of NiFe (oxy)hydroxide electrocatalyst materials of specific morphology and microstructure.

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