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Issue 40, 2019
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Selective surface functionalization generating site-isolated Ir on a MnOx/N-doped carbon composite for robust electrocatalytic water oxidation

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Abstract

Water oxidation catalysis plays a pivotal role in the context of the worldwide interest for sustainable energy. Finding cost-effective and robust catalysts to replace the state-of-the-art noble metal materials is hence urgent. In this work, we develop a molecular iridium complex that selectively and uniformly anchors on the surface of manganese oxide which is interconnected with a nitrogen-doped carbon forming a nanorod material. In the subsequent pyrolysis step, isolated Ir atoms are created on the manganese oxide surface and they strongly interact with the adjacent Mn. Through physicochemical characterization and computational studies, we demonstrate that the incorporation of Ir single-atom species in the MnOx/N–C composite promotes the electrochemical water oxidation catalysis. The new material shows excellent activity in the oxygen evolution reaction in 0.1 M KOH with an overpotential of 250 mV at 10 mA cm−2. Importantly, compared to a sample conventionally prepared with H2IrCl6, the novel Ir–MnOx/N–C catalyst not only is more efficient, but also demonstrates improved redox stability without suffering from Ir leaching. Our approach opens up new opportunities for the rational design of site-isolated materials for catalysis in the field of energy applications.

Graphical abstract: Selective surface functionalization generating site-isolated Ir on a MnOx/N-doped carbon composite for robust electrocatalytic water oxidation

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Publication details

The article was received on 02 Aug 2019, accepted on 23 Sep 2019 and first published on 23 Sep 2019


Article type: Paper
DOI: 10.1039/C9TA08447A
J. Mater. Chem. A, 2019,7, 23098-23104

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    Selective surface functionalization generating site-isolated Ir on a MnOx/N-doped carbon composite for robust electrocatalytic water oxidation

    N. Yan, R. J. Detz, N. Govindarajan, J. M. Koelewijn, B. Hua, P. Li, E. J. Meijer and J. N. H. Reek, J. Mater. Chem. A, 2019, 7, 23098
    DOI: 10.1039/C9TA08447A

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