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IrOOH nanosheets as acid stable electrocatalysts for the oxygen evolution reaction

Abstract

In solids, heterogeneous catalysis is inherently bound to reactions on the surface. Yet, atomically efficient preparation of specific surfaces as well the characterization of their properties are impeding applications towards a clean energy future. Here, we present the synthesis of single layered IrOOH nanosheets, investigations of their structure as well as their electrochemical properties towards oxygen evolution under aqueous acidic conditions. The nanosheets are synthesized by treating bulk IrOOH with a tetrabutylammonium solution and subsequent washing. Electron diffraction shows that the triangular arrangement of edge sharing Ir(O,OH)6 octahedra found in the layers of bulk IrOOH is retained after exfoliation into single layers. When incorporated as an active component on Ti electrodes, the nanosheets exhibit a Tafel slope of 58(3) mV dec-1 and an overpotential of η10 mA cm-2 = 344(7) mV in 0.1 M HClO4, while retaining the trivalent oxidation state of iridium. They outperform bulk rutile-IrO2 and bulk IrOOH as electrocatalytic water oxidation catalysts under the same conditions. The results of this study on structure-property relationships of low valence IrOOH nanosheets offer new pathways for the development of atom efficient, robust and highly active oxygen evolution catalysts.

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Publication details

The article was received on 15 Aug 2018, accepted on 05 Oct 2018 and first published on 06 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA07950A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
  • Open access: Creative Commons BY license
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    IrOOH nanosheets as acid stable electrocatalysts for the oxygen evolution reaction

    D. Weber, L. M. Schoop, D. Wurmbrand, S. Laha, V. Duppel, F. Podjaski, K. Mueller, U. Starke and B. V. Lotsch, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07950A

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