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Preparation of solid solution and layered IrOx–Ni(OH)2 oxygen evolution catalysts: toward optimizing iridium efficiency for OER

Ruiz Esquius, Jonathan, Algara-Siller, Gerardo, Spanos, Ioannis, Freakley, Simon J., Schlögl, Robert and Hutchings, Graham J. 2020. Preparation of solid solution and layered IrOx–Ni(OH)2 oxygen evolution catalysts: toward optimizing iridium efficiency for OER. ACS Catalysis 10 (24) , pp. 14640-14648. 10.1021/acscatal.0c03866
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Abstract

Minimizing iridium loading in oxygen evolution reaction (OER) catalysts, without impairing electrocatalytic activity and stability is crucial to reduce the cost of water electrolysis. In this work, two Ir0.5Ni0.5Ox mixed oxide catalysts with layered and solid solution morphologies were prepared by modifying a facile hydrothermal methodology. The catalytic OER activity and stability of the Ir–Ni catalyst with a homogeneous distribution (IrNi-HD) was seriously compromised compared to pure IrOx due to the high concentration of surface nickel prone to corrosion under reaction conditions. However, the design of layered IrOx–Ni(OH)x (IrNi-LY) with Ir at the exposed surface allowed a 50% reduction in the molar concentration of the precious metal on the electrode compared to IrOx without impairing the catalytic activity or stability. As a result, IrNi-LY outperformed IrOx in activity when normalized to the Ir mass.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 2155-5435
Date of First Compliant Deposit: 3 December 2020
Date of Acceptance: 13 November 2020
Last Modified: 13 Feb 2021 17:55
URI: http://orca.cf.ac.uk/id/eprint/136756

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