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

DOI: 10.1021/acscatal.0c03866 DOI Help

Authors: Jonathan Ruiz Esquius (Cardiff Catalysis Institute, Cardiff University) , Gerardo Algara-Siller (Fritz-Haber-Institut der Max-Planck-Gesellschaft) , Simon J. Freakley (Cardiff Catalysis Institute, Cardiff University; University of Bath) , Robert Schlögl (Fritz- Haber-Institut der Max-Planck-Gesellschaft; Max Planck Institute for Chemical Energy Conversion) , Graham J. Hutchings (Cardiff Catalysis Institute, Cardiff University) , Ioannis Spanos (Max Planck Institute for Chemical Energy Conversion)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Catalysis

State: Published (Approved)
Published: November 2020
Diamond Proposal Number(s): 18701

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.

Journal Keywords: electrocatalysis; oxygen evolution reaction; iridium oxide; amorphous iridium oxo-hydroxide; hydrothermal synthesis; iridium

Subject Areas: Chemistry, Energy

Instruments: B18-Core EXAFS

Discipline Tags:

Catalysis Inorganic Chemistry Physical Chemistry Earth Sciences & Environment Climate Change Energy Energy Storage Sustainable Energy Systems Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS)