Preparation of Solid Solution and Layered IrO x-Ni(OH)2Oxygen Evolution Catalysts: Toward Optimizing Iridium Efficiency for OER

Jonathan Ruiz Esquius; Gerardo Algara-Siller; Ioannis Spanos; Simon J. Freakley; Robert Schlögl; Graham J. Hutchings

doi:10.1021/acscatal.0c03866

Preparation of Solid Solution and Layered IrO _x-Ni(OH)₂Oxygen Evolution Catalysts: Toward Optimizing Iridium Efficiency for OER

Jonathan Ruiz Esquius, Gerardo Algara-Siller, Ioannis Spanos, Simon J. Freakley, Robert Schlögl, Graham J. Hutchings

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

8 Citations (SciVal)

18 Downloads (Pure)

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.

Original language	English
Pages (from-to)	14640-14648
Number of pages	9
Journal	ACS Catalysis
Volume	10
Issue number	24
Early online date	26 Nov 2020
DOIs	https://doi.org/10.1021/acscatal.0c03866
Publication status	Published - 18 Dec 2020

Keywords

amorphous iridium oxo-hydroxide
electrocatalysis
hydrothermal synthesis
iridium nickel mixed oxide
iridium oxide
oxygen evolution reaction

ASJC Scopus subject areas

Catalysis
Chemistry(all)

Access to Document

10.1021/acscatal.0c03866

Preparation of solid solution and layered IrOx-Ni(OH)2 OER catalysts- Towards optimising Ir efficiency for OER.PDF
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Catal, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acscatal.0c03866
Accepted author manuscript, 912 KB
Preparation of solid solution and layered IrOx-Ni(OH)2 OER catalysts- Towards optimising Ir efficiency for OER-SI.PDF
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Catal, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acscatal.0c03866
Accepted author manuscript, 1.08 MB

Cite this

@article{e94c7de9b69a47909f7d8c22cefa2a97,

title = "Preparation of Solid Solution and Layered IrO x-Ni(OH)2Oxygen Evolution Catalysts: Toward Optimizing Iridium Efficiency for OER",

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. ",

keywords = "amorphous iridium oxo-hydroxide, electrocatalysis, hydrothermal synthesis, iridium nickel mixed oxide, iridium oxide, oxygen evolution reaction",

author = "{Ruiz Esquius}, Jonathan and Gerardo Algara-Siller and Ioannis Spanos and Freakley, {Simon J.} and Robert Schl{\"o}gl and Hutchings, {Graham J.}",

note = "Funding Information: We would like to show our gratitude to the MaxNet Energy research consortium for financial support. We would also like to thank Drs. Rosa Arrigo and Diego Gianolio from B18, Diamond Light Source at Harwell, for assisting us in the XAS spectroscopy experiment and providing the required sealed electrochemical cell. Finally, we would like to thank Dr. David J. Morgan for his assistance in XPS measurements. Publisher Copyright: {\textcopyright} Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

year = "2020",

month = dec,

day = "18",

doi = "10.1021/acscatal.0c03866",

language = "English",

volume = "10",

pages = "14640--14648",

journal = "ACS Catalysis",

issn = "2155-5435",

publisher = "American Chemical Society",

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T1 - Preparation of Solid Solution and Layered IrO x-Ni(OH)2Oxygen Evolution Catalysts

T2 - Toward Optimizing Iridium Efficiency for OER

AU - Ruiz Esquius, Jonathan

AU - Algara-Siller, Gerardo

AU - Spanos, Ioannis

AU - Freakley, Simon J.

AU - Schlögl, Robert

AU - Hutchings, Graham J.

N1 - Funding Information: We would like to show our gratitude to the MaxNet Energy research consortium for financial support. We would also like to thank Drs. Rosa Arrigo and Diego Gianolio from B18, Diamond Light Source at Harwell, for assisting us in the XAS spectroscopy experiment and providing the required sealed electrochemical cell. Finally, we would like to thank Dr. David J. Morgan for his assistance in XPS measurements. Publisher Copyright: © Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/12/18

Y1 - 2020/12/18

N2 - 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.

AB - 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.

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KW - hydrothermal synthesis

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