Ultrathin IrO2 Nanoneedles for Electrochemical Water Oxidation

Jinkyu Lim; Dongmin Park; Sun Seo Jeon; Chi Woo Roh; Juhyuk Choi; Daejin Yoon; Minju Park; Hyeyoung Jung; Hyunjoo Lee

doi:10.1002/adfm.201704796

Ultrathin IrO₂ Nanoneedles for Electrochemical Water Oxidation

Jinkyu Lim
, Dongmin Park
, Sun Seo Jeon
, Chi Woo Roh
, Juhyuk Choi
, Daejin Yoon
, Minju Park
, Hyeyoung Jung
, Hyunjoo Lee

Department of Energy and Environmental Engineering

Korea Advanced Institute of Science and Technology
Elchemtech Co. Ltd

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

308 Scopus citations

Abstract

Electrochemical water splitting is promising for utilizing intermittent renewable energy. The sluggish kinetics of the oxygen evolution reaction (OER), however, is a bottleneck in obtaining high efficiency. Only a few OER electrocatalysts have been developed for the use in acidic media despite the importance of a proton exchange membrane (PEM) water electrolyzer. IrO₂ is the only material that is both active and stable for the OER in highly corrosive acidic conditions. Herein, a facile and scalable synthesis of ultrathin IrO₂ nanoneedles is reported with a diameter of 2 nm using a modified molten salt method. The activity and durability for the OER are significantly enhanced on the ultrathin IrO₂ nanoneedles, compared to conventional nanoparticles. The ultrathin nanoneedles are successfully introduced to a PEM electrolyzer single cell with the enhanced cell performance.

Original language	English
Article number	1704796
Journal	Advanced Functional Materials
Volume	28
Issue number	4
DOIs	https://doi.org/10.1002/adfm.201704796
State	Published - 24 Jan 2018

Bibliographical note

Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei/1.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

durability
iridium oxide
nanoneedles
oxygen evolution reaction
water oxidation

Access to Document

10.1002/adfm.201704796

Cite this

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title = "Ultrathin IrO2 Nanoneedles for Electrochemical Water Oxidation",

abstract = "Electrochemical water splitting is promising for utilizing intermittent renewable energy. The sluggish kinetics of the oxygen evolution reaction (OER), however, is a bottleneck in obtaining high efficiency. Only a few OER electrocatalysts have been developed for the use in acidic media despite the importance of a proton exchange membrane (PEM) water electrolyzer. IrO2 is the only material that is both active and stable for the OER in highly corrosive acidic conditions. Herein, a facile and scalable synthesis of ultrathin IrO2 nanoneedles is reported with a diameter of 2 nm using a modified molten salt method. The activity and durability for the OER are significantly enhanced on the ultrathin IrO2 nanoneedles, compared to conventional nanoparticles. The ultrathin nanoneedles are successfully introduced to a PEM electrolyzer single cell with the enhanced cell performance.",

keywords = "durability, iridium oxide, nanoneedles, oxygen evolution reaction, water oxidation",

author = "Jinkyu Lim and Dongmin Park and Jeon, \{Sun Seo\} and Roh, \{Chi Woo\} and Juhyuk Choi and Daejin Yoon and Minju Park and Hyeyoung Jung and Hyunjoo Lee",

note = "Publisher Copyright: {\textcopyright} 2017 WILEY-VCH Verlag GmbH \& Co. KGaA, Weinhei/1.",

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doi = "10.1002/adfm.201704796",

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T1 - Ultrathin IrO2 Nanoneedles for Electrochemical Water Oxidation

AU - Lim, Jinkyu

AU - Park, Dongmin

AU - Jeon, Sun Seo

AU - Roh, Chi Woo

AU - Choi, Juhyuk

AU - Yoon, Daejin

AU - Park, Minju

AU - Jung, Hyeyoung

AU - Lee, Hyunjoo

PY - 2018/1/24

Y1 - 2018/1/24

N2 - Electrochemical water splitting is promising for utilizing intermittent renewable energy. The sluggish kinetics of the oxygen evolution reaction (OER), however, is a bottleneck in obtaining high efficiency. Only a few OER electrocatalysts have been developed for the use in acidic media despite the importance of a proton exchange membrane (PEM) water electrolyzer. IrO2 is the only material that is both active and stable for the OER in highly corrosive acidic conditions. Herein, a facile and scalable synthesis of ultrathin IrO2 nanoneedles is reported with a diameter of 2 nm using a modified molten salt method. The activity and durability for the OER are significantly enhanced on the ultrathin IrO2 nanoneedles, compared to conventional nanoparticles. The ultrathin nanoneedles are successfully introduced to a PEM electrolyzer single cell with the enhanced cell performance.

AB - Electrochemical water splitting is promising for utilizing intermittent renewable energy. The sluggish kinetics of the oxygen evolution reaction (OER), however, is a bottleneck in obtaining high efficiency. Only a few OER electrocatalysts have been developed for the use in acidic media despite the importance of a proton exchange membrane (PEM) water electrolyzer. IrO2 is the only material that is both active and stable for the OER in highly corrosive acidic conditions. Herein, a facile and scalable synthesis of ultrathin IrO2 nanoneedles is reported with a diameter of 2 nm using a modified molten salt method. The activity and durability for the OER are significantly enhanced on the ultrathin IrO2 nanoneedles, compared to conventional nanoparticles. The ultrathin nanoneedles are successfully introduced to a PEM electrolyzer single cell with the enhanced cell performance.

KW - durability

KW - iridium oxide

KW - nanoneedles

KW - oxygen evolution reaction

KW - water oxidation

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