Pt Dopant: Controlling the Ir Oxidation States toward Efficient and Durable Oxygen Evolution Reaction in Acidic Media

Songa Choi; Jongsik Park; Mrinal Kanti Kabiraz; Youngmin Hong; Taehyun Kwon; Taekyung Kim; Aram Oh; Hionsuck Baik; Minseop Lee; Seung Min Paek; Sang Il Choi; Kwangyeol Lee

doi:10.1002/adfm.202003935

Pt Dopant: Controlling the Ir Oxidation States toward Efficient and Durable Oxygen Evolution Reaction in Acidic Media

Songa Choi, Jongsik Park, Mrinal Kanti Kabiraz, Youngmin Hong, Taehyun Kwon, Taekyung Kim, Aram Oh, Hionsuck Baik, Minseop Lee, Seung Min Paek, Sang Il Choi, Kwangyeol Lee

Department of Chemistry

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

60 Citations (Scopus)

Abstract

Dissolution of Ir oxides in Ir-based catalysts, which is closely linked to the catalyst activity and stability toward the oxygen evolution reaction (OER) in acidic media, is a critical unresolved problem in the commercialization of water electrolysis. Doping foreign elements into the Ir oxides can accomplish an optimal combination of Ir oxidation states that is conducive to the leaching-resistance of active catalytic sites. Here, it is reported that Pt doping into IrO_x-based nanoframe is beneficial in both terms of activity and stability. The Pt-doped IrO_x-based nanoframe achieves the mass activity of 0.644 A mg⁻¹_Ir+Pt at 1.53 V_RHE, which is 15-fold higher than that of the commercial IrO₂. During the accelerated durability test, the Ir^IV-to-Ir^III ratio of 5 is maintained in the presence of Pt dopant to effectively mitigate the degradation of Ir catalyst, leading to the superb catalyst durability in acidic media.

Original language	English
Article number	2003935
Journal	Advanced Functional Materials
Volume	30
Issue number	38
DOIs	https://doi.org/10.1002/adfm.202003935
Publication status	Published - 2020 Sept 1

Bibliographical note

Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

doping
electrocatalysts
iridium oxides
oxidation states
oxygen evolution reaction

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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title = "Pt Dopant: Controlling the Ir Oxidation States toward Efficient and Durable Oxygen Evolution Reaction in Acidic Media",

abstract = "Dissolution of Ir oxides in Ir-based catalysts, which is closely linked to the catalyst activity and stability toward the oxygen evolution reaction (OER) in acidic media, is a critical unresolved problem in the commercialization of water electrolysis. Doping foreign elements into the Ir oxides can accomplish an optimal combination of Ir oxidation states that is conducive to the leaching-resistance of active catalytic sites. Here, it is reported that Pt doping into IrOx-based nanoframe is beneficial in both terms of activity and stability. The Pt-doped IrOx-based nanoframe achieves the mass activity of 0.644 A mg−1Ir+Pt at 1.53 VRHE, which is 15-fold higher than that of the commercial IrO2. During the accelerated durability test, the IrIV-to-IrIII ratio of 5 is maintained in the presence of Pt dopant to effectively mitigate the degradation of Ir catalyst, leading to the superb catalyst durability in acidic media.",

keywords = "doping, electrocatalysts, iridium oxides, oxidation states, oxygen evolution reaction",

author = "Songa Choi and Jongsik Park and Kabiraz, {Mrinal Kanti} and Youngmin Hong and Taehyun Kwon and Taekyung Kim and Aram Oh and Hionsuck Baik and Minseop Lee and Paek, {Seung Min} and Choi, {Sang Il} and Kwangyeol Lee",

note = "Publisher Copyright: {\textcopyright} 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2020",

month = sep,

day = "1",

doi = "10.1002/adfm.202003935",

language = "English",

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T1 - Pt Dopant

T2 - Controlling the Ir Oxidation States toward Efficient and Durable Oxygen Evolution Reaction in Acidic Media

AU - Choi, Songa

AU - Park, Jongsik

AU - Kabiraz, Mrinal Kanti

AU - Hong, Youngmin

AU - Kwon, Taehyun

AU - Kim, Taekyung

AU - Oh, Aram

AU - Baik, Hionsuck

AU - Lee, Minseop

AU - Paek, Seung Min

AU - Choi, Sang Il

AU - Lee, Kwangyeol

PY - 2020/9/1

Y1 - 2020/9/1

N2 - Dissolution of Ir oxides in Ir-based catalysts, which is closely linked to the catalyst activity and stability toward the oxygen evolution reaction (OER) in acidic media, is a critical unresolved problem in the commercialization of water electrolysis. Doping foreign elements into the Ir oxides can accomplish an optimal combination of Ir oxidation states that is conducive to the leaching-resistance of active catalytic sites. Here, it is reported that Pt doping into IrOx-based nanoframe is beneficial in both terms of activity and stability. The Pt-doped IrOx-based nanoframe achieves the mass activity of 0.644 A mg−1Ir+Pt at 1.53 VRHE, which is 15-fold higher than that of the commercial IrO2. During the accelerated durability test, the IrIV-to-IrIII ratio of 5 is maintained in the presence of Pt dopant to effectively mitigate the degradation of Ir catalyst, leading to the superb catalyst durability in acidic media.

AB - Dissolution of Ir oxides in Ir-based catalysts, which is closely linked to the catalyst activity and stability toward the oxygen evolution reaction (OER) in acidic media, is a critical unresolved problem in the commercialization of water electrolysis. Doping foreign elements into the Ir oxides can accomplish an optimal combination of Ir oxidation states that is conducive to the leaching-resistance of active catalytic sites. Here, it is reported that Pt doping into IrOx-based nanoframe is beneficial in both terms of activity and stability. The Pt-doped IrOx-based nanoframe achieves the mass activity of 0.644 A mg−1Ir+Pt at 1.53 VRHE, which is 15-fold higher than that of the commercial IrO2. During the accelerated durability test, the IrIV-to-IrIII ratio of 5 is maintained in the presence of Pt dopant to effectively mitigate the degradation of Ir catalyst, leading to the superb catalyst durability in acidic media.

KW - doping

KW - electrocatalysts

KW - iridium oxides

KW - oxidation states

KW - oxygen evolution reaction

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U2 - 10.1002/adfm.202003935

DO - 10.1002/adfm.202003935

M3 - Article

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SN - 1616-301X

VL - 30

JO - Advanced Functional Materials

JF - Advanced Functional Materials

IS - 38

M1 - 2003935

ER -

Pt Dopant: Controlling the Ir Oxidation States toward Efficient and Durable Oxygen Evolution Reaction in Acidic Media

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Keywords

ASJC Scopus subject areas

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