Iridium-cobalt alloy nanotubes as a bifunctional electrocatalyst for pH-universal overall water splitting

Yoonkyeong Kim; Areum Yu; Youngmi Lee

doi:10.1002/bkcs.12382

Iridium-cobalt alloy nanotubes as a bifunctional electrocatalyst for pH-universal overall water splitting

Yoonkyeong Kim, Areum Yu, Youngmi Lee

Department of Chemistry & Nanoscience

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

10 Scopus citations

Abstract

Bimetallic Ir_xCo_1−x alloy nanotubes (x = 0.25, 0.50 and 0.75, the atomic ratios of Ir precursor out of the total metal precursor) were prepared via the thermal H₂-reduction of Ir_xCo_1−xO_y nanotubes which were synthesized by electrospinning and post calcination. Ir and Co atoms were well mixed to form the alloy in Ir_xCo_1−x nanotubes. Their phase structures were different depending on the composition ratios. Ir_0.75Co_0.25 and Ir_0.50Co_0.50 had Ir fcc phase where some Ir atoms were substituted with Co. In contrast, Ir_0.25Co_0.75 was in Ir-substituting Co hcp phase. Among the Ir_xCo_1−x alloy nanotubes, Ir_0.50Co_0.50 showed the highest catalytic activity for overall electrochemical water splitting in acidic, neutral, and alkaline conditions, better than pure metallic Ir and Co counterparts. The activity and stability of Ir_0.50Co_0.50 nanotubes for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) were superior to commercial Ir/C and Pt/C, respectively.

Original language	English
Pages (from-to)	1524-1533
Number of pages	10
Journal	Bulletin of the Korean Chemical Society
Volume	42
Issue number	11
DOIs	https://doi.org/10.1002/bkcs.12382
State	Published - Nov 2021

Bibliographical note

Funding Information:
This work was financially supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning (NRF‐2020R1A2B5B01001984) and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF‐2018R1A6A1A03025340).

Funding Information:
National Research Foundation of Korea (NRF), Grant/Award Numbers: NRF‐2018R1A6A1A03025340, NRF‐2020R1A2B5B01001984 Funding information

Publisher Copyright:
© 2021 Korean Chemical Society and Wiley-VCH GmbH.

Keywords

alloy nanotube
cobalt
iridium
overall water splitting
pH-universal catalyst

Access to Document

10.1002/bkcs.12382

Cite this

@article{0c0e04e726104cc2bb08c7d23c3f0df0,

title = "Iridium-cobalt alloy nanotubes as a bifunctional electrocatalyst for pH-universal overall water splitting",

abstract = "Bimetallic IrxCo1−x alloy nanotubes (x = 0.25, 0.50 and 0.75, the atomic ratios of Ir precursor out of the total metal precursor) were prepared via the thermal H2-reduction of IrxCo1−xOy nanotubes which were synthesized by electrospinning and post calcination. Ir and Co atoms were well mixed to form the alloy in IrxCo1−x nanotubes. Their phase structures were different depending on the composition ratios. Ir0.75Co0.25 and Ir0.50Co0.50 had Ir fcc phase where some Ir atoms were substituted with Co. In contrast, Ir0.25Co0.75 was in Ir-substituting Co hcp phase. Among the IrxCo1−x alloy nanotubes, Ir0.50Co0.50 showed the highest catalytic activity for overall electrochemical water splitting in acidic, neutral, and alkaline conditions, better than pure metallic Ir and Co counterparts. The activity and stability of Ir0.50Co0.50 nanotubes for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) were superior to commercial Ir/C and Pt/C, respectively.",

keywords = "alloy nanotube, cobalt, iridium, overall water splitting, pH-universal catalyst",

author = "Yoonkyeong Kim and Areum Yu and Youngmi Lee",

note = "Funding Information: This work was financially supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning (NRF‐2020R1A2B5B01001984) and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF‐2018R1A6A1A03025340). Funding Information: National Research Foundation of Korea (NRF), Grant/Award Numbers: NRF‐2018R1A6A1A03025340, NRF‐2020R1A2B5B01001984 Funding information Publisher Copyright: {\textcopyright} 2021 Korean Chemical Society and Wiley-VCH GmbH.",

year = "2021",

month = nov,

doi = "10.1002/bkcs.12382",

language = "English",

volume = "42",

pages = "1524--1533",

journal = "Bulletin of the Korean Chemical Society",

issn = "0253-2964",

publisher = "Wiley-Blackwell",

number = "11",

}

TY - JOUR

T1 - Iridium-cobalt alloy nanotubes as a bifunctional electrocatalyst for pH-universal overall water splitting

AU - Kim, Yoonkyeong

AU - Yu, Areum

AU - Lee, Youngmi

N1 - Funding Information: This work was financially supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning (NRF‐2020R1A2B5B01001984) and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF‐2018R1A6A1A03025340). Funding Information: National Research Foundation of Korea (NRF), Grant/Award Numbers: NRF‐2018R1A6A1A03025340, NRF‐2020R1A2B5B01001984 Funding information Publisher Copyright: © 2021 Korean Chemical Society and Wiley-VCH GmbH.

PY - 2021/11

Y1 - 2021/11

N2 - Bimetallic IrxCo1−x alloy nanotubes (x = 0.25, 0.50 and 0.75, the atomic ratios of Ir precursor out of the total metal precursor) were prepared via the thermal H2-reduction of IrxCo1−xOy nanotubes which were synthesized by electrospinning and post calcination. Ir and Co atoms were well mixed to form the alloy in IrxCo1−x nanotubes. Their phase structures were different depending on the composition ratios. Ir0.75Co0.25 and Ir0.50Co0.50 had Ir fcc phase where some Ir atoms were substituted with Co. In contrast, Ir0.25Co0.75 was in Ir-substituting Co hcp phase. Among the IrxCo1−x alloy nanotubes, Ir0.50Co0.50 showed the highest catalytic activity for overall electrochemical water splitting in acidic, neutral, and alkaline conditions, better than pure metallic Ir and Co counterparts. The activity and stability of Ir0.50Co0.50 nanotubes for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) were superior to commercial Ir/C and Pt/C, respectively.

AB - Bimetallic IrxCo1−x alloy nanotubes (x = 0.25, 0.50 and 0.75, the atomic ratios of Ir precursor out of the total metal precursor) were prepared via the thermal H2-reduction of IrxCo1−xOy nanotubes which were synthesized by electrospinning and post calcination. Ir and Co atoms were well mixed to form the alloy in IrxCo1−x nanotubes. Their phase structures were different depending on the composition ratios. Ir0.75Co0.25 and Ir0.50Co0.50 had Ir fcc phase where some Ir atoms were substituted with Co. In contrast, Ir0.25Co0.75 was in Ir-substituting Co hcp phase. Among the IrxCo1−x alloy nanotubes, Ir0.50Co0.50 showed the highest catalytic activity for overall electrochemical water splitting in acidic, neutral, and alkaline conditions, better than pure metallic Ir and Co counterparts. The activity and stability of Ir0.50Co0.50 nanotubes for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) were superior to commercial Ir/C and Pt/C, respectively.

KW - alloy nanotube

KW - cobalt

KW - iridium

KW - overall water splitting

KW - pH-universal catalyst

UR - http://www.scopus.com/inward/record.url?scp=85113893610&partnerID=8YFLogxK

U2 - 10.1002/bkcs.12382

DO - 10.1002/bkcs.12382

M3 - Article

AN - SCOPUS:85113893610

SN - 0253-2964

VL - 42

SP - 1524

EP - 1533

JO - Bulletin of the Korean Chemical Society

JF - Bulletin of the Korean Chemical Society

IS - 11

ER -

Iridium-cobalt alloy nanotubes as a bifunctional electrocatalyst for pH-universal overall water splitting

Abstract

Bibliographical note

Keywords

Access to Document

Fingerprint

Cite this