CeO2/Co(OH)2 hybrid electrocatalysts for efficient hydrogen and oxygen evolution reaction

Myeong Chang Sung; Gwang Hee Lee; Dong Wan Kim

doi:10.1016/j.jallcom.2019.06.047

CeO₂/Co(OH)₂ hybrid electrocatalysts for efficient hydrogen and oxygen evolution reaction

Myeong Chang Sung, Gwang Hee Lee, Dong Wan Kim

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

60 Citations (Scopus)

Abstract

Hybrid catalyst has been intensively studied over the past decades due to its advantages in many applications. It has been shown that CeO₂ nanoplates with an average diameter of 18.6 nm have uniform contact with Co(OH)₂. The objective of the present study was to comprehensively investigate CeO₂/Co(OH)₂ hybrid catalysts using various structural and electrochemical analysis to understand the synergetic effect between CeO₂ and Co(OH)₂ beneficial interaction on oxygen evolution and hydrogen evolution reaction (OER and HER) characteristics. OER/HER results showed excellent catalytic activity of CeO₂/Co(OH)₂ hybrid catalysts with an overpotential of 410 (OER) and 317 mV (HER) compared to pure CeO₂ nanoplates and Co(OH)₂ powder. Corresponding Tafel slopes of CeO₂/Co(OH)₂ hybrid catalysts for OER and HER were 66 and 140 mV dec⁻¹, respectively, lower than those of evaluated CeO₂ nanoplates and Co(OH)₂ powder. Compared to bare CeO₂ nanoplates and Co(OH)₂, CeO₂/Co(OH)₂ hybrid catalysts exhibited remarkably enhanced electrocatalytic activity for OER and HER.

Original language	English
Pages (from-to)	450-455
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	800
DOIs	https://doi.org/10.1016/j.jallcom.2019.06.047
Publication status	Published - 2019 Sept 5

Bibliographical note

Funding Information:
This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea ( 2016M3A7B4909318 ), by the R&D Center for Valuable Recycling (Global-Top R&BD Program) of the Ministry of Environment, South Korea (Project No.: R2-17_2016002250005 ), and by a Korea University Grant, South Korea .

Funding Information:
This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea (2016M3A7B4909318), by the R&D Center for Valuable Recycling (Global-Top R&BD Program) of the Ministry of Environment, South Korea (Project No.: R2-17_2016002250005), and by a Korea University Grant, South Korea.

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

CeO
Co(OH)
Hybrid catalyst
Hydrogen evolution reaction
Oxygen evolution reaction

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2019.06.047

Cite this

@article{36a60d2ca14e49b4bbe3147c84576545,

title = "CeO2/Co(OH)2 hybrid electrocatalysts for efficient hydrogen and oxygen evolution reaction",

abstract = "Hybrid catalyst has been intensively studied over the past decades due to its advantages in many applications. It has been shown that CeO2 nanoplates with an average diameter of 18.6 nm have uniform contact with Co(OH)2. The objective of the present study was to comprehensively investigate CeO2/Co(OH)2 hybrid catalysts using various structural and electrochemical analysis to understand the synergetic effect between CeO2 and Co(OH)2 beneficial interaction on oxygen evolution and hydrogen evolution reaction (OER and HER) characteristics. OER/HER results showed excellent catalytic activity of CeO2/Co(OH)2 hybrid catalysts with an overpotential of 410 (OER) and 317 mV (HER) compared to pure CeO2 nanoplates and Co(OH)2 powder. Corresponding Tafel slopes of CeO2/Co(OH)2 hybrid catalysts for OER and HER were 66 and 140 mV dec−1, respectively, lower than those of evaluated CeO2 nanoplates and Co(OH)2 powder. Compared to bare CeO2 nanoplates and Co(OH)2, CeO2/Co(OH)2 hybrid catalysts exhibited remarkably enhanced electrocatalytic activity for OER and HER.",

keywords = "CeO, Co(OH), Hybrid catalyst, Hydrogen evolution reaction, Oxygen evolution reaction",

author = "Sung, {Myeong Chang} and Lee, {Gwang Hee} and Kim, {Dong Wan}",

note = "Funding Information: This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea ( 2016M3A7B4909318 ), by the R&D Center for Valuable Recycling (Global-Top R&BD Program) of the Ministry of Environment, South Korea (Project No.: R2-17_2016002250005 ), and by a Korea University Grant, South Korea . Funding Information: This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea (2016M3A7B4909318), by the R&D Center for Valuable Recycling (Global-Top R&BD Program) of the Ministry of Environment, South Korea (Project No.: R2-17_2016002250005), and by a Korea University Grant, South Korea. Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = sep,

day = "5",

doi = "10.1016/j.jallcom.2019.06.047",

language = "English",

volume = "800",

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journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - CeO2/Co(OH)2 hybrid electrocatalysts for efficient hydrogen and oxygen evolution reaction

AU - Sung, Myeong Chang

AU - Lee, Gwang Hee

AU - Kim, Dong Wan

N1 - Funding Information: This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea ( 2016M3A7B4909318 ), by the R&D Center for Valuable Recycling (Global-Top R&BD Program) of the Ministry of Environment, South Korea (Project No.: R2-17_2016002250005 ), and by a Korea University Grant, South Korea . Funding Information: This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea (2016M3A7B4909318), by the R&D Center for Valuable Recycling (Global-Top R&BD Program) of the Ministry of Environment, South Korea (Project No.: R2-17_2016002250005), and by a Korea University Grant, South Korea. Publisher Copyright: © 2019 Elsevier B.V.

PY - 2019/9/5

Y1 - 2019/9/5

N2 - Hybrid catalyst has been intensively studied over the past decades due to its advantages in many applications. It has been shown that CeO2 nanoplates with an average diameter of 18.6 nm have uniform contact with Co(OH)2. The objective of the present study was to comprehensively investigate CeO2/Co(OH)2 hybrid catalysts using various structural and electrochemical analysis to understand the synergetic effect between CeO2 and Co(OH)2 beneficial interaction on oxygen evolution and hydrogen evolution reaction (OER and HER) characteristics. OER/HER results showed excellent catalytic activity of CeO2/Co(OH)2 hybrid catalysts with an overpotential of 410 (OER) and 317 mV (HER) compared to pure CeO2 nanoplates and Co(OH)2 powder. Corresponding Tafel slopes of CeO2/Co(OH)2 hybrid catalysts for OER and HER were 66 and 140 mV dec−1, respectively, lower than those of evaluated CeO2 nanoplates and Co(OH)2 powder. Compared to bare CeO2 nanoplates and Co(OH)2, CeO2/Co(OH)2 hybrid catalysts exhibited remarkably enhanced electrocatalytic activity for OER and HER.

AB - Hybrid catalyst has been intensively studied over the past decades due to its advantages in many applications. It has been shown that CeO2 nanoplates with an average diameter of 18.6 nm have uniform contact with Co(OH)2. The objective of the present study was to comprehensively investigate CeO2/Co(OH)2 hybrid catalysts using various structural and electrochemical analysis to understand the synergetic effect between CeO2 and Co(OH)2 beneficial interaction on oxygen evolution and hydrogen evolution reaction (OER and HER) characteristics. OER/HER results showed excellent catalytic activity of CeO2/Co(OH)2 hybrid catalysts with an overpotential of 410 (OER) and 317 mV (HER) compared to pure CeO2 nanoplates and Co(OH)2 powder. Corresponding Tafel slopes of CeO2/Co(OH)2 hybrid catalysts for OER and HER were 66 and 140 mV dec−1, respectively, lower than those of evaluated CeO2 nanoplates and Co(OH)2 powder. Compared to bare CeO2 nanoplates and Co(OH)2, CeO2/Co(OH)2 hybrid catalysts exhibited remarkably enhanced electrocatalytic activity for OER and HER.

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KW - Co(OH)

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KW - Hydrogen evolution reaction

KW - Oxygen evolution reaction

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DO - 10.1016/j.jallcom.2019.06.047

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