Octahedral Co3O4/carbon nanofiber composite-supported Pt catalysts for improved methanol electrooxidation

Hyelan An; Geon Hyoung An; Hyo Jin Ahn

doi:10.1016/j.jallcom.2015.05.105

Octahedral Co₃O₄/carbon nanofiber composite-supported Pt catalysts for improved methanol electrooxidation

Hyelan An
, Geon Hyoung An
, Hyo Jin Ahn

Department of Energy and Materials Engineering

Seoul National University of Science and Technology (SNUST)

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

36 Scopus citations

Abstract

Octahedral Co₃O₄/carbon nanofibers (CNFs) composite-supported Pt catalysts are synthesized using electrospinning, hydrothermal, and reduction methods in sequence, and their structure, chemical bonding states, and electrochemical properties are investigated. To obtain the optimal support, the relative molar ratio of the Co precursor to the solution was adjusted to three different levels: 0.05 M (sample A), 0.1 M (sample B), and 0.2 M Co precursor (sample C). Sample B exhibited the highest electrocatalytic activity of ∼415.6 mA mg_pt^-1 and superb electrocatalytic stability compared to commercial Pt/C, Pt/conventional CNFs, sample A, and sample C. This performance improvement can be explained by the combined effects of optimally sized octahedral Co₃O₄ on the CNF matrix, resulting in the maximum dispersion of Pt catalysts, and the formation of Co(OH)₂ phases, which hinder CO poisoning.

Original language	English
Pages (from-to)	317-321
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	645
DOIs	https://doi.org/10.1016/j.jallcom.2015.05.105
State	Published - 26 May 2015

Keywords

A hydrothermal method
Electrocatalytic stability
Electrospinning
Methanol electrooxidation
Octahedral CoO/CNF composites
Pt catalysts

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10.1016/j.jallcom.2015.05.105

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@article{f9bcd9dcd4fb4f80b9e0f6d9cb683d20,

title = "Octahedral Co3O4/carbon nanofiber composite-supported Pt catalysts for improved methanol electrooxidation",

abstract = "Octahedral Co3O4/carbon nanofibers (CNFs) composite-supported Pt catalysts are synthesized using electrospinning, hydrothermal, and reduction methods in sequence, and their structure, chemical bonding states, and electrochemical properties are investigated. To obtain the optimal support, the relative molar ratio of the Co precursor to the solution was adjusted to three different levels: 0.05 M (sample A), 0.1 M (sample B), and 0.2 M Co precursor (sample C). Sample B exhibited the highest electrocatalytic activity of ∼415.6 mA mgpt-1 and superb electrocatalytic stability compared to commercial Pt/C, Pt/conventional CNFs, sample A, and sample C. This performance improvement can be explained by the combined effects of optimally sized octahedral Co3O4 on the CNF matrix, resulting in the maximum dispersion of Pt catalysts, and the formation of Co(OH)2 phases, which hinder CO poisoning.",

keywords = "A hydrothermal method, Electrocatalytic stability, Electrospinning, Methanol electrooxidation, Octahedral CoO/CNF composites, Pt catalysts",

author = "Hyelan An and An, \{Geon Hyoung\} and Ahn, \{Hyo Jin\}",

year = "2015",

month = may,

day = "26",

doi = "10.1016/j.jallcom.2015.05.105",

language = "English",

volume = "645",

pages = "317--321",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Octahedral Co3O4/carbon nanofiber composite-supported Pt catalysts for improved methanol electrooxidation

AU - An, Hyelan

AU - An, Geon Hyoung

AU - Ahn, Hyo Jin

PY - 2015/5/26

Y1 - 2015/5/26

N2 - Octahedral Co3O4/carbon nanofibers (CNFs) composite-supported Pt catalysts are synthesized using electrospinning, hydrothermal, and reduction methods in sequence, and their structure, chemical bonding states, and electrochemical properties are investigated. To obtain the optimal support, the relative molar ratio of the Co precursor to the solution was adjusted to three different levels: 0.05 M (sample A), 0.1 M (sample B), and 0.2 M Co precursor (sample C). Sample B exhibited the highest electrocatalytic activity of ∼415.6 mA mgpt-1 and superb electrocatalytic stability compared to commercial Pt/C, Pt/conventional CNFs, sample A, and sample C. This performance improvement can be explained by the combined effects of optimally sized octahedral Co3O4 on the CNF matrix, resulting in the maximum dispersion of Pt catalysts, and the formation of Co(OH)2 phases, which hinder CO poisoning.

AB - Octahedral Co3O4/carbon nanofibers (CNFs) composite-supported Pt catalysts are synthesized using electrospinning, hydrothermal, and reduction methods in sequence, and their structure, chemical bonding states, and electrochemical properties are investigated. To obtain the optimal support, the relative molar ratio of the Co precursor to the solution was adjusted to three different levels: 0.05 M (sample A), 0.1 M (sample B), and 0.2 M Co precursor (sample C). Sample B exhibited the highest electrocatalytic activity of ∼415.6 mA mgpt-1 and superb electrocatalytic stability compared to commercial Pt/C, Pt/conventional CNFs, sample A, and sample C. This performance improvement can be explained by the combined effects of optimally sized octahedral Co3O4 on the CNF matrix, resulting in the maximum dispersion of Pt catalysts, and the formation of Co(OH)2 phases, which hinder CO poisoning.

KW - A hydrothermal method

KW - Electrocatalytic stability

KW - Electrospinning

KW - Methanol electrooxidation

KW - Octahedral CoO/CNF composites

KW - Pt catalysts

UR - https://www.scopus.com/pages/publications/84929998218

U2 - 10.1016/j.jallcom.2015.05.105

DO - 10.1016/j.jallcom.2015.05.105

M3 - Article

AN - SCOPUS:84929998218

SN - 0925-8388

VL - 645

SP - 317

EP - 321

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Octahedral Co₃O₄/carbon nanofiber composite-supported Pt catalysts for improved methanol electrooxidation

Abstract

Keywords

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