Phase and morphology control in the synthesis of Co3O4 nanosphere/α-Co(OH)2 nanosheet hybrids for application in supercapacitors

Er Chieh Cho; Cai Wan Chang-Jian; Jen Hsien Huang; Jia An Chou; Wei Lin Syu; Ying Lin Chen; Kuen Chan Lee; Yu Sheng Hsiao

doi:10.1016/j.jtice.2020.03.006

Phase and morphology control in the synthesis of Co₃O₄ nanosphere/α-Co(OH)₂ nanosheet hybrids for application in supercapacitors

Er Chieh Cho, Cai Wan Chang-Jian, Jen Hsien Huang, Jia An Chou, Wei Lin Syu, Ying Lin Chen, Kuen Chan Lee, Yu Sheng Hsiao

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

14 Citations (Scopus)

Abstract

In this study, we developed a facile chemical precipitation approach for the synthesis of heterogeneous Co₃O₄ nanosphere/Co(OH)₂ nanosheet hybrids in the presence of polyvinylpyrrolidone (PVP) as a phase-controlling reagent. The crystalline phase and morphology of the product varied upon changing the chain length of PVP (from 8k to 120k), with short-chain PVP favoring the formation of Co₃O₄ nanospheres and long-chain PVP favoring the synthesis of Co(OH)₂ nanosheets. Accordingly, heterogeneous Co₃O₄/Co(OH)₂ hybrids of various blending ratios were readily prepared in the presence of PVP of different molecular weights. The molecular weight of PVP also affected the electrochemical properties of the Co₃O₄ nanosphere/Co(OH)₂ nanosheet composites. When using PVP of moderate chain length (58k), the resultant Co₃O₄/Co(OH)₂ composite exhibited the optimal supercapacitive performance, characterized by an excellent specific capacitance of 771.2 F g⁻¹ at 1 A g⁻¹, and retained approximately 68.5% of this capacitance when operated at a high current density of 10 A g⁻¹. Furthermore, this composite displayed an excellent charge/discharge cycling life at a current density of 4 A g⁻¹, with a capacitance retention of 93.3% after 3000 repeated cycles.

Original language	English
Pages (from-to)	163-172
Number of pages	10
Journal	Journal of the Taiwan Institute of Chemical Engineers
Volume	110
DOIs	https://doi.org/10.1016/j.jtice.2020.03.006
Publication status	Published - May 2020

Keywords

Co(OH)
CoO
Microwave hydrothermal
PVP
Supercapacitor
Co(OH)2
Co3O4

ASJC Scopus subject areas

General Chemical Engineering
General Chemistry

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10.1016/j.jtice.2020.03.006

Cite this

@article{808cc595cc9645258dc6a94c1e4af3fb,

title = "Phase and morphology control in the synthesis of Co3O4 nanosphere/α-Co(OH)2 nanosheet hybrids for application in supercapacitors",

abstract = "In this study, we developed a facile chemical precipitation approach for the synthesis of heterogeneous Co3O4 nanosphere/Co(OH)2 nanosheet hybrids in the presence of polyvinylpyrrolidone (PVP) as a phase-controlling reagent. The crystalline phase and morphology of the product varied upon changing the chain length of PVP (from 8k to 120k), with short-chain PVP favoring the formation of Co3O4 nanospheres and long-chain PVP favoring the synthesis of Co(OH)2 nanosheets. Accordingly, heterogeneous Co3O4/Co(OH)2 hybrids of various blending ratios were readily prepared in the presence of PVP of different molecular weights. The molecular weight of PVP also affected the electrochemical properties of the Co3O4 nanosphere/Co(OH)2 nanosheet composites. When using PVP of moderate chain length (58k), the resultant Co3O4/Co(OH)2 composite exhibited the optimal supercapacitive performance, characterized by an excellent specific capacitance of 771.2 F g−1 at 1 A g−1, and retained approximately 68.5% of this capacitance when operated at a high current density of 10 A g−1. Furthermore, this composite displayed an excellent charge/discharge cycling life at a current density of 4 A g−1, with a capacitance retention of 93.3% after 3000 repeated cycles.",

keywords = "Co(OH), CoO, Microwave hydrothermal, PVP, Supercapacitor, Co(OH)2, Co3O4",

author = "Cho, {Er Chieh} and Chang-Jian, {Cai Wan} and Huang, {Jen Hsien} and Chou, {Jia An} and Syu, {Wei Lin} and Chen, {Ying Lin} and Lee, {Kuen Chan} and Hsiao, {Yu Sheng}",

note = "Publisher Copyright: {\textcopyright} 2020 Taiwan Institute of Chemical Engineers",

year = "2020",

month = may,

doi = "10.1016/j.jtice.2020.03.006",

language = "English",

volume = "110",

pages = "163--172",

journal = "Journal of the Taiwan Institute of Chemical Engineers",

issn = "1876-1070",

publisher = "Taiwan Institute of Chemical Engineers",

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T1 - Phase and morphology control in the synthesis of Co3O4 nanosphere/α-Co(OH)2 nanosheet hybrids for application in supercapacitors

AU - Cho, Er Chieh

AU - Chang-Jian, Cai Wan

AU - Huang, Jen Hsien

AU - Chou, Jia An

AU - Syu, Wei Lin

AU - Chen, Ying Lin

AU - Lee, Kuen Chan

AU - Hsiao, Yu Sheng

PY - 2020/5

Y1 - 2020/5

N2 - In this study, we developed a facile chemical precipitation approach for the synthesis of heterogeneous Co3O4 nanosphere/Co(OH)2 nanosheet hybrids in the presence of polyvinylpyrrolidone (PVP) as a phase-controlling reagent. The crystalline phase and morphology of the product varied upon changing the chain length of PVP (from 8k to 120k), with short-chain PVP favoring the formation of Co3O4 nanospheres and long-chain PVP favoring the synthesis of Co(OH)2 nanosheets. Accordingly, heterogeneous Co3O4/Co(OH)2 hybrids of various blending ratios were readily prepared in the presence of PVP of different molecular weights. The molecular weight of PVP also affected the electrochemical properties of the Co3O4 nanosphere/Co(OH)2 nanosheet composites. When using PVP of moderate chain length (58k), the resultant Co3O4/Co(OH)2 composite exhibited the optimal supercapacitive performance, characterized by an excellent specific capacitance of 771.2 F g−1 at 1 A g−1, and retained approximately 68.5% of this capacitance when operated at a high current density of 10 A g−1. Furthermore, this composite displayed an excellent charge/discharge cycling life at a current density of 4 A g−1, with a capacitance retention of 93.3% after 3000 repeated cycles.

AB - In this study, we developed a facile chemical precipitation approach for the synthesis of heterogeneous Co3O4 nanosphere/Co(OH)2 nanosheet hybrids in the presence of polyvinylpyrrolidone (PVP) as a phase-controlling reagent. The crystalline phase and morphology of the product varied upon changing the chain length of PVP (from 8k to 120k), with short-chain PVP favoring the formation of Co3O4 nanospheres and long-chain PVP favoring the synthesis of Co(OH)2 nanosheets. Accordingly, heterogeneous Co3O4/Co(OH)2 hybrids of various blending ratios were readily prepared in the presence of PVP of different molecular weights. The molecular weight of PVP also affected the electrochemical properties of the Co3O4 nanosphere/Co(OH)2 nanosheet composites. When using PVP of moderate chain length (58k), the resultant Co3O4/Co(OH)2 composite exhibited the optimal supercapacitive performance, characterized by an excellent specific capacitance of 771.2 F g−1 at 1 A g−1, and retained approximately 68.5% of this capacitance when operated at a high current density of 10 A g−1. Furthermore, this composite displayed an excellent charge/discharge cycling life at a current density of 4 A g−1, with a capacitance retention of 93.3% after 3000 repeated cycles.

KW - Co(OH)

KW - CoO

KW - Microwave hydrothermal

KW - PVP

KW - Supercapacitor

KW - Co(OH)2

KW - Co3O4

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