Enhanced electrochemical performance of lamellar structured Co-Ni(OH)2/reduced graphene oxide (rGO) via hydrothermal synthesis

Sintayehu Nibret Tiruneh; Bong Kyun Kang; Quang Tran Ngoc; Dae Ho Yoon

doi:10.1039/c5ra23724f

Enhanced electrochemical performance of lamellar structured Co-Ni(OH)₂/reduced graphene oxide (rGO) via hydrothermal synthesis

Sintayehu Nibret Tiruneh, Bong Kyun Kang, Quang Tran Ngoc, Dae Ho Yoon

Department of Advanced Materials Science and Engineering

Sungkyunkwan University

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

19 Scopus citations

Abstract

Lamellar Co-Ni(OH)₂/rGO structures were prepared by co-precipitation followed by hydrothermal synthesis. Lamellar and crystalline Co-Ni(OH)₂/rGO delivered better specific capacitance (C_s) and rate capability than low-crystallinity composites due to improved ionic and electronic conductivity. A high value of the C_s was achieved with Co-Ni(OH)₂/rGO prepared at 150 °C for 12 h with a graphite oxide (GO)-to-metal precursor ratio of 1:5. This condition gave a C_s of 617 F g^-1 at 2 mV s^-1 and 811 F g^-1 at 0.5 A g^-1 with the highest capacitance retention of 90% at 2 A g^-1 and good cycling stability (∼77% at 70 mV s^-1) at 5000 cycles. Furthermore, high mass loading, ∼4.5-5.5 mg cm^-2, was used in the fabrication of the electrodes, which is higher than that of most previous reports.

Original language	English
Pages (from-to)	4764-4769
Number of pages	6
Journal	RSC Advances
Volume	6
Issue number	6
DOIs	https://doi.org/10.1039/c5ra23724f
State	Published - 2016

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title = "Enhanced electrochemical performance of lamellar structured Co-Ni(OH)2/reduced graphene oxide (rGO) via hydrothermal synthesis",

abstract = "Lamellar Co-Ni(OH)2/rGO structures were prepared by co-precipitation followed by hydrothermal synthesis. Lamellar and crystalline Co-Ni(OH)2/rGO delivered better specific capacitance (Cs) and rate capability than low-crystallinity composites due to improved ionic and electronic conductivity. A high value of the Cs was achieved with Co-Ni(OH)2/rGO prepared at 150 °C for 12 h with a graphite oxide (GO)-to-metal precursor ratio of 1:5. This condition gave a Cs of 617 F g-1 at 2 mV s-1 and 811 F g-1 at 0.5 A g-1 with the highest capacitance retention of 90\% at 2 A g-1 and good cycling stability (∼77\% at 70 mV s-1) at 5000 cycles. Furthermore, high mass loading, ∼4.5-5.5 mg cm-2, was used in the fabrication of the electrodes, which is higher than that of most previous reports.",

author = "Tiruneh, \{Sintayehu Nibret\} and Kang, \{Bong Kyun\} and Ngoc, \{Quang Tran\} and Yoon, \{Dae Ho\}",

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year = "2016",

doi = "10.1039/c5ra23724f",

language = "English",

volume = "6",

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T1 - Enhanced electrochemical performance of lamellar structured Co-Ni(OH)2/reduced graphene oxide (rGO) via hydrothermal synthesis

AU - Tiruneh, Sintayehu Nibret

AU - Kang, Bong Kyun

AU - Ngoc, Quang Tran

AU - Yoon, Dae Ho

N1 - Publisher Copyright: © The Royal Society of Chemistry 2016.

PY - 2016

Y1 - 2016

N2 - Lamellar Co-Ni(OH)2/rGO structures were prepared by co-precipitation followed by hydrothermal synthesis. Lamellar and crystalline Co-Ni(OH)2/rGO delivered better specific capacitance (Cs) and rate capability than low-crystallinity composites due to improved ionic and electronic conductivity. A high value of the Cs was achieved with Co-Ni(OH)2/rGO prepared at 150 °C for 12 h with a graphite oxide (GO)-to-metal precursor ratio of 1:5. This condition gave a Cs of 617 F g-1 at 2 mV s-1 and 811 F g-1 at 0.5 A g-1 with the highest capacitance retention of 90% at 2 A g-1 and good cycling stability (∼77% at 70 mV s-1) at 5000 cycles. Furthermore, high mass loading, ∼4.5-5.5 mg cm-2, was used in the fabrication of the electrodes, which is higher than that of most previous reports.

AB - Lamellar Co-Ni(OH)2/rGO structures were prepared by co-precipitation followed by hydrothermal synthesis. Lamellar and crystalline Co-Ni(OH)2/rGO delivered better specific capacitance (Cs) and rate capability than low-crystallinity composites due to improved ionic and electronic conductivity. A high value of the Cs was achieved with Co-Ni(OH)2/rGO prepared at 150 °C for 12 h with a graphite oxide (GO)-to-metal precursor ratio of 1:5. This condition gave a Cs of 617 F g-1 at 2 mV s-1 and 811 F g-1 at 0.5 A g-1 with the highest capacitance retention of 90% at 2 A g-1 and good cycling stability (∼77% at 70 mV s-1) at 5000 cycles. Furthermore, high mass loading, ∼4.5-5.5 mg cm-2, was used in the fabrication of the electrodes, which is higher than that of most previous reports.

UR - https://www.scopus.com/pages/publications/84955311888

U2 - 10.1039/c5ra23724f

DO - 10.1039/c5ra23724f

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SN - 2046-2069

VL - 6

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EP - 4769

JO - RSC Advances

JF - RSC Advances

IS - 6

ER -

Enhanced electrochemical performance of lamellar structured Co-Ni(OH)₂/reduced graphene oxide (rGO) via hydrothermal synthesis

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