Superior electrochemical performances of double-shelled CuO yolk-shell powders formed from spherical copper nitrate-polyvinylpyrrolidone composite powders

Young Jun Hong, Yun Chan Kang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Spherical copper nitrate-polyvinylpyrrolidone (PVP) composite powders coated with a copper nitrate hydroxide [Cu2(OH)3NO3]-carbon composite are prepared by a one-pot spray pyrolysis process. In this, Cu2(OH)3NO3 and carbon are formed by dehydration of copper nitrate and carbonization of PVP, respectively. Thermal decomposition of the composite powders is then performed at 300 °C under an air atmosphere, producing the final yolk-shell-structured CuO powders. The electrochemical properties of these powders are then compared with those of commercial CuO nanopowders. The discharge capacities of the CuO yolk-shell powders and the commercial CuO nanopowders after 240 cycles at a current density of 500 mA g-1 are 590 and 302 mA h g-1, respectively. Furthermore, the discharge capacity of the CuO yolk-shell powders is as high as 615 mA h g-1, even after 1000 cycles at a current density of 1000 mA g-1. Electrochemical impedance spectroscopy reveals that the structural stability of the CuO yolk-shell powders during cycling lowers the charge transfer resistance, and thereby improves the lithium ion diffusion rate.

Original languageEnglish
Pages (from-to)58231-58237
Number of pages7
JournalRSC Advances
Volume4
Issue number102
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Povidone
Nitrates
Powders
Copper
Composite materials
Current density
Carbon
Spray pyrolysis
Carbonization
Dehydration
Electrochemical impedance spectroscopy
Electrochemical properties
Lithium
Charge transfer
Pyrolysis
Ions
Air

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Superior electrochemical performances of double-shelled CuO yolk-shell powders formed from spherical copper nitrate-polyvinylpyrrolidone composite powders. / Hong, Young Jun; Kang, Yun Chan.

In: RSC Advances, Vol. 4, No. 102, 01.01.2014, p. 58231-58237.

Research output: Contribution to journalArticle

@article{8fc89fe36484461fb0569af10a714809,
title = "Superior electrochemical performances of double-shelled CuO yolk-shell powders formed from spherical copper nitrate-polyvinylpyrrolidone composite powders",
abstract = "Spherical copper nitrate-polyvinylpyrrolidone (PVP) composite powders coated with a copper nitrate hydroxide [Cu2(OH)3NO3]-carbon composite are prepared by a one-pot spray pyrolysis process. In this, Cu2(OH)3NO3 and carbon are formed by dehydration of copper nitrate and carbonization of PVP, respectively. Thermal decomposition of the composite powders is then performed at 300 °C under an air atmosphere, producing the final yolk-shell-structured CuO powders. The electrochemical properties of these powders are then compared with those of commercial CuO nanopowders. The discharge capacities of the CuO yolk-shell powders and the commercial CuO nanopowders after 240 cycles at a current density of 500 mA g-1 are 590 and 302 mA h g-1, respectively. Furthermore, the discharge capacity of the CuO yolk-shell powders is as high as 615 mA h g-1, even after 1000 cycles at a current density of 1000 mA g-1. Electrochemical impedance spectroscopy reveals that the structural stability of the CuO yolk-shell powders during cycling lowers the charge transfer resistance, and thereby improves the lithium ion diffusion rate.",
author = "Hong, {Young Jun} and Kang, {Yun Chan}",
year = "2014",
month = "1",
day = "1",
doi = "10.1039/c4ra06054g",
language = "English",
volume = "4",
pages = "58231--58237",
journal = "RSC Advances",
issn = "2046-2069",
publisher = "Royal Society of Chemistry",
number = "102",

}

TY - JOUR

T1 - Superior electrochemical performances of double-shelled CuO yolk-shell powders formed from spherical copper nitrate-polyvinylpyrrolidone composite powders

AU - Hong, Young Jun

AU - Kang, Yun Chan

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Spherical copper nitrate-polyvinylpyrrolidone (PVP) composite powders coated with a copper nitrate hydroxide [Cu2(OH)3NO3]-carbon composite are prepared by a one-pot spray pyrolysis process. In this, Cu2(OH)3NO3 and carbon are formed by dehydration of copper nitrate and carbonization of PVP, respectively. Thermal decomposition of the composite powders is then performed at 300 °C under an air atmosphere, producing the final yolk-shell-structured CuO powders. The electrochemical properties of these powders are then compared with those of commercial CuO nanopowders. The discharge capacities of the CuO yolk-shell powders and the commercial CuO nanopowders after 240 cycles at a current density of 500 mA g-1 are 590 and 302 mA h g-1, respectively. Furthermore, the discharge capacity of the CuO yolk-shell powders is as high as 615 mA h g-1, even after 1000 cycles at a current density of 1000 mA g-1. Electrochemical impedance spectroscopy reveals that the structural stability of the CuO yolk-shell powders during cycling lowers the charge transfer resistance, and thereby improves the lithium ion diffusion rate.

AB - Spherical copper nitrate-polyvinylpyrrolidone (PVP) composite powders coated with a copper nitrate hydroxide [Cu2(OH)3NO3]-carbon composite are prepared by a one-pot spray pyrolysis process. In this, Cu2(OH)3NO3 and carbon are formed by dehydration of copper nitrate and carbonization of PVP, respectively. Thermal decomposition of the composite powders is then performed at 300 °C under an air atmosphere, producing the final yolk-shell-structured CuO powders. The electrochemical properties of these powders are then compared with those of commercial CuO nanopowders. The discharge capacities of the CuO yolk-shell powders and the commercial CuO nanopowders after 240 cycles at a current density of 500 mA g-1 are 590 and 302 mA h g-1, respectively. Furthermore, the discharge capacity of the CuO yolk-shell powders is as high as 615 mA h g-1, even after 1000 cycles at a current density of 1000 mA g-1. Electrochemical impedance spectroscopy reveals that the structural stability of the CuO yolk-shell powders during cycling lowers the charge transfer resistance, and thereby improves the lithium ion diffusion rate.

UR - http://www.scopus.com/inward/record.url?scp=84911896527&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84911896527&partnerID=8YFLogxK

U2 - 10.1039/c4ra06054g

DO - 10.1039/c4ra06054g

M3 - Article

AN - SCOPUS:84911896527

VL - 4

SP - 58231

EP - 58237

JO - RSC Advances

JF - RSC Advances

SN - 2046-2069

IS - 102

ER -