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Low-temperature synthesis of CuO-interlaced nanodiscs for lithium ion battery electrodes.

Seo SD, Jin YH, Lee SH, Shim HW, Kim DW - Nanoscale Res Lett (2011)

Bottom Line: After further prolonged reaction times, secondary irregular nanodiscs gradually grew vertically into regular nanodiscs.The electrochemical performances of the CuO nanodisc electrodes were evaluated in detail using cyclic voltammetry and galvanostatic cycling.Furthermore, we demonstrate that the incorporation of multiwalled carbon nanotubes enables the enhanced reversible capacities and capacity retention of CuO nanodisc electrodes on cycling by offering more efficient electron transport paths.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, Ajou University, Suwon 443-749, Korea. dwkim@ajou.ac.kr.

ABSTRACT
In this study, we report the high-yield synthesis of 2-dimensional cupric oxide (CuO) nanodiscs through dehydrogenation of 1-dimensional Cu(OH)2 nanowires at 60°C. Most of the nanodiscs had a diameter of approximately 500 nm and a thickness of approximately 50 nm. After further prolonged reaction times, secondary irregular nanodiscs gradually grew vertically into regular nanodiscs. These CuO nanostructures were characterized using X-ray diffraction, transmission electron microscopy, and Brunauer-Emmett-Teller measurements. The possible growth mechanism of the interlaced disc CuO nanostructures is systematically discussed. The electrochemical performances of the CuO nanodisc electrodes were evaluated in detail using cyclic voltammetry and galvanostatic cycling. Furthermore, we demonstrate that the incorporation of multiwalled carbon nanotubes enables the enhanced reversible capacities and capacity retention of CuO nanodisc electrodes on cycling by offering more efficient electron transport paths.

No MeSH data available.


Charge-discharge behavior of CuO/MWCNT composite electrodes. Galvanostatic discharge/charge voltage profiles of CuO/MWCNT composite nanostructures at a rate of C/5. Inset shows the comparison of specific capacities in pure CuO and CuO/MWCNT composite nanostructures.
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Figure 6: Charge-discharge behavior of CuO/MWCNT composite electrodes. Galvanostatic discharge/charge voltage profiles of CuO/MWCNT composite nanostructures at a rate of C/5. Inset shows the comparison of specific capacities in pure CuO and CuO/MWCNT composite nanostructures.

Mentions: Figure 6 represents the charge-discharge behavior of CuO/MWCNT composite electrodes at a rate of C/5. The first discharge and charge capacities were 1,025 and 657 mA h g-1, respectively, and a high reversible capacity of approximately 440 mA h g-1 obtained after 20 cycles. These CuO/MWCNT composite nanostructures exhibited a higher reversible lithium storage capacity and better capacity retention than the pure CuO nanodiscs (Figure 3). The specific capacity of the CuO/MWCNT composites was estimated to be 47% greater than that of pure CuO nanodiscs. This additional lithium storage capacity in the CuO/MWCNT composites may result from the efficient electron transport by the incorporation of MWCNT in high surface area CuO nanostructures. Therefore, other surface modifications using carbon or conductive metals could possibly further improve electrochemical performance of these CuO nanostructures.


Low-temperature synthesis of CuO-interlaced nanodiscs for lithium ion battery electrodes.

Seo SD, Jin YH, Lee SH, Shim HW, Kim DW - Nanoscale Res Lett (2011)

Charge-discharge behavior of CuO/MWCNT composite electrodes. Galvanostatic discharge/charge voltage profiles of CuO/MWCNT composite nanostructures at a rate of C/5. Inset shows the comparison of specific capacities in pure CuO and CuO/MWCNT composite nanostructures.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211491&req=5

Figure 6: Charge-discharge behavior of CuO/MWCNT composite electrodes. Galvanostatic discharge/charge voltage profiles of CuO/MWCNT composite nanostructures at a rate of C/5. Inset shows the comparison of specific capacities in pure CuO and CuO/MWCNT composite nanostructures.
Mentions: Figure 6 represents the charge-discharge behavior of CuO/MWCNT composite electrodes at a rate of C/5. The first discharge and charge capacities were 1,025 and 657 mA h g-1, respectively, and a high reversible capacity of approximately 440 mA h g-1 obtained after 20 cycles. These CuO/MWCNT composite nanostructures exhibited a higher reversible lithium storage capacity and better capacity retention than the pure CuO nanodiscs (Figure 3). The specific capacity of the CuO/MWCNT composites was estimated to be 47% greater than that of pure CuO nanodiscs. This additional lithium storage capacity in the CuO/MWCNT composites may result from the efficient electron transport by the incorporation of MWCNT in high surface area CuO nanostructures. Therefore, other surface modifications using carbon or conductive metals could possibly further improve electrochemical performance of these CuO nanostructures.

Bottom Line: After further prolonged reaction times, secondary irregular nanodiscs gradually grew vertically into regular nanodiscs.The electrochemical performances of the CuO nanodisc electrodes were evaluated in detail using cyclic voltammetry and galvanostatic cycling.Furthermore, we demonstrate that the incorporation of multiwalled carbon nanotubes enables the enhanced reversible capacities and capacity retention of CuO nanodisc electrodes on cycling by offering more efficient electron transport paths.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, Ajou University, Suwon 443-749, Korea. dwkim@ajou.ac.kr.

ABSTRACT
In this study, we report the high-yield synthesis of 2-dimensional cupric oxide (CuO) nanodiscs through dehydrogenation of 1-dimensional Cu(OH)2 nanowires at 60°C. Most of the nanodiscs had a diameter of approximately 500 nm and a thickness of approximately 50 nm. After further prolonged reaction times, secondary irregular nanodiscs gradually grew vertically into regular nanodiscs. These CuO nanostructures were characterized using X-ray diffraction, transmission electron microscopy, and Brunauer-Emmett-Teller measurements. The possible growth mechanism of the interlaced disc CuO nanostructures is systematically discussed. The electrochemical performances of the CuO nanodisc electrodes were evaluated in detail using cyclic voltammetry and galvanostatic cycling. Furthermore, we demonstrate that the incorporation of multiwalled carbon nanotubes enables the enhanced reversible capacities and capacity retention of CuO nanodisc electrodes on cycling by offering more efficient electron transport paths.

No MeSH data available.