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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.


XRD pattern of the CuO/MWCNT composites. (a) XRD pattern of the CuO/MWCNT composite nanostructures. (b) TGA of pure CuO and CuO/MWCNT composite nanostructures. (c-d) Typical FESEM images of the CuO/MWCNT composite nanostructures.
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Figure 4: XRD pattern of the CuO/MWCNT composites. (a) XRD pattern of the CuO/MWCNT composite nanostructures. (b) TGA of pure CuO and CuO/MWCNT composite nanostructures. (c-d) Typical FESEM images of the CuO/MWCNT composite nanostructures.

Mentions: Formation of composites by incorporation of MWCNTs can provide an enhanced electronic conductivity of electrodes and elastic buffers for releasing the strain of CuO during the Li conversion reaction [28]. Figure 4a shows the XRD pattern of the CuO/MWCNT composites. Compared to the XRD pattern of pure CuO-interlaced nanodiscs (Figure 1a), that of the CuO/MWCNT composites showed an additional peak at 25° by the MWCNT phase. From a comparison of the weight loss between pure CuO and CuO/MWCNT composites using a thermogravimetric analyzer (TGA), the incorporated amount of MWCNT in the composites corresponded to approximately 13%, as shown in Figure 4b.


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)

XRD pattern of the CuO/MWCNT composites. (a) XRD pattern of the CuO/MWCNT composite nanostructures. (b) TGA of pure CuO and CuO/MWCNT composite nanostructures. (c-d) Typical FESEM images of the CuO/MWCNT composite nanostructures.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC3211491&req=5

Figure 4: XRD pattern of the CuO/MWCNT composites. (a) XRD pattern of the CuO/MWCNT composite nanostructures. (b) TGA of pure CuO and CuO/MWCNT composite nanostructures. (c-d) Typical FESEM images of the CuO/MWCNT composite nanostructures.
Mentions: Formation of composites by incorporation of MWCNTs can provide an enhanced electronic conductivity of electrodes and elastic buffers for releasing the strain of CuO during the Li conversion reaction [28]. Figure 4a shows the XRD pattern of the CuO/MWCNT composites. Compared to the XRD pattern of pure CuO-interlaced nanodiscs (Figure 1a), that of the CuO/MWCNT composites showed an additional peak at 25° by the MWCNT phase. From a comparison of the weight loss between pure CuO and CuO/MWCNT composites using a thermogravimetric analyzer (TGA), the incorporated amount of MWCNT in the composites corresponded to approximately 13%, as shown in Figure 4b.

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.