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Electrochemical performance of NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire anodes for lithium-ion batteries.

Park KS, Seo SD, Shim HW, Kim DW - Nanoscale Res Lett (2012)

Bottom Line: NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire electrodes for lithium-ion rechargeable batteries have been synthesized via a hydrothermal method, followed by thermal post-annealing at 500°C for 2 h.The reversible capacity of NiMoO4 and Ni0.75Co0.25MoO4 nanowire electrodes was larger (≈520 mA h/g after 20 cycles at a rate of 196 mA/g) than that of the other nanowires.This enhanced electrochemical performance of NixCo1-xMoO4 nanowires with high Ni content was ascribed to their larger surface area and efficient electron transport path facilitated by their one-dimensional nanostructure.

View Article: PubMed Central - HTML - PubMed

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

ABSTRACT
NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire electrodes for lithium-ion rechargeable batteries have been synthesized via a hydrothermal method, followed by thermal post-annealing at 500°C for 2 h. The chemical composition of the nanowires was varied, and their morphological features and crystalline structures were characterized using field-emission scanning electron microscopy and X-ray powder diffraction. The reversible capacity of NiMoO4 and Ni0.75Co0.25MoO4 nanowire electrodes was larger (≈520 mA h/g after 20 cycles at a rate of 196 mA/g) than that of the other nanowires. This enhanced electrochemical performance of NixCo1-xMoO4 nanowires with high Ni content was ascribed to their larger surface area and efficient electron transport path facilitated by their one-dimensional nanostructure.

No MeSH data available.


Related in: MedlinePlus

Morphologies and crystal structures of NixCo1-xMoO4 nanowires. (a-e) FE-SEM images of NixCo1-xMoO4 nanowires with various x values and (f) their corresponding X-ray diffraction patterns. Filled circle, empty circle, filled inverted triangle, and empty inverted triangle correspond to α-CoMoO4, β-CoMoO4, α-NiMoO4, and β-NiMoO4, respectively (by KS Park et al.).
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Figure 3: Morphologies and crystal structures of NixCo1-xMoO4 nanowires. (a-e) FE-SEM images of NixCo1-xMoO4 nanowires with various x values and (f) their corresponding X-ray diffraction patterns. Filled circle, empty circle, filled inverted triangle, and empty inverted triangle correspond to α-CoMoO4, β-CoMoO4, α-NiMoO4, and β-NiMoO4, respectively (by KS Park et al.).

Mentions: Figures 3a to 3e show FE-SEM images of NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowires obtained by post-annealing the NixCo1-xMoO4·nH2O nanowire precursors at 500°C for 2 h. All post-annealed samples maintained their pristine nanowire morphologies. Although a marked change in the diameter or length of the nanowires after post-annealing was not observed, they seemed to be agglomerated slightly and were forming bundles, which could lead to a decrease in their surface area. In order to confirm the change in surface area that may have occurred during post-annealing of NixCo1-xMoO4·nH2O nanowire precursors, the Brunauer-Emmett-Teller [BET] (Belsorp-mini, BEL Japan Inc., Osaka, Japan) technique was carried out at liquid nitrogen temperature. From the results presented in Table 1 it can be confirmed that the surface areas of NixCo1-xMoO4 nanowires in all compositions were slightly decreased compared with those of the corresponding NixCo1-xMoO4·nH2O nanowires. This was ascribed to the aggregation and growth of the nanowires. Furthermore, it was found that the surface areas of the nanowires gradually increased with increasing Ni concentration because of the corresponding decrease in their diameter and length.


Electrochemical performance of NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire anodes for lithium-ion batteries.

Park KS, Seo SD, Shim HW, Kim DW - Nanoscale Res Lett (2012)

Morphologies and crystal structures of NixCo1-xMoO4 nanowires. (a-e) FE-SEM images of NixCo1-xMoO4 nanowires with various x values and (f) their corresponding X-ray diffraction patterns. Filled circle, empty circle, filled inverted triangle, and empty inverted triangle correspond to α-CoMoO4, β-CoMoO4, α-NiMoO4, and β-NiMoO4, respectively (by KS Park et al.).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3278371&req=5

Figure 3: Morphologies and crystal structures of NixCo1-xMoO4 nanowires. (a-e) FE-SEM images of NixCo1-xMoO4 nanowires with various x values and (f) their corresponding X-ray diffraction patterns. Filled circle, empty circle, filled inverted triangle, and empty inverted triangle correspond to α-CoMoO4, β-CoMoO4, α-NiMoO4, and β-NiMoO4, respectively (by KS Park et al.).
Mentions: Figures 3a to 3e show FE-SEM images of NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowires obtained by post-annealing the NixCo1-xMoO4·nH2O nanowire precursors at 500°C for 2 h. All post-annealed samples maintained their pristine nanowire morphologies. Although a marked change in the diameter or length of the nanowires after post-annealing was not observed, they seemed to be agglomerated slightly and were forming bundles, which could lead to a decrease in their surface area. In order to confirm the change in surface area that may have occurred during post-annealing of NixCo1-xMoO4·nH2O nanowire precursors, the Brunauer-Emmett-Teller [BET] (Belsorp-mini, BEL Japan Inc., Osaka, Japan) technique was carried out at liquid nitrogen temperature. From the results presented in Table 1 it can be confirmed that the surface areas of NixCo1-xMoO4 nanowires in all compositions were slightly decreased compared with those of the corresponding NixCo1-xMoO4·nH2O nanowires. This was ascribed to the aggregation and growth of the nanowires. Furthermore, it was found that the surface areas of the nanowires gradually increased with increasing Ni concentration because of the corresponding decrease in their diameter and length.

Bottom Line: NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire electrodes for lithium-ion rechargeable batteries have been synthesized via a hydrothermal method, followed by thermal post-annealing at 500°C for 2 h.The reversible capacity of NiMoO4 and Ni0.75Co0.25MoO4 nanowire electrodes was larger (≈520 mA h/g after 20 cycles at a rate of 196 mA/g) than that of the other nanowires.This enhanced electrochemical performance of NixCo1-xMoO4 nanowires with high Ni content was ascribed to their larger surface area and efficient electron transport path facilitated by their one-dimensional nanostructure.

View Article: PubMed Central - HTML - PubMed

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

ABSTRACT
NixCo1-xMoO4 (0 ≤ x ≤ 1) nanowire electrodes for lithium-ion rechargeable batteries have been synthesized via a hydrothermal method, followed by thermal post-annealing at 500°C for 2 h. The chemical composition of the nanowires was varied, and their morphological features and crystalline structures were characterized using field-emission scanning electron microscopy and X-ray powder diffraction. The reversible capacity of NiMoO4 and Ni0.75Co0.25MoO4 nanowire electrodes was larger (≈520 mA h/g after 20 cycles at a rate of 196 mA/g) than that of the other nanowires. This enhanced electrochemical performance of NixCo1-xMoO4 nanowires with high Ni content was ascribed to their larger surface area and efficient electron transport path facilitated by their one-dimensional nanostructure.

No MeSH data available.


Related in: MedlinePlus