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Self-assembly formation of hollow Ni-Fe-O nanocage architectures by metal-organic frameworks with high-performance lithium storage.

Guo H, Li T, Chen W, Liu L, Qiao J, Zhang J - Sci Rep (2015)

Bottom Line: The stable cyclic performance is obtained for all rates from 1 C to 10 C.Even when the current reaches 10 C, the capacity can also arrive at 652 mAhg(-1).Subsequently, a specific capacity of ca. 975 mAhg(-1) is recovered when the current rate reduces back to 1 C after 200 cycles.

View Article: PubMed Central - PubMed

Affiliation: School of Chemistry Science and Engineering, Yunnan University, Kunming 650091,Yunnan, China.

ABSTRACT
A hollow hybrid Ni-Fe-O nanomaterial (NiFe2O4) is synthesized using a precursor of metal-organic frameworks through a simple and cost-effective method. The unique hollow nanocage structures shorten the length of Li-ion diffusion. The hollow structure offers a sufficient void space, which sufficiently alleviates the mechanical stress caused by volume change. Besides, the hybrid elements allow the volume change to take place in a stepwise manner during electrochemical cycle. And thus, the hierarchical hollow NiFe2O4 nanocage electrode exhibits extraordinary electrochemical performance. The stable cyclic performance is obtained for all rates from 1 C to 10 C. Even when the current reaches 10 C, the capacity can also arrive at 652 mAhg(-1). Subsequently, a specific capacity of ca. 975 mAhg(-1) is recovered when the current rate reduces back to 1 C after 200 cycles. This strategy that derived from NMOFs may shed light on a new route for large-scale synthesis of hollow porous hybrid nanocages for energy storage, environmental remediation and other novel applications.

No MeSH data available.


N2 adsorption/desorption isotherm (77 K) curve for hollow NiFe2O4 nanocages (350 °C).Inset: The pore-size distribution of the samples.
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f5: N2 adsorption/desorption isotherm (77 K) curve for hollow NiFe2O4 nanocages (350 °C).Inset: The pore-size distribution of the samples.

Mentions: The N2 adsorption/desorption isotherms and the pore size distribution of obtained hollow porous NiFe2O4 nanocages from NMOFs are shown in Fig. 5. The isotherms are typical Type IV, which are the characteristic isotherm of mesoporous materials. The pore size distribution data indicates that the pore diameter distribution is in the range of 3–8 nm. The BET surface area of the sample is 260.9 m2 g−1. It can be seen that the specific surface area of NiFe2O4 is significantly higher than most of the previous reported TMOs microsphere products242526. The single-point total volume of pores at P/P0 = 0.975 is 0.438 cm3 g−1. These data indicate that the prepared samples have a loose mesoporous structure. This structure is believed to have beneficial effect on buffering the volume changes of hollow porous NiFe2O4 nanocage electrodes during electrochemical reaction.


Self-assembly formation of hollow Ni-Fe-O nanocage architectures by metal-organic frameworks with high-performance lithium storage.

Guo H, Li T, Chen W, Liu L, Qiao J, Zhang J - Sci Rep (2015)

N2 adsorption/desorption isotherm (77 K) curve for hollow NiFe2O4 nanocages (350 °C).Inset: The pore-size distribution of the samples.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4562299&req=5

f5: N2 adsorption/desorption isotherm (77 K) curve for hollow NiFe2O4 nanocages (350 °C).Inset: The pore-size distribution of the samples.
Mentions: The N2 adsorption/desorption isotherms and the pore size distribution of obtained hollow porous NiFe2O4 nanocages from NMOFs are shown in Fig. 5. The isotherms are typical Type IV, which are the characteristic isotherm of mesoporous materials. The pore size distribution data indicates that the pore diameter distribution is in the range of 3–8 nm. The BET surface area of the sample is 260.9 m2 g−1. It can be seen that the specific surface area of NiFe2O4 is significantly higher than most of the previous reported TMOs microsphere products242526. The single-point total volume of pores at P/P0 = 0.975 is 0.438 cm3 g−1. These data indicate that the prepared samples have a loose mesoporous structure. This structure is believed to have beneficial effect on buffering the volume changes of hollow porous NiFe2O4 nanocage electrodes during electrochemical reaction.

Bottom Line: The stable cyclic performance is obtained for all rates from 1 C to 10 C.Even when the current reaches 10 C, the capacity can also arrive at 652 mAhg(-1).Subsequently, a specific capacity of ca. 975 mAhg(-1) is recovered when the current rate reduces back to 1 C after 200 cycles.

View Article: PubMed Central - PubMed

Affiliation: School of Chemistry Science and Engineering, Yunnan University, Kunming 650091,Yunnan, China.

ABSTRACT
A hollow hybrid Ni-Fe-O nanomaterial (NiFe2O4) is synthesized using a precursor of metal-organic frameworks through a simple and cost-effective method. The unique hollow nanocage structures shorten the length of Li-ion diffusion. The hollow structure offers a sufficient void space, which sufficiently alleviates the mechanical stress caused by volume change. Besides, the hybrid elements allow the volume change to take place in a stepwise manner during electrochemical cycle. And thus, the hierarchical hollow NiFe2O4 nanocage electrode exhibits extraordinary electrochemical performance. The stable cyclic performance is obtained for all rates from 1 C to 10 C. Even when the current reaches 10 C, the capacity can also arrive at 652 mAhg(-1). Subsequently, a specific capacity of ca. 975 mAhg(-1) is recovered when the current rate reduces back to 1 C after 200 cycles. This strategy that derived from NMOFs may shed light on a new route for large-scale synthesis of hollow porous hybrid nanocages for energy storage, environmental remediation and other novel applications.

No MeSH data available.