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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.


Representative illustration of the formation of hollow NiFe2O4 nanocages for MOFs. (This figure is drawn by T.T.L.).
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f1: Representative illustration of the formation of hollow NiFe2O4 nanocages for MOFs. (This figure is drawn by T.T.L.).

Mentions: In this work, a hybrid nanostructured NiFe2O4 with a hollow nanocage structure is synthesized to validate our proposed strategy in preparing hollow porous nanocages using NMOFs as a template (Fig. 1). The advantages in choosing such a Fe- and Ni- containing material is due to the low cost, non-toxicity and natural abundance of these two transition metal oxides as well as their high capacities when used as anode materials for LIBs2425262728. However, although the Ni and Fe oxides-based LIB electrodes can give high capacity, the pulverization of the electrode caused by huge volume change during the process of electrochemical reaction could lead to a rapid capacity degradation and poor cycling stability. When using a hybrid nanostructured NiFe2O4 prepared in this work, this issue could be significantly overcome, allowing the electrochemical reaction to proceed in a hybrid matrix of distinct material systems and resulting in an effective control of the electrode volume changes through facilitating the step-wise manner rather than at a certain fixed potential. Moreover, the coupling of these two metal species could render the NiFe2O4 with rich redox reactions and then improve electronic conductivity. As a result, the ternary NiFe2O4 prepared exhibits a higher electrical conductivity and an improved electrochemical activity when compared to binary metal oxides Fe2O3 and NiO224. Furthermore, this hollow nanocage structured NiFe2O4 could allow small-sized Lithium ion (Li+) to fast diffusion for reversible lithium ion storage, resulting in a good toleration to volume change during cycling121314. This paper reports the geometric configuration of hierarchical hollow NiFe2O4 nanocages synthesized using nano metal-organic frameworks and its associated high electrochemical performance when used as the anode materials for LIBs.


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)

Representative illustration of the formation of hollow NiFe2O4 nanocages for MOFs. (This figure is drawn by T.T.L.).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Representative illustration of the formation of hollow NiFe2O4 nanocages for MOFs. (This figure is drawn by T.T.L.).
Mentions: In this work, a hybrid nanostructured NiFe2O4 with a hollow nanocage structure is synthesized to validate our proposed strategy in preparing hollow porous nanocages using NMOFs as a template (Fig. 1). The advantages in choosing such a Fe- and Ni- containing material is due to the low cost, non-toxicity and natural abundance of these two transition metal oxides as well as their high capacities when used as anode materials for LIBs2425262728. However, although the Ni and Fe oxides-based LIB electrodes can give high capacity, the pulverization of the electrode caused by huge volume change during the process of electrochemical reaction could lead to a rapid capacity degradation and poor cycling stability. When using a hybrid nanostructured NiFe2O4 prepared in this work, this issue could be significantly overcome, allowing the electrochemical reaction to proceed in a hybrid matrix of distinct material systems and resulting in an effective control of the electrode volume changes through facilitating the step-wise manner rather than at a certain fixed potential. Moreover, the coupling of these two metal species could render the NiFe2O4 with rich redox reactions and then improve electronic conductivity. As a result, the ternary NiFe2O4 prepared exhibits a higher electrical conductivity and an improved electrochemical activity when compared to binary metal oxides Fe2O3 and NiO224. Furthermore, this hollow nanocage structured NiFe2O4 could allow small-sized Lithium ion (Li+) to fast diffusion for reversible lithium ion storage, resulting in a good toleration to volume change during cycling121314. This paper reports the geometric configuration of hierarchical hollow NiFe2O4 nanocages synthesized using nano metal-organic frameworks and its associated high electrochemical performance when used as the anode materials for LIBs.

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.