Issue 14, 2011

Structural evolution from mesoporous α-Fe2O3 to Fe3O4@C and γ-Fe2O3 nanospheres and their lithium storage performances

Abstract

Mesoporous α-Fe2O3 nanospheres were synthesized through a solvothermal route, with polyethylene glycol as soft templates. The mesoporous nanospheres were then coated with carbon through hydrothermal treatment of glucose. After being calcined at 500 °C under Ar atmosphere for 4 h, mesoporous Fe3O4@C nanospheres were obtained. When further heated at 260 °C in air for 2 h, Fe3O4@C was transformed into γ-Fe2O3 mesoporous nanospheres. Significant phase changes occurred without destroying the structure of mesoporous nanospheres. All the three mesoporous nanospheres showed superior Li storage performances at the initial charge and discharge cycle; however, the cyclic stabilities of the three samples were quite different; Fe3O4@C exhibited a stable discharge capacity of ∼570 mA h g−1 after 30 cycles, while the discharge capacities of α-Fe2O3 and γ-Fe2O3 faded rapidly to ∼100 mA h g−1 after 30 cycles.

Graphical abstract: Structural evolution from mesoporous α-Fe2O3 to Fe3O4@C and γ-Fe2O3 nanospheres and their lithium storage performances

Supplementary files

Article information

Article type
Paper
Submitted
29 Nov 2010
Accepted
19 Apr 2011
First published
24 May 2011

CrystEngComm, 2011,13, 4709-4713

Structural evolution from mesoporous α-Fe2O3 to Fe3O4@C and γ-Fe2O3 nanospheres and their lithium storage performances

S. Yuan, Z. Zhou and G. Li, CrystEngComm, 2011, 13, 4709 DOI: 10.1039/C0CE00902D

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