Journal
APPLIED SURFACE SCIENCE
Volume 495, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.143590
Keywords
Carbon-coated alpha-Fe2O3@Fe3O4; Heterostructured; Synergistic effect; Lithium ion batteries
Categories
Funding
- National Natural Science Foundation of China [51674068, 51771046, 51774002, 51874079, 51871046, 51704064, 51804035]
- Natural Science Foundation of Hebei Province [E2018501091]
- Science and Technology Project of Hebei Province [15271302D]
- Training Foundation for Scientific Research of Talents Project, Hebei Province [A2016005004]
- Hebei Province higher education science and technology research project [QN2017103]
- Fundamental Research Funds for the Central Universities [N172302001, N172304044]
- Qinhuangdao City University student of Science and Technology Innovation and Entrepreneurship Project [PZB1810008T-46]
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In this study, carbon-coated alpha-Fe2O3@Fe3O4 heterostructures were designed and synthesized by a simple ballmilling and an auxiliary rheological phase method combined with carbothermal reduction. Due to the synergistic effect between alpha-Fe2O3 and Fe3O4, the carbon-coated alpha-Fe2O3@Fe3O4 heterostructures have an excellent electrochemical performance. In order to elucidate the reaction process, the types of gases produced during the pyrolysis of citric acid are preliminarily examined, and the possible chemical reactions are deduced from the experimental results. The Mossbauer spectrum is used to determine the relative ratio of alpha-Fe2O3@Fe3O4. As an anode material for lithium ion batteries, a carbon-coated Fe2O3@Fe3O4 electrode exhibits a high initial discharge/charge capacity of 1462.2/968.2 mAh g(-1) and a good reversible capacity (971.5 mAh g(-1) ) at a current density of 0.1 A g(-1). Moreover, even after 200 cycles, a reversible capacity of 711.0 mAh g(-1) can be maintained at a current density of 0.5 A g(-1).
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