期刊
CHEMICAL ENGINEERING JOURNAL
卷 354, 期 -, 页码 672-679出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.08.089
关键词
Electrochemical deposition; Iron oxide; Morphology engineering; High performance; Ni/Fe battery
资金
- National Natural Science Foundation of China, China [21673035]
- Hundred Abroad Talents Plan of Northeastern University, China
- Fundamental Research Funds for the Central Universities, China [N170503008]
- China Postdoctoral Science Foundation, China [2018M630294]
Aqueous rechargeable Ni/Fe batteries possess potential advantages for large-scale energy storage applications due to their low cost, high safety and fast ion diffusions in electrolyte. However, the electrochemical performance of the iron-based anode is still far from ideal due to particle aggregations. Herein, we carry out the morphology engineering on the iron oxide active materials via a facile electrochemical method to improve its charge storage capability. The morphology transition from zero-dimensional particles to one-dimensional nanorods is realized by tuning the electrolyte composition, while subsequent annealing treatment results in further morphology modification into 3D interconnected nanoparticles (10-20 nm). The hierarchical structure allows facile ion and electron transfers, and the large surface provides various active sites for the charge storage conversion reaction. As a result, even at the high current density of 2 Ag-1 (similar to 6C rate), the iron oxide electrode can still deliver a high specific capacity of 184 mAh g(-1). At the same time, the morphology integrity and stability of the electrode leads to a good cycle life, with 87.5% capacity retained upon 5000 cycles. The Ni/Fe full cell assembled with the iron oxide anode and a Ni-Co double hydroxide cathode exhibits a good energy density of 82.3 Wh kg(-1) at the power density of 3.3 kW kg(-1). Our fundamental study would provide new insights for the electro-deposition of iron-based materials and endow new opportunities for the fabrication of high-performance iron-based electrodes for energy storage systems.
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