期刊
ELECTROCHIMICA ACTA
卷 290, 期 -, 页码 332-338出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.09.066
关键词
Fe2O3; In-situ sulfurization; Carbon coating; PECVD; Ni-Fe batteries
资金
- National Natural Science Foundation of China [11547237, U1765105, 61604087]
The passivation issue of Fe2O3 electrode has triggered off their low practical capacity, poor rate capability and cycling performance and thus limited their practical application as anodes for alkaline Ni-Fe batteries. This paper proposes a dual modification of Fe2O3 by in-situ sulfurization and post carbon coating. Fe2O3-S nanorod arrays with a uniform sulfurization layer coated on Fe2O3 core were firstly fabricated by in-situ sulfurization of Fe2O3 nanorod arrays grown on Ti foil. After coating carbon on the Fe2O3-S arrays by PECVD process, Fe2O3-S@C were obtained. Electrochemical tests in alkaline electrolyte in the potential window of -1.2 similar to 0 V show that the Fe2O3-S@C exhibited dramatically improved discharge capacity (60.5 times compared to Fe2O3), cycling stability (92.2% for Fe2O3-S@C and only 7.9% for Fe2O3-S after 100 cycles) and excellent rate capability, owing to the co-contribution of the sulfurization layer and carbon layer. Furthermore, a Ni-Fe cell is assembled by pairing with a Ni2S3 cathode, and delivers high energy/power density (45.64 Wh/kg at 1.3 kW/kg and 27.14 Wh/kg at 10.3 kW/kg). (C) 2018 Elsevier Ltd. All rights reserved.
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