Anchoring mesoporous Fe3O4 nanospheres onto N-doped carbon nanotubes toward high-performance composite electrodes for supercapacitors |
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| Affiliation: | 1. Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China;2. College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China;3. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China;4. Zhongke Langfang Institute of Process Engineering, Fenghua Road No 1, Langfang Economic & Technical Development Zone, Hebei Province, 065001, China;1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, PR China;2. School of Materials and Chemical Engineering, Tongren University, Tongren, 554300, PR China;1. Department of Chemistry, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Republic of Korea;2. Department of Chemistry, University of Waterloo, Waterloo, ON, N2L 3G1, Canada;3. Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea |
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| Abstract: | Fe-based oxide electrodes for practical applications in supercapacitors (SCs) suffer from low conductivity and poor structural stability. To settle these issues, we report on the design and synthesis of Fe3O4/carbon nanocomposites via firmly anchoring mesoporous Fe3O4 nanospheres onto N-doped carbon nanotubes (N-CNTs) via C–O–Fe bonds. Mesoporous Fe3O4 nanospheres are featured by rich electroactive sites and short ion diffusion pathways. The N-CNTs, on the other hand, serve as the scaffolds, which not only provide conductive networks but also suppress the accumulation between mesoporous Fe3O4 nanospheres as well as alleviate volume changes during charge/discharge cycles. Accordingly, the constructed Fe3O4/N-CNTs nanocomposite electrode demonstrates improved specific capacity values of up to 314 C g?1 at 1 A g?1, with 92% retention of the initial capacity after 5000 cycles at 10 A g?1. In addition, the assembled Fe3O4/N-CNTs//active carbon (AC) asymmetric supercapacitor (ASC) device possesses an energy density of 25.3 Wh kg?1, suggesting that the prepared Fe3O4/N-CNTs nanocomposites are promising electrode materials for use in SCs. |
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| Keywords: | N-doped carbon nanotubes Nanocomposites Supercapacitors |
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