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SCIENCE CHINA Materials, Volume 61, Issue 2: 273-284(2018) https://doi.org/10.1007/s40843-017-9064-6

Facile synthesis of T-Nb2O5 nanosheets/nitrogen and sulfur co-doped graphene for high performance lithium-ion hybrid supercapacitors

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  • ReceivedMay 22, 2017
  • AcceptedJun 16, 2017
  • PublishedAug 8, 2017

Abstract

Li-ion hybrid supercapacitors (Li-HSCs) have attracted increasing attention as a promising energy storage device with both high power and energy densities. We report a facile two-step hydrothermal method to prepare the orthorhombic niobium oxide (T-Nb2O5) nanosheets supported on nitrogen and sulfur co-doped graphene (T-Nb2O5/NS-G) as anode for Li-HSCs. X-ray diffraction and morphological analysis show that the T-Nb2O5 nanosheets successfully and uniformly distributed on the NS-G sheets. The T-Nb2O5/NS-G hybrid exhibits great rate capability (capacity retention of 63.1% from 0.05 to 5 A g−1) and superior cycling stability (a low capacity fading of ~6.4% after 1000 cycles at 0.5 A g−1). The full-cell consisting of T-Nb2O5/NS-G and active carbon (AC) results in high energy density (69.2 W h kg−1 at 0.1 A g−1), high power density (9.17 kW kg−1) and excellent cycling stability (95% of the initial energy after 3000 cycles). This excellent performance is mainly attributed to the highly conductive NS-G sheets, the uniformly distributed T-Nb2O5 nanosheets and the synergetic effects between them. These encouraging performances confirm that the obtained T-Nb2O5/NS-G has promising prospect as the anode for Li-HSCs.


Funded by

 the National Natural Science Foundation of China(21576138,51572127)

China-Israel Cooperative Program(2016YFE0129900)

Program for NCET-12-0629

Ph.D. Program Foundation of Ministry of Education of China(20133219110018)

Natural Science Foundation of Jiangsu Province(BK20160828)

Post-Doctoral Foundation(1501016B)

Six Major Talent Summit(XNY-011)

and PAPD of Jiangsu Province

and the program for Science and Technology Innovative Research Team in Universities of Jiangsu Province

China.


Acknowledgment

This work was supported by the National Natural Science Foundation of China (21576138 and 51572127), China-Israel Cooperative Program (2016YFE0129900), Program for NCET-12-0629, PhD Program Foundation of Ministry of Education of China (20133219110018), the Natural Science Foundation of Jiangsu Province (BK20160828), Post-Doctoral Foundation (1501016B), Six Major Talent Summit (XNY-011), and PAPD of Jiangsu Province, and the program for Science and Technology Innovative Research Team in Universities of Jiangsu Province, China. We also thank Dr. Huaping Bai and Dr. Wanying Tang at the Analysis and Test Center, Nanjing University of Science and Technology for the XRD and Raman data collection.


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

Hao Q designed and engineered the experiments, and guided the whole process of writing and submission of the current paper; Jiao X performed the experiments, analyzed the data and wrote the paper with support from Liu P, Xia X, Lei W and Liu X. All authors contributed to the general discussion.


Author information

Xinyan Jiao received her BE degree in materials chemistry from Nanjing University of Science and Technology in 2010. Now she is a PhD candidate at the College of School of Chemical Engineering, Nanjing University of Science and Technology. Her recent research focuses on metal oxide/carbon nanocomposites for electrochemical energy storage systems.


Qingli Hao is a professor in materials chemistry at Nanjing University of Science and Technology. She received her PhD degree in chemistry from the University of Regensburg in 2003. Her research interest focuses on functional nanomaterials and their application in energy storage and conversion systems and chemical sensors.


Supplement

Supplementary information

Supporting data are available in the online version of the paper.


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  • Figure 1

    Schematic diagram of the synthesis of T-Nb2O5/NS-G hybrid.

  • Figure 2

    (a) XRD patterns of the Nb2O5 precursor/NS-G and T-Nb2O5/NS-G hybrid. TEM images of the NS-G (b), Nb2O5 precursor/NS-G (c) and T-Nb2O5/NS-G hybrid (d, e). (f) HRTEM image and SAED pattern of the T-Nb2O5/NS-G hybrid.

  • Figure 3

    (a) Raman spectra of the GO, NS-G and T-Nb2O5/NS-G hybrid. (b) TGA curve of the T-Nb2O5/NS-G hybrid.

  • Figure 4

    (a) Overview XPS spectrum of the T-Nb2O5/NS-G hybrid. (b–e) High-resolution spectra of C 1s (b), N 1s (c) , S 2p (d) and Nb 3d (e) of the T-Nb2O5/NS-G hybrid.

  • Figure 5

    (a) CV curves and (b) specific peak currents of T-Nb2O5/NS-G hybrid at sweep rates from 0.1 to 0.7 mV s−1. (c) CV curves of T-Nb2O5/NS-G with separation between total currents and capacitive currents at 0.1 mV s−1. (d) Capacitive contributions of T-Nb2O5/NS-G at various sweep rates.

  • Figure 6

    (a) Galvanostatic charge/discharge profiles of T-Nb2O5/NS-G hybrid at 0.05 A g−1. (b) Rate capacity of the T-Nb2O5, T-Nb2O5/rGO and T-Nb2O5/NS-G hybrid at current densities ranging from 0.05 to 5 A g−1. (c) Cycling performance of the T-Nb2O5, T-Nb2O5/rGO and T-Nb2O5/NS-G hybrid at 0.1 A g−1. (d) Cycling performance of the T-Nb2O5/NS-G hybrid and the corresponding Coulombic efficiency at 0.4 A g−1.

  • Figure 7

    (a) CV curves of T-Nb2O5/NS-G//AC at various scan rates. (b, c) Galvanostatic charge/discharge curves of T-Nb2O5/NS-G//AC at different current densities. (d) Cycling performance of T-Nb2O5/NS-G//AC.

  • Figure 8

    Ragone plots of T-Nb2O5/NS-G//AC.

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