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Sulfur-deficient Co9S8/Ni3S2 nanoflakes anchored on N-doped graphene nanotubes as high-performance electrode materials for asymmetric supercapacitors

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Abstract

In this paper, Co9S8/Ni3S2 nanoflakes (NFs) with sulfur deficiencies were grown in-situ on N-doped graphene nanotubes (N-GNTs). They were successfully prepared through electrodeposition followed by hydrogenation treatment, which is able to act as a self-supported electrode for asymmetric supercapacitors (ASCs). Combining the defect-rich active materials with highly conductive skeletons, the hybrid electrode N-GNTs@sd-Co9S8/Ni3S2 NFs show ultrahigh specific capacity of ∼304 mA h g−1 and prominent rate capability (capacity retention ratio of ∼85% even at 100 A g−1), and deliver a long cycling lifespan of ~1.9% capacitance loss after 10000 cycles. In addition, an ASC was constructed using the as-synthesized composite electrode as the positive electrode and active carbon (AC) as the negative electrode. The fabricated device shows a high energy density of ~45.1 Wh kg−1 at ~3.4 kW kg−1 and superior cycling stability. This work substantiates a smart strategy to fabricate novel composite electrode materials for next-generation supercapacitors by incorporating riched deficiencies into nanostructures.

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Authors and Affiliations

  1. Key Laboratory of Polymer Material Advanced Manufacturing Technology of Shandong Provincial, College of Electromechanical Engineering, College of Sino-German Science and Technology, Qingdao University of Science and Technology, Qingdao, 266061, China

    Jian Zhao, GuanYing Song, ZhenJiang Li & QingDang Li

  2. State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    XiangCheng Yuan, Tong Shen, ALan Meng & YuSheng Lin

  3. Ocean College, Zhejiang University, Zhoushan, 316021, China

    QingYan Jiang

Authors
  1. Jian Zhao
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  2. GuanYing Song
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  3. XiangCheng Yuan
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  4. Tong Shen
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  5. QingYan Jiang
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  6. ALan Meng
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  7. YuSheng Lin
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  8. ZhenJiang Li
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  9. QingDang Li
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Corresponding author

Correspondence to ZhenJiang Li.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51672144, 51572137, 51702181), the Key Research and Development Program of Shandong Province (Grant No. 2019GGX102055), the Natural Science Foundation of Shandong Province (Grant Nos. ZR2017BB013, ZR2019BEM042), the Higher Educational Science and Technology Program of Shandong Province (Grant Nos. J17KA014, J18KA001, J18KA033), the Taishan Scholars Program of Shandong Province (Grant No. 201511034), and the Overseas Taishan Scholars Program.

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11431_2019_1495_MOESM1_ESM.doc

Sulfur-deficient Co9S8/Ni3S2 nanoflakes anchored on N-doped graphene nanotubes as high-performance electrode materials for asymmetric supercapacitors

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Zhao, J., Song, G., Yuan, X. et al. Sulfur-deficient Co9S8/Ni3S2 nanoflakes anchored on N-doped graphene nanotubes as high-performance electrode materials for asymmetric supercapacitors. Sci. China Technol. Sci. 63, 675–685 (2020). https://doi.org/10.1007/s11431-019-1495-8

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