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Introducing oxygen vacancies for improving the electrochemical performance of Co9S8@NiCo-LDH nanotube arrays in flexible all-solid battery-capacitor hybrid supercapacitors

Author

Listed:
  • Liu, Mengjie
  • Wang, Lei
  • Yu, Xinyao
  • Zhang, Hao
  • Zhang, Hui
  • Li, Shikuo
  • Huang, Fangzhi

Abstract

In this work, rich oxygen vacancies are obtained in Co9S8@NiCo-LDH core-shell nanotube arrays (NTAs), which boost its electrochemical energy storage performance. The flexible carbon cloth (CC) supported Co9S8@NiCo-LDH NTAs are synthesized by situ growth and electrodeposition method. After reacting with NaBH4, the rich oxygen vacancies are generated in NiCo-LDH nanosheets to obtain Co9S8@oxygen vacancies-NiCo-LDH NTAs (Co9S8@OV-NiCo-LDH NTAs). These oxygen vacancies increase the charge transfer rate in the multi-level redox processes and make the electrochemical performance improve sharply. At a current density of 0.5 A g−1, the mass specific capacity of Co9S8@OV-NiCo-LDH NTAs is up to 1335 C g−1, which is more than four times higher than that of the untreated Co9S8@NiCo-LDH NTAs. In addition, with the prepared Co9S8@OV-NiCo-LDH core-shell NTAs as a positive electrode, along with the negative electrode of activated carbon (AC), a high-performance flexible all-solid battery-capacitor hybrid supercapacitors (HSC) device is assembled. The maximum energy density is up to 101.1 Wh kg−1 when the power density is 800 W kg−1.

Suggested Citation

  • Liu, Mengjie & Wang, Lei & Yu, Xinyao & Zhang, Hao & Zhang, Hui & Li, Shikuo & Huang, Fangzhi, 2022. "Introducing oxygen vacancies for improving the electrochemical performance of Co9S8@NiCo-LDH nanotube arrays in flexible all-solid battery-capacitor hybrid supercapacitors," Energy, Elsevier, vol. 238(PB).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pb:s0360544221020156
    DOI: 10.1016/j.energy.2021.121767
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    Cited by:

    1. Ponce, M. Federico & Mamani, Arminda & Jerez, Florencia & Castilla, Josué & Ramos, Pamela B. & Acosta, Gerardo G. & Sardella, M. Fabiana & Bavio, Marcela A., 2022. "Activated carbon from olive tree pruning residue for symmetric solid-state supercapacitor," Energy, Elsevier, vol. 260(C).
    2. Olabi, Abdul Ghani & Abbas, Qaisar & Al Makky, Ahmed & Abdelkareem, Mohammad Ali, 2022. "Supercapacitors as next generation energy storage devices: Properties and applications," Energy, Elsevier, vol. 248(C).
    3. Sakthivel, Mani & Ramki, Settu & Chen, Shen-Ming & Ho, Kuo-Chuan, 2022. "Defect rich Se–CoWS2 as anode and banana flower skin-derived activated carbon channels with interconnected porous structure as cathode materials for asymmetric supercapacitor application," Energy, Elsevier, vol. 257(C).

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