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Atomically thin mesoporous NiCo2O4grown on holey graphene for enhanced pseudocapacitive energy storage

Journal Article


Abstract


  • © 2020 The Royal Society of Chemistry. Pseudocapacitive energy storage via Li storage at the surface/interface of the electrode is promising for achieving both high energy density and high power density in lithium-ion batteries (LIBs). Thus, we created holey graphene (HG) via an etching method, and then in situ grew atomically thin mesoporous NiCo2O4 nanosheets on the HG surface, resulting in a NiCo2O4-HG heterostructure. Since both NiCo2O4 and HG possess atomic thickness and porous structures, the as-prepared nanocomposite enables efficient electrolyte diffusion and mass transfer, providing abundant accessible surface atoms for enhanced redox pseudocapacitance. Moreover, the strong coupling effect between NiCo2O4 and graphene produces an ultra-large interfacial area and enhanced electrical conductivity, and subsequently promotes the intercalation pseudocapacitance. Consequently, the NiCo2O4@HG exhibits a high specific capacity of 1103.4 mA h g-1 at 0.2C, ∼88.9% contribution from pseudocapacitance at 1 mV s-1, excellent rate capability, and ultra-long life up to 450 cycles with 931.2 mA h g-1 retention, significantly outperforming previously reported electrodes. This work suggests that the maximum exposure and utilization of the surface/interfacial active sites is vital for the construction of high-performance pseudocapacitive energy storage devices.

Authors


  •   Xia, Qingbing (external author)
  •   Cheng, Ningyan (external author)
  •   Ma, Jianmin (external author)
  •   Yuan, Ding (external author)
  •   Dou, Yuhai (external author)
  •   Xu, Li (external author)
  •   Yu, Linping (external author)
  •   Hencz, Luke (external author)
  •   Zhang, Shanqing. (external author)
  •   Dou, Shi Xue

Publication Date


  • 2020

Citation


  • Yuan, D., Dou, Y., Xu, L., Yu, L., Cheng, N., Xia, Q., Hencz, L., Ma, J., Dou, S. & Zhang, S. (2020). Atomically thin mesoporous NiCo2O4grown on holey graphene for enhanced pseudocapacitive energy storage. Journal of Materials Chemistry A, 8 (27), 13443-13451.

Scopus Eid


  • 2-s2.0-85089554137

Volume


  • 8

Place Of Publication


  • United Kingdom

Abstract


  • © 2020 The Royal Society of Chemistry. Pseudocapacitive energy storage via Li storage at the surface/interface of the electrode is promising for achieving both high energy density and high power density in lithium-ion batteries (LIBs). Thus, we created holey graphene (HG) via an etching method, and then in situ grew atomically thin mesoporous NiCo2O4 nanosheets on the HG surface, resulting in a NiCo2O4-HG heterostructure. Since both NiCo2O4 and HG possess atomic thickness and porous structures, the as-prepared nanocomposite enables efficient electrolyte diffusion and mass transfer, providing abundant accessible surface atoms for enhanced redox pseudocapacitance. Moreover, the strong coupling effect between NiCo2O4 and graphene produces an ultra-large interfacial area and enhanced electrical conductivity, and subsequently promotes the intercalation pseudocapacitance. Consequently, the NiCo2O4@HG exhibits a high specific capacity of 1103.4 mA h g-1 at 0.2C, ∼88.9% contribution from pseudocapacitance at 1 mV s-1, excellent rate capability, and ultra-long life up to 450 cycles with 931.2 mA h g-1 retention, significantly outperforming previously reported electrodes. This work suggests that the maximum exposure and utilization of the surface/interfacial active sites is vital for the construction of high-performance pseudocapacitive energy storage devices.

Authors


  •   Xia, Qingbing (external author)
  •   Cheng, Ningyan (external author)
  •   Ma, Jianmin (external author)
  •   Yuan, Ding (external author)
  •   Dou, Yuhai (external author)
  •   Xu, Li (external author)
  •   Yu, Linping (external author)
  •   Hencz, Luke (external author)
  •   Zhang, Shanqing. (external author)
  •   Dou, Shi Xue

Publication Date


  • 2020

Citation


  • Yuan, D., Dou, Y., Xu, L., Yu, L., Cheng, N., Xia, Q., Hencz, L., Ma, J., Dou, S. & Zhang, S. (2020). Atomically thin mesoporous NiCo2O4grown on holey graphene for enhanced pseudocapacitive energy storage. Journal of Materials Chemistry A, 8 (27), 13443-13451.

Scopus Eid


  • 2-s2.0-85089554137

Volume


  • 8

Place Of Publication


  • United Kingdom