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

Journal Article


Abstract


  • 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.

Publication Date


  • 2020

Citation


  • Yuan, D., Dou, Y., Xu, L., Yu, L., Cheng, N., Xia, Q., . . . Zhang, S. (2020). Atomically thin mesoporous NiCo2O4grown on holey graphene for enhanced pseudocapacitive energy storage. Journal of Materials Chemistry A, 8(27), 13443-13451. doi:10.1039/d0ta03007d

Scopus Eid


  • 2-s2.0-85089554137

Start Page


  • 13443

End Page


  • 13451

Volume


  • 8

Issue


  • 27

Place Of Publication


Abstract


  • 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.

Publication Date


  • 2020

Citation


  • Yuan, D., Dou, Y., Xu, L., Yu, L., Cheng, N., Xia, Q., . . . Zhang, S. (2020). Atomically thin mesoporous NiCo2O4grown on holey graphene for enhanced pseudocapacitive energy storage. Journal of Materials Chemistry A, 8(27), 13443-13451. doi:10.1039/d0ta03007d

Scopus Eid


  • 2-s2.0-85089554137

Start Page


  • 13443

End Page


  • 13451

Volume


  • 8

Issue


  • 27

Place Of Publication