Ultrathin NiO nanosheets anchored to a nitrogen-doped dodecahedral carbon framework for aqueous potassium-ion hybrid capacitors
(2024) Journal of Materials Chemistry A — Vol. 12, n° 29, p. 18157-18166 (2024)
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Zong, Wei 
Lai, Feili
- Abstract
- Hierarchical porous structures and well-modulated interfacial interactions are essential for the performance of electrode materials. The energy storage performance can be promoted by regulating the diffusion behavior of the electrolyte and constructing a coupled interaction at heterogeneous interfaces. Herein, we have synthesized ultrathin NiO nanosheets anchored to nitrogen-doped hierarchical porous carbon (NiO/N-HPC) and applied it to construct aqueous potassium ion hybrid capacitors (APIHCs). The abundant and interconnected porous architecture promotes electrolyte penetration/diffusion and shortens the ion transport path, thereby accelerating storage reaction kinetics. The nitrogen-doped carbon support can achieve optimized metal oxides–carbon interaction and enhance the adsorption ability for the electrolyte ions, leading to earning higher storage capacity. Consequently, the prepared NiO/N-HPC exhibits a superior capacitance of 126.4 F g−1 at a current density of 0.5 A g−1, and the as-fabricated NiO/N-HPC//N-HPC APIHC achieves an ultra-high capacitance retention of 91.6% over 8000 cycles at a current density of 2 A g−1. Meanwhile, the APIHC device shows an excellent energy density of 21.95 W h kg−1 and a power density of 9000 W kg−1.
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Citations
Wang, T., Zong, W., Yang, J., Zhang, L., Meng, J., Ge, J., Yang, G., Ren, J., He, P., Debroye, E., Gohy, J.-F., Liu, T., & Lai, F. (2024). Ultrathin NiO nanosheets anchored to a nitrogen-doped dodecahedral carbon framework for aqueous potassium-ion hybrid capacitors. Journal of Materials Chemistry A, 12(29), 18157-18166. https://doi.org/10.1039/d4ta01608d (Original work published 2024)