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Key Words:Secondary batteries;Display devices - Doping (additives) - Electrodes - Graphene - Hematite - Nanoparticles - Nanotubes - Nickel compounds - Selenium compounds

Abstract:In this paper, the N-doped graphene nanotubes (N-GNTs) are used as the scaffolds to grow α-Fe<inf>2</inf>O<inf>3</inf> nanoparticles (NPs) and Ni(OH)<inf>2</inf> nanosheets arrays (NAs)/Co<inf>0.85</inf>Se nanoparticles (NPs) respectively, which are directly acted as hybrid negative and positive electrodes for alkaline rechargeable battery (ARB). The synergistic merits from the supporters and active materials enable the N-GNTs@ α-Fe<inf>2</inf>O<inf>3</inf> NPs to deliver an ultrahigh specific capacity of 309 mAh g⁻¹ at 1 A g⁻¹, and good rate performance. By paring with the N-GNTs@ Ni(OH)<inf>2</inf> NAs/Co<inf>0.85</inf>Se NPs (268 mAh g⁻¹ at 1 A g⁻¹), an ARB configuration is assembled. Contributed by the particular electrode architectures, the device displays a high energy density of 78.8 Wh kg⁻¹ at 2.47 kW kg⁻¹ and robust cycling life (91.3% retention of the initial specific capacity over 10,000 cycles). This strategy reported here opens up a new avenue to construct unique hybrid electrodes and maximizes their superiority, which leads to the ultrahigh capacity for the fabrication of next-generation energy storage devices.<br/> © 2020 Elsevier Inc.

Volume:165

Issue:-

Translation or Not:no

Pre One:NiCoSe2/Ni3Se2 lamella arrays grown on the N-doped graphene nanotubes with ultrahigh-rate capability and long-term cycling for asymmetric supercapacitor Next One:Oxygen-vacancy Bi<inf>2</inf>O<inf>3</inf> nanosheet arrays with excellent rate capability and CoNi<inf>2</inf>S<inf>4</inf> nanoparticles immobilized on N-doped graphene nanotubes as robust electrode materials for high-energy asymmetric supercapacitors