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In this paper, the N-doped graphene nanotubes (N-GNTs) are used as the scaffolds to grow α-Fe 2 O 3 nanoparticles (NPs) and Ni(OH) 2 nanosheets arrays (NAs)/Co 0.85 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 2 O 3 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) 2 NAs/Co 0.85 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. • The two advanced hybrid electrode materials were prepared respectively. • The electrodes show ultrahigh specific capacity and good rate performance. • An alkaline rechargeable battery with the two electrodes was successfully assembled. • The device can present high energy density and outstanding cycling performance. [ABSTRACT FROM AUTHOR]