Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced su

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Developing suitable electrode materials for electrochemical energy storage devices by biomorph assisted design has become a fascinating topic due to the fantastic properties derived from bio-architectures.Herein,zephyranthes-like Co2NiSe4 arrays grown on butterfly wings derived three-dimensional (3D) carbon framework (Z-Co2NiSe4/BWC) is fabricated via hydrothermal assembly and further conversion method.Benefiting from its unique structure and multi-components,the obtained Z-Co2NiSe4/BWC electrode for supercapacitor delivers an excellent specific capacitance of 2,280 F·g-1 at 1 A·g-1.Impressively,the constructed asymmetric supercapacitor using Co2NiSe4/BWC as positive electrode and activated butterfly wings carbon as negative electrode acquires a high energy density of 42.9 Wh·kg-1 at a power density of 800 W·kg-1 with robust stability of 94.6% capacitance retention at 10 A·g-1 after 5,000 cycles.Moreover,the Z-Co2NiSe4/BWC as anode for sodium-ion batteries exhibits a high specific capacity of 568 mAh·g-1 at 0.1 A·g-1 and high cycling stability (maintaining 80.1% of the second cycle after 100 cycles).The outstanding electrochemical performances are ascribed to that the synergistic effect of bimetallic selenides and N-doped carbon improves electrochemical activities and conductivity.One-dimensional (1 D) nanoneedles grown on 3D porous framework increase the exposure of redox-active sites,endow adequate transmission channels of electrons/ions,and guarantee stability of the electrode during charge/discharge processes.This study will shed light on the avenue towards extending such nanohybrids to excellent energy storage applications.
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