Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced supercapacitors and sodium-ion batteries

Abstract

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 Co 2 NiSe 4 arrays grown on butterfly wings derived three-dimensional (3D) carbon framework (Z-Co 2 NiSe 4 /BWC) is fabricated via hydrothermal assembly and further conversion method. Benefiting from its unique structure and multi-components, the obtained Z-Co 2 NiSe 4 /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 Co 2 NiSe 4 /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-Co 2 NiSe 4 /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 (1D) 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.

Growing Co–Ni–Se nanosheets on 3D carbon frameworks as advanced dual functional electrodes for supercapacitors and sodium ion batteries

“…All GCD curves of Co–Ni–Se/BWCF-160 are approximately symmetric with negligible internal resistance drop, indicating fast reaction kinetics and reversible supercapacitor behaviour. 37 Based on the CV and GCD curves of Co–Ni–Se/BWCF-140, Co–Ni–Se/BWCF-160 and Co–Ni–Se/BWCF-180 electrodes, better electrochemical capacitance characteristics of the Co–Ni–Se/BWCF-160 electrode could be obtained compared with the other two electrodes. The specific capacity of the Co–Ni–Se/BWCF-160 electrode is as high as 3050 F g −1 at 1.0 A g −1 and maintained 1006 F g −1 at 20.0 A g −1 .…”

Bacteria‐Assisted Synthesis of Fe‐Co‐Ni‐S/Hollow Carbon Spheres as High‐Performance Supercapacitor Electrode Materials

“…The EIS testing was conducted in the frequency range of 0.01 ∼ 10 5 Hz, with a potential amplitude of 5 mV. The specific capacitance (C) is calculated via the following equation: [22] C ¼ 2J R Vdt DV 2 (1)…”

RGO-Coated MOF-Derived In₂Se₃ as a High-Performance Anode for Sodium-Ion Batteries

“…The combination of multiple advantages makes metal selenides promising candidates. It is also worth mentioning that metal selenide has a low operating voltage range 24 , effectively avoiding the formation of sodium dendrites 25 , which is conducive to ensuring the safe use of the battery. Notwithstanding, in the process of insertion/de-insertion of Na + , metal selenides are confronted with large volume expansion/shrinkage 26 , easy agglomeration, and poor electrical conductivity 27 , which leads to their poor cyclic stability and inadequate capacity performance.…”