Novel Rugby-Ball-like FeCoCuS₂ Triple-Shelled Hollow Nanostructures with Enhanced Performance for Supercapattery

Abstract

The design of efficient electrode materials with hierarchical properties is of considerable importance to the further expansion of electrochemical energy storage devices. Herein, we develop an elaborate synthesis and design of novel hierarchical rugby-ball-like FeCoCuS2 triple-shelled hollow nanostructures (RB-FCC) by a metal–organic-framework-engaged strategy. Because of its hierarchical structure and compositional advantages, the as-fabricated RB-FCC electrode delivers remarkable electrochemical properties with a specific capacity of 1060 C g–1 at 2 A g–1 and a superior cycle stability of 96.5% with a retention over 7000 cycles in a three-electrode system. Considering the prominent results achieved, a hybrid supercapacitor was made with RB-FCC as cathode materials and AC (activated carbon) as anode electrodes in 3 M KOH. The as-prepared apparatus (RB-FCC (+)||AC(−) produced a desirable capacity of 133.5 F g–1 at 1 A g–1, an outstanding rate capability around 65.3% at 30 A g–1, a high specific energy of 48.2 W h kg–1, and a specific power of up to 25700.2 W kg–1 in an (RB-FCC) (+)||AC(−) device.

Hierarchical Cube-in-Cube Cobalt–Molybdenum Phosphide Hollow Nanoboxes Derived from the MOF Template Strategy for High-Performance Supercapacitors

“…19 Also, the slight shift of the peaks to more a positive and negative potential might be due to the electrode polarization or internal resistance of the electrode materials. 16,19 To evaluate the charge storage kinetics, calibration curves of oxidative/reductive peak currents (i p ) versus the square root of scan rates (υ) 1/2 were plotted (Figure 5d). Through this calibration curve, the diffusion-controlled charge mechanism of the CoMoP-DSHNB electrode can be calculated.…”

“…Particularly, the interaction between different metal ions can effectively modulate the three-dimensional electronic nanostructure, leading to fast transport of ions and charges, more accessible redox sites, and improve the ionelectron transfer kinetics. 16,19 Transitional metal phosphides/phosphates (TMPs) have received notable attention due to their metallic characteristics, high electrical conductivity, and superb specific capacity. 12,19,20 Specifically, phosphorous as a multivalent nonmetal is considered as one of the well-stablished donor atom in coordination chemistry.…”

“…However, these type of templating strategies practically have some difficulties, including tedious procedure and incompatibility of desired materials and template surfaces . As such, choosing appropriate templates should be the key point of preparing the complex hollow structures. , Metal–organic frameworks (MOFs), as a new kind of hybrid porous, crystalline materials consisting of metal ions and organic ligands, have been widely utilized in different fields such as imaging, sensing, gas storage/separation, drug delivery, energy storage, and catalysis. ,,, Their interesting properties, such as tailorable architecture, diversity of applicable metals and organic linkers, high porosity, and large specific surface area, make these materials one of the main research targets for different applications during the past decades. , With respect to prepare hollow structures, MOFs can be considered as both metal precursors and removable templates for preparing well-defined MOF-derived hollow structure materials . The diversity of MOFs with different sizes and shapes has widened their applicability as a choice of templates .…”

Fabrication of nanosheet-assembled hollow copper–nickel phosphide spheres embedded in reduced graphene oxide texture for hybrid supercapacitors

“…With their large-scale applications and ever-increasing importance, ESDs such as sodium-ion batteries, supercapacitors, and lithium-ion batteries are receiving particular attention. [3][4][5] Due to their notable features such as high safety, fast charge-discharge rates, excellent longevity, and highpower output, supercapacitors are gaining extensive attention. [6][7][8][9][10][11][12] Nevertheless, one of the marked disadvantages of supercapacitors is their limited energy density (ED).…”

A high-performance hybrid supercapacitor by encapsulating binder-less FeCoSe2 nanosheets@NiCoSe2 nanoflowers in a graphene network

“…carbon-based materials) as anodes and faradaic battery-type materials. 16–18 The enhancement of the energy density of hybrid supercapacitors depends strongly on the development of battery-like electrode materials as cathode electrodes. 19,20 The battery-like materials should possess copious electroactive sites for faradaic redox reactions, enough conductivity for effective charge transfer, a highly porous nature for rapid ion transport, and a high surface area for charge storage.…”