Multidimensional and Binary Micro CuCo₂O₄/Nano NiMoO₄ for High-Performance Supercapacitors

Abstract

A multidimensional micro CuCo2O4/nano NiMoO4 architecture is prepared on Ni foam by the hydrothermal method. The structure consists of urchinlike CuCo2O4 microspheres covered by ultrathin NiMoO4 nanosheets. The synergistic effect depends on the diversity of space and composition. The one-dimensional CuCo2O4 nanoneedles enhance the charge transport and carry the two-dimensional NiMoO4 nanosheets. The nanosheets can expose abundant active sites and act as an armor to alleviate the volume change and maintain the structural integrity during long-term cycling. The three-dimensional skeleton integrates the intrinsic properties and external spatial effect of each component. The corresponding supercapacitor exhibits a high specific capacity of 276 mAh g–1 at 1 A g–1, good rate capability, and excellent cycling stability of 98.3% over 8000 cycles. The concept of integrating the multidimensionality and multicomponent provides a universal approach to develop high-performance materials.

Multi‐Path Electron Transfer in 1D Double‐Shelled Sn@Mo2C/C Tubes with Enhanced Dielectric Loss for Boosting Microwave Absorption Performance

“…This procedure can be roughly divided into two parts: Stage i, etching MoO 3 into MoO2‐4 by ammonia; Stage ii, the formation of Mo‐PDA coordination polymer by a reaction between MoO2‐4 and DA. [ 33 ] When the reaction goes on for 3 min, the MoO 3 belt is partially dissolved to form soluble MoO2‐4(Figure 3a). Increasing the reaction time to just 20 min (Figure 3c), MoO 3 has been completely etched with the sparse coating of 2D Mo‐PDA nanosheets (Figure 1a,1e), which means that the formation of Mo‐PDA (Stage ii) is much slower than the etching of MoO 3 (Stage i).…”

“…[1][2][3][4][5] 1D materials with fibrous, [6,7] rodlike, [8] belt-like, [9] tubular, [10,11] or cable-like [12] structures can be promising microwave absorbers by virtue of their superiorities units. [32,33] Especially, the 1D tubular double-shelled structure constructed from multi-dimensional subunits are supposed to provide more pathways for electron transfer to obtain more excellent microwave absorption (MA) performance. However, it is a difficult and complex procedure to assemble multi-component and multi-dimensional materials with reasonable structural design to develop 1D tubular double-shelled composites for boosting MA performance.…”

NiMoO4@NiMnCo2O4 Heterostructure: A Poly(3,4-propylenedioxythiophene) Composite-Based Supercapacitor Powers an Electrochromic Device

“…Direct growth of the electroactive material on the current collector is a facile approach, for it does away with the need for preparing smooth lump-free slurries with polymer binder and carbon black. In a study on urchinlike CuCo 2 O 4 microspheres covered by ultrathin NiMoO 4 (NMO) nanosheets grown directly on Ni-foam, the CuCo 2 O 4 nanoneedles allowed for fast charge transport and the NMO sheets buffered the volume change during ion ingress and egress, thus imparting high SC and long cycle life simultaneously . The combination of a metal-doped NMO with a carbon nanostructure (such as Mn-doped NMO and RGO) has also been found to be an efficient strategy for fabricating symmetric devices capable of delivering wide voltage windows (∼1.8 V) and high SC, superior to those achieved with pristine metal oxides .…”

CuCo2O4 Nanorods Coated with CuO Nanoneedles for Supercapacitor Applications

“…8,9 The synergistic effect and structural interconnectivity of the components of the core−shell heterostructures provide a large surface area and a shorter diffusion path for electrons and ions, alleviate porosity, prevent aggregation, and offer proper utilization of the underlying material. 10,11 CuCo 2 O 4 is a binary metal oxide with superior electronic conductivity and electrochemical activity. 12 However, its theoretical capacitance and poor structural sustainability during redox reactions limit its applicability as an electrode material for high-performance SCs.…”

“…In recent years, binary metal oxide composites and the core–shell structures have been widely explored to achieve synergistic effects that enhance the electrochemical properties of SCs to circumvent the limitations of monometal oxides. Furthermore, the electrochemical performance of the electrode material also depends on the rational design, crystal structure, morphological diversity, physical strength, and mechanical stability of the nanostructured electroactive electrode material. , The synergistic effect and structural interconnectivity of the components of the core–shell heterostructures provide a large surface area and a shorter diffusion path for electrons and ions, alleviate porosity, prevent aggregation, and offer proper utilization of the underlying material. , …”