Controllable fabrication of ZnCo2O4 ultra-thin curved sheets on Ni foam for high-performance asymmetric supercapacitors

Trifunctional of Phosphorus-Doped NiCo2O4 Nanowire Materials for Asymmetric Supercapacitor, Oxygen Evolution Reaction, and Hydrogen Evolution Reaction

“…In recent research studies, MCo 2 O 4 (M = Co, Ni, Zn, and Mn) with a spinel structure as the electrode materials and electrocatalysts has been reported. − Among various spinel oxides, NiCo 2 O 4 shows high theoretical specific capacitance, electrochemical stability, and great catalytic activity in alkaline electrolytes. However, the NiCo 2 O 4 was restricted by its poor electronic conductivity and insufficient active sites, which are the main barriers. , Therefore, it is necessary to improve the electrochemical activity of NiCo 2 O 4 , and various strategies have been developed.…”

Template Synthesis of a Heterostructured MnO2@SnO2 Hollow Sphere Composite for High Asymmetric Supercapacitor Performance

“…However, its energy density is lower than 10 Wh/kg owing to the narrow potential window. For the purpose of broadening the electrochemical window of the pseudocapacitor in an aqueous electrolyte (∼1.23 V), the concept of asymmetric supercapacitors is proposed. − …”

Recent progress in ZnCo2O4 and its composites for energy storage and conversion: a review

“…Therefore, the challenge to fabricate highly efficient binder-free electrode materials capable of storing rapidly larger amounts of energy, at low cost, can be achieved by using ZnCo2O4modified electrodes. Hence, binder-free electrodes based on pristine ZnCo2O4 nanorods 78,79 , nanobelts 80 , nanoribbons 81 , nanoflowers 82 , nanoflakes 83,84 , nanosheets [85][86][87][88][89] , nanomuscles 90 , nanowires 65,91 , nanoleaves 92 , nanocubes 93 , micro-urchins 94,95 , nanoneedles 89 were also reviewed for supercapacitor applications (Table 2) and will be discussed along with slurry-casted electrodes according to their morphology. 19…”

“…This can partially buffer the strain effect through the charge-discharge processes, improve the specific surface area and active sites availability, and lower the interior resistance, facilitating electron transfer and resulting in such high specific capacitance. Aside from 3D ZnCo2O4 NPs, the literature have reported a series of 2D-structured ZnCo2O4, such as micro- 60 and nanosheets [70][71][72][73][85][86][87][88][89] , nanoplates 56 , nanoflakes 83,84 , nanoleaves 92 , nanobelts 80 , nanoribbons 81 , and those based on radial growth of nanosheets, i.e., micro- 65,66 and nanoflowers 74,82 . In addition, there are 1D-structured ZnCo2O4, such as urchin-like microspheres 64 , nanorods 75,78,79 and nanotubes 77 .…”

“…When assembled in binder-free electrodes on the other hand, sheet-like ZnCo2O4 materials present superb specific capacitance, rate capability and cycling stability and are quite competitive 80,81,[83][84][85][86][87][88][89]92 . Nanosheets are the most studied 2D morphology of ZnCo2O4 [85][86][87][88] , featuring porous nanosheets networks on NF (3.19 F cm -2 at 2 mA cm -2 ) 86 , intertwined nanosheet arrays on CC (1750 F g -1 at 1.5 A g -1 ) 87 and NF (400 F g -1 at 1 A g -1 ) 88 , ultra-thin curved nanosheet arrays on NF (1848.9 F g -1 at 5 A g -1 ) 85 (Figure 4B). Those materials presented high rate-capabilities and cycling stabilities, besides porous nanosheets networks on NF 86 with a capacitance retention of 72.5% after 2500 cycles.…”