“…Metal compounds, such as CO‐Co 3 O 4 , 79 MnO 2 , 80 CoS 2 , 81 NiCo 2 O 4 , 82 and NiO, have been widely used in the field of supercapacitors. Metal compounds as electrode materials have high specific capacitance, but because of the poor conductivity of metal compounds, the cycle stability and rate capability are poor.…”
Section: Binary Complexesmentioning
confidence: 99%
“…In addition, asymmetrical dual‐battery supercapacitors with Co‐Co 3 O 4 @carbon nanotubes‐NC as anode and reduced GO as cathode exhibit a high energy density of 46.7 Wh/kg at 1601.1 W/kg. Zhou et al 80 successfully prepared porous carbon nanosheets (PCNs) by using one‐step activation and carbonization of natural hollow tubular dandelion villi. Figure 11B shows the preparation process of porous carbon nanosheets derived from the dandelion fluffs by one‐step activation and carbonization treatment.…”
Section: Binary Complexesmentioning
confidence: 99%
“…(F) Specific capacitances of MnO 2 /PCNs composite at various current densities. Reproduced with permission: 2018, Elsevier B.V 80 . SEM images of (G) Zn/Co‐ZIF precursor, (H) Co/NC‐CNT‐p, and (I) CoS 2 /NSC‐CNT‐p.…”
As a type of energy storage device between traditional capacitors and batteries, the supercapacitor has the advantages of energy saving and environmental protection, high power density, fast charging and discharging speed, long cycle life, and so forth. One of the key factors affecting the performance of supercapacitor is the electrode material. Carbon materials, such as carbon nanotube, graphene, activated carbon, and carbon nanocage, are most widely concerned in the application of supercapacitors. The synergistic effect of composites can often obtain excellent results, which is one of the common strategies to increase the electrochemical performance of supercapacitors. To further improve the performance of binary composites, it is a relatively simple method to increase the components as the "bridge" between the two materials to form the ternary composites. The review mainly introduces the current research progress of supercapacitors with pure carbon nanomaterials and multistage carbon nanostructures (composites) as electrodes. The characteristics and application directions of different pure carbon nanomaterials are introduced in detail. Different ways of multilevel structure (material) composite have their own effects on the development of high-performance supercapacitors. We also highlight the recent advances related to these fields and provide our insight into high-energy supercapacitors.
“…Metal compounds, such as CO‐Co 3 O 4 , 79 MnO 2 , 80 CoS 2 , 81 NiCo 2 O 4 , 82 and NiO, have been widely used in the field of supercapacitors. Metal compounds as electrode materials have high specific capacitance, but because of the poor conductivity of metal compounds, the cycle stability and rate capability are poor.…”
Section: Binary Complexesmentioning
confidence: 99%
“…In addition, asymmetrical dual‐battery supercapacitors with Co‐Co 3 O 4 @carbon nanotubes‐NC as anode and reduced GO as cathode exhibit a high energy density of 46.7 Wh/kg at 1601.1 W/kg. Zhou et al 80 successfully prepared porous carbon nanosheets (PCNs) by using one‐step activation and carbonization of natural hollow tubular dandelion villi. Figure 11B shows the preparation process of porous carbon nanosheets derived from the dandelion fluffs by one‐step activation and carbonization treatment.…”
Section: Binary Complexesmentioning
confidence: 99%
“…(F) Specific capacitances of MnO 2 /PCNs composite at various current densities. Reproduced with permission: 2018, Elsevier B.V 80 . SEM images of (G) Zn/Co‐ZIF precursor, (H) Co/NC‐CNT‐p, and (I) CoS 2 /NSC‐CNT‐p.…”
As a type of energy storage device between traditional capacitors and batteries, the supercapacitor has the advantages of energy saving and environmental protection, high power density, fast charging and discharging speed, long cycle life, and so forth. One of the key factors affecting the performance of supercapacitor is the electrode material. Carbon materials, such as carbon nanotube, graphene, activated carbon, and carbon nanocage, are most widely concerned in the application of supercapacitors. The synergistic effect of composites can often obtain excellent results, which is one of the common strategies to increase the electrochemical performance of supercapacitors. To further improve the performance of binary composites, it is a relatively simple method to increase the components as the "bridge" between the two materials to form the ternary composites. The review mainly introduces the current research progress of supercapacitors with pure carbon nanomaterials and multistage carbon nanostructures (composites) as electrodes. The characteristics and application directions of different pure carbon nanomaterials are introduced in detail. Different ways of multilevel structure (material) composite have their own effects on the development of high-performance supercapacitors. We also highlight the recent advances related to these fields and provide our insight into high-energy supercapacitors.
“… Fig. 6 (a) SEM image of CNF/rGO/PPy nanocomposite electrode [ 73 ]; (b) Specific capacitance of CNF/rGO/PPy based supercapacitor [ 73 ]; (c) SEM image of NC/MnO2 nanocomposite electrode [ 89 ]; and (d) Capacity retention of NC/MnO 2 based supercapacitor [ 89 ]. …”
Section: Cellulose-based Bionanocomposites For Supercapacitormentioning
“…However, the current 2D BCN nanosheets usually exhibit self-restacking and aggregation between adjacent nanosheets because of the strong van der Waals interactions, which impedes the ion transport and decreases the number of active sites in MSCs similar to the behavior of 2D graphene. , To overcome these problems, changing the electrode material into a three-dimensional (3D) structure should be an effective strategy to boost the ability of ion transport. For example, previous researchers fabricated materials with a 3D microporous sphere structure as an electrode material, which effectively limited the self-stacking of materials and provided additional electrochemically active sites in SCs. − Therefore, this is an effective strategy for the fabrication of microspheres as electrode materials to prevent the self-stacking of BCN materials and increase the energy storage capability of SCs. In addition, 3D-BCN microspheres can remarkably improve the specific surface area compared with 2D BCN nanosheets, which can provide additional space to accelerate ion transport and increase the number of active sites accordingly.…”
Scalable and cost-effective fabrication of threedimensional (3D) boron carbon nitride (BCN) microspheres was first demonstrated by hydrothermal and annealing methods. In particular, the specific surface area of 3D-BCN-4 reached 1390.12 m 2 g −1 and had a high hierarchical pore structure. An all-printed solid-state flexible microsupercapacitor (MSC) based on 3D-BCN-4 microspheres as an electrode material was fabricated for the first time by a screen printing method, which also provided efficacious properties. The single MSC areal capacitance reached 41.6 mF cm −2 . Furthermore, the remarkable mechanical flexibility was also achieved for the device with evidence that no obvious capacitance loss occurred even upon bending to 180°, and the device had a 93.3% capacitance retention after 1000 cycles. In addition, the maximum energy density reached 0.00832 mW h cm −2 , and the highest power density was 2 mW cm −2 . These results show the synthesis of 3D-BCN by a facile and effective method with excellent electrochemical performance, which should provide a promising direction to wearable energy storage devices.
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