Synthesis of hollow ZnCo2O4 microspheres with enhanced electrochemical performance for asymmetric supercapacitor

Shang, Yuanyuan; Xie, Tian; Ma, Chuanli; L, Su; Gai, Yansong; Liu, Jing; Gong, L.

doi:10.1016/j.electacta.2018.08.025

Cited by 89 publications

(31 citation statements)

References 51 publications

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“…Guo et al prepared Co 2 CuS 4 on graphene nanosheets, which exhibited C sp of 1,005 F·g −1 at 1A·g −1 . In addition, designing nanostructures with large surface areas is important for promoting ion transport in electrochemical processes Shang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Xie

Wang

et al. 2020

Front. Chem.

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A facile hydrothermal approach was adopted to the direct synthesis of bimetallic sulfide (CuCo 2 S 4 ) on carbon cloth (CC) without binders for the supercapacitor's electrodes. A possible formation mechanism was proposed. The prepared bimetallic electrode exhibited a high specific capacitance (Csp) of 1,312 F·g −1 at 1 A·g −1 , and an excellent capacitance retention of 94% at 5 A·g −1 over 5,000 cycles. In addition, the asymmetric supercapacitor (CuCo 2 S 4 /CC//AC/CC) exhibited energy density (42.9 wh·kg −1 at 0.8 kW·kg −1 ) and outstanding cycle performance (80% initial capacity retention after 5,000 cycles at 10 A·g −1 ). It should be noted that the electrochemical performance of a supercapacitor device is quite stable at different bending angles. Two charged devices in series can light 28 red-colored LEDs (2.0 V) for 5 min. All of this serves to indicate the potentially high application value of CuCo 2 S 4 .

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Section: Introductionmentioning

confidence: 99%

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Xie

Wang

et al. 2020

Front. Chem.

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“…In addition, it can be seen in Figure c that the capacitance of CNCO‐3 can still be retained as the largest one from NiCo 2 O 4 and CDs/NiCo 2 O 4 samples, although the specific capacitance of all the samples decreases when the current density is increased from 1 to 10 A g −1 , demonstrating a preferably capacitance retention and low polarization of the NiCo 2 O 4 electrode materials . As shown in Figure S11 (Supporting Information), it is noted that the CDs/NiCo 2 O 4 samples show the rather symmetrical charge–discharge curves, which are mainly due to Faradic redox reaction between CDs/NiCo 2 O 4 electrode and Na 2 SO 4 electrolyte . These results prove that the decoration of CDs on NiCo 2 O 4 nanowires can significantly improve the electrochemical performance of NiCo 2 O 4 electrodes for supercapacitor applications.…”

Section: Resultsmentioning

confidence: 83%

Highly Hydrophilic Carbon Dots' Decoration on NiCo₂O₄ Nanowires for Greatly Increased Electric Conductivity, Supercapacitance, and Energy Density

Wang

Fang

Tian

et al. 2019

Adv Materials Inter

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The design and exploration of the transition metal oxides (TMOs)–carbon composite are greatly desired for enhanced supercapacitor application due to the low hydrophilicity and electrical conductivity of the prime TMOs. In this work, the highly hydrophilic carbon dots (CDs) with an average size of 2.56 nm are synthesized by a microwave thermolysis method, and then used as a decoration agent on the surface of NiCo2O4 nanowires. The CDs‐decorated NiCo2O4 (CDs/NiCo2O4) with a high surface area of 120.0 m2 g−1 is prepared via a one‐pot hydrothermal method and subsequent annealing. Only a small amount of CDs' decoration not only makes the surface more hydrophilic and easier for aqueous electrolyte infiltration into electrode, but can also promote the electrical conductivity of the as‐synthesized CDs/NiCo2O4 to 30‐fold higher than the prime NiCo2O4, and greatly decrease the internal resistance of the electrode material. Therefore, the CDs/NiCo2O4‐based three‐electrode system shows an extremely high specific capacitance (2202 F g−1) while a symmetrical CDs/NiCo2O4 supercapacitor offers a desirable energy density up to 73.5 Wh kg−1. This work provides a new strategy to improve supercapacitance as well as energy density of TMO‐based electrodes via a convenient surface decoration method by using carbon nanomaterials.

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“…These observations indicate that heterometallic ZnO$Co 3 O 4 exhibited a much higher specic capacitance than did a monometallic Co 3 O 4 nanocrystal, which could be attributed presumably to the mesoporous structure and higher surface area that allow fast ion diffusion and better conductivity as a result of ZnO incorporation into the Co 3 O 4 structure. 33…”

Section: Paramagnetic Character Evaluation Of Nanoparticle Co 3 Omentioning

confidence: 99%

Synthesis of homo- and hetero-metallic cobalt and zinc nano oxide particles by a calcination process using coordination compounds: their characterization, DFT calculations and capacitance behavioural study

et al. 2020

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Synthesis of hollow ZnCo2O4 microspheres with enhanced electrochemical performance for asymmetric supercapacitor

Cited by 89 publications

References 51 publications

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Highly Hydrophilic Carbon Dots' Decoration on NiCo₂O₄ Nanowires for Greatly Increased Electric Conductivity, Supercapacitance, and Energy Density

Synthesis of homo- and hetero-metallic cobalt and zinc nano oxide particles by a calcination process using coordination compounds: their characterization, DFT calculations and capacitance behavioural study

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Synthesis of hollow ZnCo2O4 microspheres with enhanced electrochemical performance for asymmetric supercapacitor

Cited by 89 publications

References 51 publications

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Freestanding Needle Flower Structure CuCo2S4 on Carbon Cloth for Flexible High Energy Supercapacitors With the Gel Electrolyte

Highly Hydrophilic Carbon Dots' Decoration on NiCo2O4 Nanowires for Greatly Increased Electric Conductivity, Supercapacitance, and Energy Density

Synthesis of homo- and hetero-metallic cobalt and zinc nano oxide particles by a calcination process using coordination compounds: their characterization, DFT calculations and capacitance behavioural study

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Highly Hydrophilic Carbon Dots' Decoration on NiCo₂O₄ Nanowires for Greatly Increased Electric Conductivity, Supercapacitance, and Energy Density