Co3O4-doped two-dimensional carbon nanosheet as an electrode material for high-performance asymmetric supercapacitors

Yang, Xueying; Cai, Chenglong; Zou, Yongjin; Xiang, Cuili; Chu, Hailiang; Yan, Erhu; Qiu, Shujun; Sun, Lin; Xu, Fen; Hu, Xiaoyun

doi:10.1016/j.electacta.2020.135611

Cited by 38 publications

(14 citation statements)

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“…[32][33][34][35] Electronic, physical and chemical characteristics of TMOs-based materials can be significantly improved by doping with an appropriate metallic element. [30][31][32] Recently, Huiyu Chen et al 13 reported that Mn-doped Co 3 O 4 delivers improved specific capacitance, that is, 773 F/g and excellent capacitance retention. Similarly, Shanshan Li et al 3 have reported improved electrochemical properties of Co 3 O 4 by doping with "Fe" atom, resulting in increased specific capacitance and high capacitance retention.…”

Section: Introductionmentioning

confidence: 99%

“…A large number of TMOs based materials including CeO 2, 9 MnO 2, 10 NiO, 11 Fe 2 O 3 12 and Co 3 O 4 are being used for supercapacitor applications. 13 Among of these TMOs-based materials, Co 3 O 4 is cost-effective, environmental-friendly and offers large theoretical specific capacitance of 3560 F/g. 14,15 This material (cobalt oxide) can exist in three forms known as cobaltosic oxide (Co 3 O 4 ), cobaltic oxide (Co 2 O 3 ) and cobaltous oxide (CoO).…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

et al. 2020

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Summary In this work, cerium was doped in various concentrations ranging from 1.0 to 7.0 at. % by means of a facile hydrothermal synthesis route with an intention to improve the capacitive properties of Co3O4. X‐ray powder diffraction (XRD), scanning electron microscopy coupled with energy dispersive X‐ray spectroscopy (EDX) and HRTEM were employed to study the structural characteristics, morphology, elemental constitution and d‐spacing of the synthesized material. The capacitive characteristics were analyzed through cyclic voltammetry (CV), galvanostatic charge‐discharge (GCD) test and electrochemical impedance spectroscopy (EIS). Materials characterizations revealed the formation of pristine and Ce‐doped Co3O4 nanoflakes, and their average size was in the range of 45 to 55 nm and possessing excellent elemental purity. The CV test showed that 5.0 at. % Ce‐doped Co3O4 nanoflakes deliver outstanding specific capacitance, that is, 1309.6 F/g and excellent cyclic stability of 90.86% after 2000 CV cycles at a scan rate 5 mV/s. The GCD test at 1‐10 A/g showed excellent rate capability, that is, 82.87% at high current density of 10 A/g. The EIS test revealed excellent electrical conductivity of the material. Experimental results suggest that Ce‐doped Co3O4 has an outstanding potential for use in energy storage devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

et al. 2020

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“…To solve these challenges, TMCs are usually composited with carbon skeletons, which can not only construct effective electrons/ions transfer channels, but also sustain the structural stability of the entire electrode. In recent years, carbon skeletons with various dimensions (0, 1, 2, or 3 D) have been successfully designed and introduced into the TMCs composite [23,[26][27][28] (Fig. 2).…”

Section: Conductive Carbon Skeletonsmentioning

confidence: 99%

Recent Developments of Transition Metal Compounds-Carbon Hybrid Electrodes for High Energy/Power Supercapacitors

et al. 2021

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Due to their rapid power delivery, fast charging, and long cycle life, supercapacitors have become an important energy storage technology recently. However, to meet the continuously increasing demands in the fields of portable electronics, transportation, and future robotic technologies, supercapacitors with higher energy densities without sacrificing high power densities and cycle stabilities are still challenged. Transition metal compounds (TMCs) possessing high theoretical capacitance are always used as electrode materials to improve the energy densities of supercapacitors. However, the power densities and cycle lives of such TMCs-based electrodes are still inferior due to their low intrinsic conductivity and large volume expansion during the charge/discharge process, which greatly impede their large-scale applications. Most recently, the ideal integrating of TMCs and conductive carbon skeletons is considered as an effective solution to solve the above challenges. Herein, we summarize the recent developments of TMCs/carbon hybrid electrodes which exhibit both high energy/power densities from the aspects of structural design strategies, including conductive carbon skeleton, interface engineering, and electronic structure. Furthermore, the remaining challenges and future perspectives are also highlighted so as to provide strategies for the high energy/power TMCs/carbon-based supercapacitors.

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“…[2] Recent research and developments have focused on the new materials and synthesis techniques in SCs to improve their energy densities to some extent comparable to batteries. [11][12][13][14][15][16] SCs have mainly divided into three main categories: i) electrical double-layer capacitors (EDLCs), ii) pseudocapacitors, and iii) hybrid capacitors. EDLCs provide longer cycle life due to the presence of physical charge transfer mechanisms, while pseudocapacitors obtain higher energy densities because of the involvement of faradaic redox reactions.…”

Section: Introductionmentioning

confidence: 99%

“…However, the energy densities of SCs are lower than those of batteries and fuel cells [2] . Recent research and developments have focused on the new materials and synthesis techniques in SCs to improve their energy densities to some extent comparable to batteries [11–16] …”

Section: Introductionmentioning

confidence: 99%

Highly Flexible and Tailorable Cobalt‐Doped Cross‐Linked Polyacrylamide‐Based Electrolytes for Use in High‐Performance Supercapacitors

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Qahtan

Çevik

et al. 2021

Chemistry An Asian Journal

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A novel hydrogel polymer electrolyte was prepared by incorporation of 1,4-butanediol diglycidyl ether (BG) to cross-linked polyacrylamide (PAM). The electrolyte (PAMBG) was modified with cobalt (II) sulfate with various doping ratios (PAMBGCoX) to increase the capacitance by increasing faradaic reactions. The supercapacitor device assembly was performed by using active carbon (AC) electrodes and hydrogel polymer electrolytes. The specific capacitance of the PAMBGCo5 device indicated 130 F g À 1 , which is at least a seven-fold improvement due to the insertion of Co as a redox component. The electrolyte device, PAMBGCo5, displays superior performance having an energy density of 38 Wh kg À 1 at a power density of 500 W kg À 1 . Additionally, with the same hydrogel, the device performed 10,000 galvanostatic chargedischarge cycles via retaining 91% of the initial capacitance. A cost-effective electrolyte, PAMBGCo5, was tested in a carbon-based supercapacitor under bent and twisted conditions at various angles, confirming the robustness of the device.

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Co3O4-doped two-dimensional carbon nanosheet as an electrode material for high-performance asymmetric supercapacitors

Cited by 38 publications

References 50 publications

Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

Recent Developments of Transition Metal Compounds-Carbon Hybrid Electrodes for High Energy/Power Supercapacitors

Highly Flexible and Tailorable Cobalt‐Doped Cross‐Linked Polyacrylamide‐Based Electrolytes for Use in High‐Performance Supercapacitors

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Co3O4-doped two-dimensional carbon nanosheet as an electrode material for high-performance asymmetric supercapacitors

Cited by 38 publications

References 50 publications

Hydrothermal synthesis of cerium‐doped Co 3 O 4 nanoflakes as electrode for supercapacitor application

Hydrothermal synthesis of cerium‐doped Co 3 O 4 nanoflakes as electrode for supercapacitor application

Recent Developments of Transition Metal Compounds-Carbon Hybrid Electrodes for High Energy/Power Supercapacitors

Highly Flexible and Tailorable Cobalt‐Doped Cross‐Linked Polyacrylamide‐Based Electrolytes for Use in High‐Performance Supercapacitors

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Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application