Plasma-assisted lattice oxygen vacancies engineering recipe for high-performing supercapacitors in a model of birnessite-MnO2

Peng, Chi; Zhang, Yaxiong; Cao, Zhen; Liu, Yupeng; Sun, Zhenheng; Cheng, Situo; Wu, Yin; Fu, Jiecai; Xie, Erqing

doi:10.1016/j.cej.2021.128676

Cited by 58 publications

(25 citation statements)

References 60 publications

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“…Later, with the increase of scan rate, the contribution of the diffusion control capacitance decreases gradually. This is because when the scan rate is faster, electrolyte ions can react faster only on the surface, and there is no time to enter the interior of the material for reaction …”

Section: Resultsmentioning

confidence: 99%

“…This is because when the scan rate is faster, electrolyte ions can react faster only on the surface, and there is no time to enter the interior of the material for reaction. 46 According to the analysis of the influence of Cu doping on the morphology, loading capacity, and electrochemical performance of the compound electrode, it can be seen that the doping reagent metal Cu does have a series of regulatory effects on the reaction system of the original binary metal Ni− Co mixed solution. The main possible regulatory mechanisms are as follows:…”

Section: Resultsmentioning

confidence: 99%

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Construction of Cu-Doped Ni–Co-Based Electrodes for High-Performance Supercapacitor Applications

Zhang

Cheng

et al. 2022

ACS Appl. Energy Mater.

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Element doping is an effective method to improve the specific capacity and ion transfer rate of binary metal compounds. In this study, Cu-doped Ni–Co-based electrode materials were synthesized by a hydrothermal process and subsequent annealing treatment. The experimental results show that the nanocone-like Cu-doped Ni–Co carbonate hydroxides (Ni–Co–Cu CH) with high mass loading and the Cu-doped Ni–Co oxide (Ni–Co–Cu oxide) electrode with abundant oxygen defects achieve high area specific capacities of 6.31 F/cm2 and 6.54 F/cm2 at 3 A/g, respectively, which are about 2.5 times larger than the area specific capacity of the undoped nanorod-like Ni–Co precursor electrode (2.51 F/cm2 at 3 A/g). The quasi-solid-state asymmetric supercapacitors (ASCs) Ni–Co–Cu CH//AC and Ni–Co–Cu oxide//AC also achieved high energy densities of 36.9 Wh/kg and 42.1 Wh/kg at power densities of 374.2 W/kg and 374.9 W/kg, respectively, which can light up a red light emitting didode for ∼8 min and ∼11 min, respectively. Cu doping not only changes the morphology and defect state of a Ni–Co bimetallic compound electrode but also improves its electricity conduction and electrochemical performance. This strategy has important reference significance for the preparation of excellent performance supercapacitor energy storage materials in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Construction of Cu-Doped Ni–Co-Based Electrodes for High-Performance Supercapacitor Applications

Zhang

Cheng

et al. 2022

ACS Appl. Energy Mater.

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“…The formation of positive charge holes was more likely to adsorb cations, thus improving the performance of SCs. Two types of charge storage mechanisms for MnO 2 electrodes have been accepted. ,,, The charge storage mechanisms for MnO 2 were the pseudocapacitive (Faradaic) reactions which involved the surface adsorption or desorption of electrolyte cations (H + , Na + ) on MnO 2 , …”

Section: Resultsmentioning

confidence: 99%

Engineering Oxygen Vacancies on Mixed-Valent Mesoporous α-MnO₂ for High-Performance Asymmetric Supercapacitors

Yin

et al. 2022

Langmuir

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Intrinsically poor conductivity and sluggish ion-transfer kinetics limit the further development of electrochemical storage of mesoporous manganese dioxide. In order to overcome the challenge, defect engineering is an effective way to improve electrochemical capability by regulating electronic configuration at the atomic level of manganese dioxide. Herein, we demonstrate effective construction of defects on mesoporous α-MnO2 through simply controlling the degree of redox reaction process, which could obtain a balance between Mn3+/Mn4+ ratio and oxygen vacancy concentration for efficient supercapacitors. The different structures of α-MnO2 including the morphology, specific surface area, and composition are successfully constructed by tuning the mole ratio of KMnO4 to Na2SO3. The electrode materials of α-MnO2-0.25 with an appropriate Mn3+/Mn4+ ratio and abundant oxygen vacancy showed an outstanding specific capacitance of 324 F g–1 at 0.5 A g–1, beyond most reported MnO2-based materials. The asymmetric supercapacitors formed from α-MnO2-0.25 and activated carbon can present an energy density as high as of 36.33 W h kg–1 at 200 W kg–1 and also exhibited good cycle stability over a wide voltage range from 0 to 2.0 voltage (kept at approximately 98% after 10 000 cycles in galvanostatic cycling tests) and nearly 100% Coulombic efficiency. Our strategy lays a foundation for fine regulation of defects to improve charge-transfer kinetics.

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“…Similar results were reported in many other works, which demonstrated that introduction of defects could promote ion diffusion during the charge/discharge processes. 190,191…”

Section: Promoting Ion Diffusion Kineticsmentioning

confidence: 99%

Defect engineering of electrode materials towards superior reaction kinetics for high-performance supercapacitors

Yan

et al. 2022

J. Mater. Chem. A

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Plasma-assisted lattice oxygen vacancies engineering recipe for high-performing supercapacitors in a model of birnessite-MnO2

Cited by 58 publications

References 60 publications

Construction of Cu-Doped Ni–Co-Based Electrodes for High-Performance Supercapacitor Applications

Construction of Cu-Doped Ni–Co-Based Electrodes for High-Performance Supercapacitor Applications

Engineering Oxygen Vacancies on Mixed-Valent Mesoporous α-MnO₂ for High-Performance Asymmetric Supercapacitors

Defect engineering of electrode materials towards superior reaction kinetics for high-performance supercapacitors

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Plasma-assisted lattice oxygen vacancies engineering recipe for high-performing supercapacitors in a model of birnessite-MnO2

Cited by 58 publications

References 60 publications

Construction of Cu-Doped Ni–Co-Based Electrodes for High-Performance Supercapacitor Applications

Construction of Cu-Doped Ni–Co-Based Electrodes for High-Performance Supercapacitor Applications

Engineering Oxygen Vacancies on Mixed-Valent Mesoporous α-MnO2 for High-Performance Asymmetric Supercapacitors

Defect engineering of electrode materials towards superior reaction kinetics for high-performance supercapacitors

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Product

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Engineering Oxygen Vacancies on Mixed-Valent Mesoporous α-MnO₂ for High-Performance Asymmetric Supercapacitors