Electrochemical response of a high-power asymmetric supercapacitor based on tailored MnOx/Ni foam and carbon cloth in neutral and alkaline electrolytes

Aldama, I.; Siwek, Katarzyna; Amarilla, José Manuel; Rojo, J. M.; Eugénio, S.; Silva, T.M.; Montemor, M.F.

doi:10.1016/j.est.2019.02.025

Cited by 23 publications

(6 citation statements)

References 76 publications

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“…However, the R ct of the composite in Na 2 SO 4 is smaller than that in KOH (0.33 Ω vs 0.60 Ω). It may be because Na 2 SO 4 solution contains more carriers (2 M Na + vs 1 M K + ), which can promote the charge transfer …”

Section: Resultsmentioning

confidence: 99%

“…It may be because Na 2 SO 4 solution contains more carriers (2 M Na + vs 1 M K + ), which can promote the charge transfer. 35 In order to compare the effects of two electrolytes on MnO 2 /CC more intuitively, some important parameters of the materials were drawn into a radar image (Figure 7). This figure shows not only the advantages of materials in any parameters but also the comprehensive performance of the sample according to the closed area.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Performance of an Asymmetric Coin Cell Supercapacitor Based on Marshmallow-like MnO₂/Carbon Cloth in Neutral and Alkaline Electrolytes

et al. 2021

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As a new energy-storage device, a supercapacitor has attracted great attention, but its low power density limits its wide application. The key to develop high-performance supercapacitors is to find high-performance electrode materials and design reasonable structures. Here, based on the strategy of structure construction and flexible self-growth, a simple one-step hydrothermal method was used to prepare marshmallow-like MnO2/CC electrode material. The electrochemical properties of the composite in different electrolytes (neutral and alkaline electrolyte) were investigated. This electrode material has excellent electrochemical characteristics in a Na2SO4 electrolyte, with a specific areal capacitance of MnO2/CC of 624 mF cm–2 and an excellent cycle performance (97.7% after 2000 cycles). As a comparison, the electrode displays higher specific capacitance (1092 mF cm–2) and poor cycle performance (49.5%) in KOH. An asymmetric coin cell supercapacitor (ACC) device was assembled using MnO2/CC as a positive electrode, active carbon as a negative electrode, and Na2SO4 as the electrolyte. The device shows good specific capacitance (67.8 F g–1) and stable cycle stability (97.3%), superior to many reported supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Electrochemical Performance of an Asymmetric Coin Cell Supercapacitor Based on Marshmallow-like MnO₂/Carbon Cloth in Neutral and Alkaline Electrolytes

et al. 2021

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“…Aqueous alkali metal-ion (Na + , K + )- and zinc-ion (Zn 2+ )-based redox reactions are the most promising chemistries for stationary energy-storage application, and the aqueous zinc-ion battery (AZIB) is particularly appealing due to its high theoretical specific capacity (820 mAh g –1 ), , low price, good air stability, and appropriate Zn 2+ /Zn voltage (−0.76 V vs H + /H 2 ) of the Zn anode . As the key component, cathode materials of the AZIB mainly include Mn/V/Co-based oxides, hexacyanoferrates, and organics, and among them, Mn-based oxides show one of the highest energy densities. − From the previous study on MnO 2 nanowires, the addition of MnSO 4 into the electrolyte significantly improves the cycling stability and the rate capability . However, the capacity delivery still needs further lucubration.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Ion Conduction via Epitaxially Polymerized Two-Dimensional Conducting Polymer for High-Performance Cathode in Zinc-Ion Batteries

Zang

Wang

Liu

et al. 2020

ACS Appl. Mater. Interfaces

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Aqueous zinc-ion batteries (AZIBs) are one of the promising choices for the future large-scale grid energy storage, in which Mn-based cathode materials have the advantages of low cost and environmental friendliness. However, their capacity delivery and cycling stability are limited by the large bulk-induced incomplete zincation and structure pulverization. Here, we develop a strategy of epitaxial polymerization in the liquid phase to fabricate two-dimensional (2D) MnO x /polypyrrole nanosheets to enhance the zinc-ion storage by realizing the efficient utilization of active materials and improving the structural stability via a polymerized framework. An ultrahigh capacity of 408 mAh g −1 is demonstrated at 1C rate, and an excellent capacity retention of 78% is realized after 2800 cycles at 5C rate for the AZIB. Electrochemical and morphological characterizations reveal that the unique 2D structure contributes to both the electron/ion conductivity and structural stability. The epitaxial polymerization of the conducting polymer in the liquid phase provides a new perspective to the synthesis of high-performance electrode materials and 2D conducting polymers.

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“…C 4 H 6 O 4 Zn, C 2 H 3 O 2 NH 4 , and NaBr are used to prepare porous zinc. NH4+ functions as the source of H according to former studies (Shin et al, 2003; Shin and Liu, 2004; Li et al, 2007; Cherevko and Chung, 2010; Aldama et al, 2019; Qiu et al, 2019), the function of C 2 H 3 O2- is to decrease the size of pores, and NaBr is introduced to strengthen the conductivity of solutions. Detailed physicochemical characterizations reveal that porous zinc with unique foam structure is successfully fabricated using the dynamic gas template assisted electrodepositon approach.…”

Section: Introductionmentioning

confidence: 99%

Porous Zinc Anode Design for Zn-air Chemistry

Liu¹,

Ling²,

Zhong³

et al. 2019

Front. Chem.

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Zinc-air battery has drawn increasing attention from the whole world owing to its large energy capacity, stable working voltage, environmentally friendship, and low price. A special porous Zn with three-dimensional (3D) network frame structure, whose multistage average pore sizes can be tuned from 300 to 8 um, is synthesized in this work. It is found that there is a competition between Zn2+ and NH4+ for their reduction on the supports. And the decrease of Zn2+ concentration and increase of NH4+ concentration can facilitate the decrease of pore size. Potential-dynamic polarization was tested with 3-electrodes cell, aiming to characterize the electrochemical activity and corrosion properties of porous Zn and commercial Zn foil electrodes. After optimization, the porous Zn prepared with the parameters of 3 M NaBr, 1 M C2H3O2NH4, and 0.01 M C4H6O4Zn shows the most negative corrosion potential of −1.45 V among all the samples, indicating the remarkable anti-corrosion property. Its discharge specific capacity is up to 812 mAh g−1. And discharge-charge test of the porous Zn shows an initial discharge platform of 1.33 V and an initial charge platform of 1.96 V, performing a small overpotential. What's more, the porous Zn exhibits a much longer cycle life than commercial Zn foil. Our work will not only shed light on the design and synthesis of other porous metal materials, but also further promote the development of Zn-based battery electrochemistry.

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Electrochemical response of a high-power asymmetric supercapacitor based on tailored MnOx/Ni foam and carbon cloth in neutral and alkaline electrolytes

Cited by 23 publications

References 76 publications

Electrochemical Performance of an Asymmetric Coin Cell Supercapacitor Based on Marshmallow-like MnO₂/Carbon Cloth in Neutral and Alkaline Electrolytes

Electrochemical Performance of an Asymmetric Coin Cell Supercapacitor Based on Marshmallow-like MnO₂/Carbon Cloth in Neutral and Alkaline Electrolytes

Enhanced Ion Conduction via Epitaxially Polymerized Two-Dimensional Conducting Polymer for High-Performance Cathode in Zinc-Ion Batteries

Porous Zinc Anode Design for Zn-air Chemistry

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Electrochemical response of a high-power asymmetric supercapacitor based on tailored MnOx/Ni foam and carbon cloth in neutral and alkaline electrolytes

Cited by 23 publications

References 76 publications

Electrochemical Performance of an Asymmetric Coin Cell Supercapacitor Based on Marshmallow-like MnO2/Carbon Cloth in Neutral and Alkaline Electrolytes

Electrochemical Performance of an Asymmetric Coin Cell Supercapacitor Based on Marshmallow-like MnO2/Carbon Cloth in Neutral and Alkaline Electrolytes

Enhanced Ion Conduction via Epitaxially Polymerized Two-Dimensional Conducting Polymer for High-Performance Cathode in Zinc-Ion Batteries

Porous Zinc Anode Design for Zn-air Chemistry

Contact Info

Product

Resources

About

Electrochemical Performance of an Asymmetric Coin Cell Supercapacitor Based on Marshmallow-like MnO₂/Carbon Cloth in Neutral and Alkaline Electrolytes

Electrochemical Performance of an Asymmetric Coin Cell Supercapacitor Based on Marshmallow-like MnO₂/Carbon Cloth in Neutral and Alkaline Electrolytes