In situ crystallographic investigations of charge storage mechanisms in MnO2-based electrochemical capacitors

Ghodbane, Ouassim; Ataherian, Fatemeh; Wu, Nae‐Lih; Favier, Frèdéric

doi:10.1016/j.jpowsour.2012.01.103

Cited by 128 publications

(96 citation statements)

References 36 publications

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“…S7). The simplest explanation for this observation is that the positively charged ions incorporated in Ti 3 C 2 T x increase the electrostatic attraction between layers, in a manner analogous to what is observed for MnO 2 (19). When Ti 3 C 2 T x was electrochemically cycled in a MgSO 4 -containing solution, the shift of the (0002) peak almost doubled relative to the KOH and NaOAc electrolytes (compare Fig.…”

mentioning

confidence: 71%

Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide

Lukatskaya

Mashtalir

Ren

et al. 2013

Science

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confidence: 71%

Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide

Lukatskaya

Mashtalir

Ren

et al. 2013

Science

3,718

2,672

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“…48 For the one-dimensional (1D) MnO 2 powders, the capacitance values were found to increase in the following order: pyrolusite (28 F.g −1 ) < Ni-todorokite (42 F.g −1 ) < ramsdellite (87 F.g −1 ) < cryptomelane (125 F.g −1 ) < OMS-5 (217 F.g −1 ). 49 Thus, the larger channel size leads to the greater capacitance value.…”

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confidence: 98%

Microstructural and Morphological Effects on Charge Storage Properties in MnO₂-Carbon Nanofibers Based Supercapacitors

Ghodbane¹,

Louro

Coustan

et al. 2013

J. Electrochem. Soc.

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“…z E-mail: nlw001@ntu.edu.tw evolution of several MnO 2 polymorphs during the course of electrochemical charge/discharge 17 and have identified different cell swelling/contraction behaviors related to their crystal structures. This study examined the elevated-temperature (50…”

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confidence: 99%

Investigating Mechanisms Underlying Elevated-Temperature-Induced Capacity Fading of Aqueous MnO₂Polymorph Supercapacitors: Cryptomelane and Birnessite

Pan

Ghodbane

Weng

et al. 2015

J. Electrochem. Soc.

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The effects of elevated operating temperature on the charge-storage capacity fading of two MnO 2 polymorph pseudocapacitive electrodes, namely cryptomelane and birnessite, in an aqueous K 2 SO 4 electrolyte were investigated. These two polymorphs have been shown to exhibit markedly different volume expansion and contraction behaviors during cycling. An increase in the cycling temperature from 25 to 50 • C dramatically increased the fading rate for both the electrodes, but the underlying mechanisms were different. For the cryptomelane electrode, in which the MnO 2 structure exhibits negligible volume variations during cycling, an increase in the operating temperature increased the irreversible structural distortion that originated from the Jahn-Teller distortion of MnO 6 octahedra. The structural distortion hindered the redox reactions involving K + intercalation into the MnO 2 lattice and led to a significant increase in charge-transfer resistance at the solid-electrolyte interface, thus accelerating capacity fading. For the birnessite electrode, cycling produced a marked increase in the electrical resistivity of active layer. This resistivity increase is attributable to the large cyclic volume variations in the birnessite structure, which cause debonding of binder with the constituent particles of the electrode. Accelerated capacity fading resulting from an increased operating temperature is attributed to deteriorating mechanical strength of the binder with increasing temperature. Pseudocapacitive supercapacitors that make use of fast redox reactions of electrochemically active metal oxide materials are attractive energy storage cells. They can deliver substantially higher power densities than rechargeable batteries, while offering significantly greater specific charge-storage capacity than symmetric electric double-layer capacitors.6-8 The practical application of supercapacitors relies heavily on their cycling stability. Commercial supercapacitors are expected to operate over relatively wide temperature ranges (e.g., from −20 to 60• C for advanced commercial carbon-based supercapacitors) in specific environments. The behaviors of pseudocapacitive supercapacitors at extreme temperatures, either well above or below room temperature, are relatively unknown, and related reports are scarce.Since first reported by Goodenough et al., 9,10 MnO 2 has attracted considerable attention as a promising pseudocapacitive supercapacitor electrode material because of its high theoretical specific capacitance (1370 F g −1 for one-electron transfer over a potential range of 1 V), low cost, natural abundance, and environmental friendliness. In addition, the use of aqueous neutral electrolytes in MnO 2 -based supercapacitors provides greater device safety compared with strong acidic electrolytes (e.g., those used in RuO 2 -based supercpactors).11 Previous studies on MnO 2 -based supercapacitors have mainly focused on achieving high specific capacitance; only a few studies [12][13][14] have focused on understanding the mechanisms t...

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In situ crystallographic investigations of charge storage mechanisms in MnO2-based electrochemical capacitors

Cited by 128 publications

References 36 publications

Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide

Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide

Microstructural and Morphological Effects on Charge Storage Properties in MnO₂-Carbon Nanofibers Based Supercapacitors

Investigating Mechanisms Underlying Elevated-Temperature-Induced Capacity Fading of Aqueous MnO₂Polymorph Supercapacitors: Cryptomelane and Birnessite

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In situ crystallographic investigations of charge storage mechanisms in MnO2-based electrochemical capacitors

Cited by 128 publications

References 36 publications

Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide

Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide

Microstructural and Morphological Effects on Charge Storage Properties in MnO2-Carbon Nanofibers Based Supercapacitors

Investigating Mechanisms Underlying Elevated-Temperature-Induced Capacity Fading of Aqueous MnO2Polymorph Supercapacitors: Cryptomelane and Birnessite

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Microstructural and Morphological Effects on Charge Storage Properties in MnO₂-Carbon Nanofibers Based Supercapacitors

Investigating Mechanisms Underlying Elevated-Temperature-Induced Capacity Fading of Aqueous MnO₂Polymorph Supercapacitors: Cryptomelane and Birnessite