Mesoscale Morphological Control of Electrodeposited Manganese Dioxide Films

Gibson, Andrew; Burns, Robert C.; Dupont, Madeleine; Donne, Scott W.

doi:10.1016/j.electacta.2015.04.036

Cited by 8 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…15,16 SPECS also has been used successfully for characterising the performance of electrochemical capacitor materials with different materials such as activated carbon and manganese dioxide. [17][18][19][20][21][22] Figure 1 shows a comparison between the current-time plots for a CV experiment at a sweep rate of 25 mV/s and a SPECS experiment with 25 mV potential steps and a 300 s equilibration time, with each applied potential profile superimposed. In both methods, the potential was gradually increased from the initial potential up to the maximum vertex potential of the electrochemical window.…”

Section: Cyclic Voltammetry and Step Potential Electrochemical Spectr...mentioning

confidence: 99%

Method Comparison for Deconvoluting Capacitive and Pseudo-Capacitive Contributions to Electrochemical Capacitor Electrode Behavior

Forghani

Donne

2018

J. Electrochem. Soc.

Self Cite

244

123

View full text Add to dashboard Cite

Several electrochemical methods have been developed to determine the contribution of different charge storage mechanisms, such as via the electrical double layer and diffusion-limited processes, to electrochemical capacitor behavior. This includes using cyclic voltammetry (CV) data at different sweep rates to obtain the relationship between voltammetric current and sweep rate, and also the relationship between voltammetric charge and sweep rate.Step potential electrochemical spectroscopy (SPECS) also has been used to effectively differentiate between different charge storage mechanisms. Herein we compare these three methods experimentally and also discuss their advantages and limitations toward differentiating between different charge storage mechanisms. These methods have been applied to electrolytic manganese dioxide (EMD) in 0.5 M K 2 SO 4 between 0.0-0.8 V (vs SCE). It was found that in all cases, the specific capacitance was decreased by increasing the sweep rate. The capacitance-sweep rate dependence was only found to be accurate in a short range of low sweep rates. Overall there was good agreement between the SPECS and current-sweep rate dependence models over the full range of sweep rates. However, the SPECS method provided more precise information about the kinetic behavior of the electrochemical cell through a full range of sweep rates.

show abstract

Section: Cyclic Voltammetry and Step Potential Electrochemical Spectr...mentioning

confidence: 99%

Method Comparison for Deconvoluting Capacitive and Pseudo-Capacitive Contributions to Electrochemical Capacitor Electrode Behavior

Forghani

Donne

2018

J. Electrochem. Soc.

Self Cite

244

123

View full text Add to dashboard Cite

show abstract

“…However, a purely capacitive wave current response was observed. This poor electrochemical response is likely due to a decrease in the electrolyte access to the film, as well as an increase in the electronic resistance [ 66 ]. Upon cycling, the peak current slightly increases to reach its maximum by the 70th cycle and drops again as seen in the 100th cycle.…”

Section: Resultsmentioning

confidence: 99%

Electrolytic Manganese Dioxide Coatings on High Aspect Ratio Micro-Pillar Arrays for 3D Thin Film Lithium Ion Batteries

et al. 2017

View full text Add to dashboard Cite

In this work, we present the electrochemical deposition of manganese dioxide (MnO2) thin films on carbon-coated TiN/Si micro-pillars. The carbon buffer layer, grown by plasma enhanced chemical vapor deposition (PECVD), is used as a protective coating for the underlying TiN current collector from oxidation, during the film deposition, while improving the electrical conductivity of the stack. A conformal electrolytic MnO2 (EMD) coating is successfully achieved on high aspect ratio C/TiN/Si pillar arrays by tailoring the deposition process. Lithiation/Delithiation cycling tests have been performed. Reversible insertion and extraction of Li+ through EMD structure are observed. The fabricated stack is thus considered as a good candidate not only for 3D micorbatteries but also for other energy storage applications.

show abstract

“…More importantly, it allows for the separation of charge storage mechanisms, such as via electrical double layer charge storage and pseudo-capacitive (specifically diffusional) processes. 18,19,[28][29][30][31] Immediately after a potential step the current reaches its maximum value, but it then decays away relatively quickly to approach a quasiequilibrium value. Ideally this should be zero current; however, the relatively slow kinetics of charge transfer and mass transport, together with inherent electrode instabilities dictate that most often it is a nonzero current.…”

Section: Analysis and Deconvolution Of Specs Data-mentioning

confidence: 99%

“…More importantly, it allows separation of charge storage mechanisms, such as via electrical double layer charge storage and diffusional processes. 18,19,[28][29][30][31] The SPECS data can be modelled, using combined resistance, double layer, diffusional and residual currents, to separate different charge storage mechanisms. Thus, the SPECS method can provide fundamental information about material and system behavior such as kinetics, ESR, diffusional processes, double layer capacitance, fast and slow processes, and also infer electrode instabilities from the residual current.…”

mentioning

confidence: 99%

Duty Cycle Effects on the Step Potential Electrochemical Spectroscopy (SPECS) Analysis of the Aqueous Manganese Dioxide Electrode

Donne¹

2018

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

Step potential electrochemical spectroscopy (SPECS) has previously been demonstrated as an effective method for deconvoluting charge storage processes in electrochemical capacitor materials. Herewith is described the effect of the two main experimental variables in SPECS; namely the potential step size and the electrode rest time, on the behavior of the aqueous manganese dioxide electrode. The potential step size dictates polarization at the electrode-electrolyte interface, and hence the driving force for charge storage, while the electrode rest time effects the extent to which the electrode has equilibrated before the subsequent potential step. The extent to which these experimental variables influence geometric and porous double layer formation, as well as diffusional and residual electrode processes, in the manganese dioxide electrode have been described and explained based on the current physical understanding of this electrode system. Furthermore, functional relationships were also established between the diffusional capacitance and the inverse square root of the scan rate (v −1/2 ), as well as the residual capacitance and the inverse of the scan rate (v −1 ).

show abstract

Mesoscale Morphological Control of Electrodeposited Manganese Dioxide Films

Cited by 8 publications

References 20 publications

Method Comparison for Deconvoluting Capacitive and Pseudo-Capacitive Contributions to Electrochemical Capacitor Electrode Behavior

Method Comparison for Deconvoluting Capacitive and Pseudo-Capacitive Contributions to Electrochemical Capacitor Electrode Behavior

Electrolytic Manganese Dioxide Coatings on High Aspect Ratio Micro-Pillar Arrays for 3D Thin Film Lithium Ion Batteries

Duty Cycle Effects on the Step Potential Electrochemical Spectroscopy (SPECS) Analysis of the Aqueous Manganese Dioxide Electrode

Contact Info

Product

Resources

About