Redox-Enhanced Electrochemical Capacitors: Status, Opportunity, and Best Practices for Performance Evaluation

Evanko, Brian; Boettcher, Shannon W.; Yoo, Seung Joon; Stucky, Galen D.

doi:10.1021/acsenergylett.7b00828

Cited by 179 publications

(142 citation statements)

References 60 publications

Supporting

Mentioning

142

Contrasting

Order By: Relevance

“…The activated carbon which serves as the negative electrode material has a specific capacitance of only about 250 F g −1 at a current density of 2 A g −1 . The energy density and power density of the hybrid supercapacitor are calculated according to the equations E = I ∫ V d t and P =3600 E / ▵t , where E is the energy density (W h kg −1 ) and P is the power density (W kg −1 ) . Ragone Plot of the MnCo 2 O 4 @NiMoO 4 //AC hybrid supercapacitor is shown in Figure c.…”

Section: Resultsmentioning

confidence: 99%

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

2018

View full text Add to dashboard Cite

A MnCo2O4@NiMoO4 composite was synthesized on nickel foam by a two‐step method. The composite has a core‐shell structure in which MnCo2O4 nanoneedles are wrapped by NiMoO4 nanoflakes. The MnCo2O4@NiMoO4/Ni foam is applied as a binder‐free electrode for supercapacitors and it achieves a specific capacitance of up to 1718 F g−1 at a current density of 1 A g−1, and 84 % capacitance retention after 6000 charge‐discharge cycles. The capacitance of the MnCo2O4@NiMoO4 composite is much higher than MnCo2O4 nanoneedles and NiMoO4 nanoflakes alone. Moreover, a hybrid supercapacitor is assembled by applying the MnCo2O4@NiMoO4/Ni foam as the positive electrode, activated carbon/Ni foam as the negative electrode. The hybrid supercapacitor reaches an energy density of up to 42.3 W h kg−1 at a power density of 797 W kg−1, a power density of 6256 W kg−1 at an energy density of 17.4 W h kg−1, and 86 % capacitance retention after 2000 charge‐discharge cycles. The results suggest that the rational design of electrode materials with such structure and composition is an effective strategy to improve electrochemical performance.

show abstract

Section: Resultsmentioning

confidence: 99%

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

2018

View full text Add to dashboard Cite

show abstract

“…For the two‐electrode configurations, the special capacitance ( Cs, F g −1 ), energy density ( E , kW kg −1 ), and power density ( P , Wh kg −1 ) can be calculated by GCD curves, which was examined by the following equations [Eqs. (4)–]:

true normalC_{s} = \frac{2 I \int V d t}{m {Δ V}^{2}}

true normalE = \frac{1}{2} normalC_{s} {Δ V}^{2}

true normalP = \frac{E}{Δ t}

…”

Section: Methodsmentioning

confidence: 99%

Designing Core‐Shell Ni(OH)₂@CuO Nanowire Arrays on 3D Copper Foams for High‐Performance Asymmetric Supercapacitors

Zhang

et al. 2019

ChemElectroChem

View full text Add to dashboard Cite

Core-shell Ni(OH) 2 @CuO electrodes grown on three-dimensional copper foams were synthesized by a facile thermal oxidation and chemical bath deposition method. The electrochemical experiments present that the Ni(OH) 2 @CuO electrode delivers large areal capacitance (1.625 F cm À 2 at 3 mA cm À 2 ), excellent rate capacity (1.285 F cm À 2 at 30 mA cm À 2 ), and brilliant cycling stability (retaining 96.4 % after 5000 cycles). In addition, an asymmetric supercapacitor (ASC) device was designed taking Ni (OH) 2 @CuO electrode and active carbon (AC) as a positive and negative electrode, respectively. The ACS device exhibits a high voltage of 1.6 V and remarkable energy density up to 58.59 Wh kg À 1 at a power density of 686.45 W kg À 1 . This work may serve to develop new areas of low-cost materials for energy storage and conversion system.

show abstract

“…The high energy density of pseudocapacitive materials and the high power density of carbon materials in liquid electrolytes gave rise to the idea to develop liquid electrolytes with inherent pseudocapacitance. The emerging redox‐active electrolytes are prepared by dissolving redox mediators in the inert electrolyte, thus endowing the electrolyte with the fascinating ability to store energy . Carbon‐based electrodes are widely used in active electrolytes because of their high surface area, good conductivity, superior stability, excellent chemical inertness, and low cost .…”

Section: Introductionmentioning

confidence: 99%

Redox‐Mediator‐Enhanced Electrochemical Capacitors: Recent Advances and Future Perspectives

Zhai

et al. 2019

ChemSusChem

View full text Add to dashboard Cite

Supercapacitors deliver exceptional power densities, high cycling stability, and inherent safety but suffer from low energy densities. Many methods to enhance the energy density are based on exploring electrode materials with well‐developed structures and designing asymmetric systems with wide voltage windows. The energy density is substantially enhanced at the compromise of power density by utilizing the sluggish kinetics of pseudocapacitive materials. Redox‐active electrolytes can contribute additional pseudocapacitance from the reactions of redox mediators at the interface, which have attracted increasing attention of researchers. Redox‐mediator‐enhanced supercapacitors deliver high energy densities while retaining high power densities. This Minireview highlights the recently prominent progresses of single‐, dual‐, and ambipolar‐redox‐mediator‐enhanced supercapacitors, the challenges they face, and approaches to suppress self‐discharge and develop high‐concentration redox‐active electrolytes for performance promotion.

show abstract

Redox-Enhanced Electrochemical Capacitors: Status, Opportunity, and Best Practices for Performance Evaluation

Cited by 179 publications

References 60 publications

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

Designing Core‐Shell Ni(OH)₂@CuO Nanowire Arrays on 3D Copper Foams for High‐Performance Asymmetric Supercapacitors

Redox‐Mediator‐Enhanced Electrochemical Capacitors: Recent Advances and Future Perspectives

Contact Info

Product

Resources

About

Redox-Enhanced Electrochemical Capacitors: Status, Opportunity, and Best Practices for Performance Evaluation

Cited by 179 publications

References 60 publications

A MnCo2O4@NiMoO4 Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

A MnCo2O4@NiMoO4 Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

Designing Core‐Shell Ni(OH)2@CuO Nanowire Arrays on 3D Copper Foams for High‐Performance Asymmetric Supercapacitors

Redox‐Mediator‐Enhanced Electrochemical Capacitors: Recent Advances and Future Perspectives

Contact Info

Product

Resources

About

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

Designing Core‐Shell Ni(OH)₂@CuO Nanowire Arrays on 3D Copper Foams for High‐Performance Asymmetric Supercapacitors