rGO / MnO2 / Polyterthiophene ternary composite: pore size control, electrochemical supercapacitor behavior and equivalent circuit model analysis

Ateş, Murat; Kuzgun, Ozge; Yildirim, Murat Onur; Özkan, Haydar

doi:10.1007/s10965-020-02183-5

Cited by 11 publications

(4 citation statements)

References 114 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 15 ] As a polymer semiconductor, pTTh has the advantages of convenient synthesis, low cost, and broad light absorption. [ 16 ] Herein, in situ electropolymerized pTTh is used as a photocatalyst in Li–O 2 batteries coupled with a redox mediator for the first time. During the discharge, the discharge voltage of the battery is enhanced by the photovoltage generated on the pTTh photoelectrode.…”

Section: Introductionmentioning

confidence: 99%

Light‐Assisted Li–O₂ Batteries with Lowered Bias Voltages by Redox Mediators

Liu

Yang

et al. 2022

Small

View full text Add to dashboard Cite

The enormous overpotential caused by sluggish kinetics of the oxygen reduction reaction and the oxygen evolution reaction prevents the practical application of Li–O2 batteries. The recently proposed light‐assisted strategy is an effective way to improve round‐trip efficiency; however, the high‐potential photogenerated holes during the charge would degrade the electrolyte with side reactions and poor cycling performance. Herein, a synergistic interaction between a polyterthiophene photocatalyst and a redox mediator is employed in Li–O2 batteries. During the discharge, the voltage can be compensated by the photovoltage generated on the photoelectrode. Upon the charge with illumination, the photogenerated holes can be consumed by the oxidization of iodide ions, and thus the external circuit voltage is compensated by photogenerated electrons. Accordingly, a smaller bias voltage is needed for the semiconductor to decompose Li2O2, and the potential of photogenerated holes decreases. Finally, the round‐trip efficiency of the battery reaches 97% with a discharge voltage of 3.10 V and a charge voltage of 3.19 V. The batteries show stable operation up to 150 cycles without increased polarization. This work provides new routes for light‐assisted Li–O2 batteries with reduced overpotential and boosted efficiency.

show abstract

Section: Introductionmentioning

confidence: 99%

Light‐Assisted Li–O₂ Batteries with Lowered Bias Voltages by Redox Mediators

Liu

Yang

et al. 2022

Small

View full text Add to dashboard Cite

show abstract

“…S9c, the admittance plots are detected. The highest point (−Y′′) of CNF@PTPAn-2 is obtained as 0.55 S, also higher than that of PTPAn-C (0.04 S), indicating the superior electronic conductivity [46].…”

Section: Detailed Kinetic Behaviors Of Cnf@ptpan Cathodementioning

confidence: 86%

Flexible polytriphenylamine-based cathodes with reinforced energy-storage capacity for high-performance sodium-ion batteries

Zhou

et al. 2021

Sci. China Mater.

View full text Add to dashboard Cite

Owing to the excellent redox reversibility and structural diversity, polytriphenylamine (PTPAn) has been regarded as one of the promising cathode candidates for sodium-ion batteries. However, it still suffers from the bulk aggregation and low operating capacity in practical applications. Assisted by the in-situ polymerization, leaf-like PTPAn nanosheets are uniformly introduced on the surface of carbon nanofibers (CNFs) to form the free-standing CNF@PTPAn composite electrodes. Interestingly, the formation mechanism of the leaf-on-branch structure of CNF@PTPAn composites is systematically explored, confirming that the controlling of oxidation rate and growth degree plays crucial roles in tuning the morphology and active material content of the composite electrodes. Supported by the capacity-cutting analysis, the effective coupling between the active PTPAn and conductive CNFs can provide fast electron/ion-shuttling channels and deepen the electrochemical reaction process. At 50 mA g −1 , the capacity of the optimized CNF@PTPAn composite can reach 105 mA h g −1 , with a stable rate capability of 78 mA h g −1 even at 400 mA g −1 after 500 cycles in a half cell. The detailed kinetic analysis confirms that the ion-storage behaviors in the lowvoltage region can be tailored for the improved capacitive contribution and diffusion coefficients. Meanwhile, the flexible CNF-based full cell with CNF@PTPAn as the cathode and CNFs as the anode exhibits a high energy density of 60 W h kg −1 at 938 W kg −1 . Based on this, the rational design is expected to provide more possibilities to obtain advanced freestanding electrode systems.

show abstract

“…Given the short duration of the redox reaction, the specific capacitance value drops as the scan rate rises. 187,188 Besides PANI and PTTh, there are several MnO 2 composites with conducting polymers as supercapacitor electrodes, such as PPy/MnO 2 (786 F/g at 3 A/g), 189 PEDOT-MnO 2 (315 F/g at 1 mA/cm 2 ), 181 MnO 2 /PoPPD/graphite/PTFE (262.2 F/g at .5 A/g), 190 and CNT-MnO 2 -POAP (412 F/g at .5 A/g). 191 MnO 2 -polymer composites are still effective, although not as good as MnO 2 -carbon or metal oxide composites regarding energy density.…”

Section: Polymer-based Compositesmentioning

confidence: 99%

“…For these reasons, adding PTh to the rGO/MnO 2 nanocomposite increases the specific capacity of rGO/MnO 2 /PTh. Given the short duration of the redox reaction, the specific capacitance value drops as the scan rate rises 187,188 . Besides PANI and PTTh, there are several MnO 2 composites with conducting polymers as supercapacitor electrodes, such as PPy/MnO 2 (786 F/g at 3 A/g), 189 PEDOT–MnO 2 (315 F/g at 1 mA/cm 2 ), 181 MnO 2 /PoPPD/graphite/PTFE (262.2 F/g at .5 A/g), 190 and CNT–MnO 2 –POAP (412 F/g at .5 A/g) 191 …”

Section: Binary Composite Based On Mno2 For Supercapacitorsmentioning

confidence: 99%

Potential of MnO₂‐based composite and numerous morphological for enhancing supercapacitors performance

Diantoro

Istiqomah

Fath

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

The development of materials and electrochemical energy storage (EES) technologies are currently taking the lead and showing excellent performance in the global effort to tackle the issues of sustainable energy supply. Supercapacitors have been widely studied among the EES technologies as they exhibit quick charging rates under high‐power conditions. Manganese dioxide (MnO2) has attracted renewed interest as a promising material due to its high theoretical capacitance and high energy density. However, the widespread application is immediately impacted by low conductivity. Hence, combining nanomaterials and various morphologies of MnO2 can improve the electrochemical performance of supercapacitors. This paper presents a review based on the composites of nanomaterials/MnO2 with various morphologies. Their mechanism and practical applications in supercapacitors are introduced in detail. Finally, the challenges and next steps in developing MnO2 electrode materials are proposed.

show abstract

rGO / MnO2 / Polyterthiophene ternary composite: pore size control, electrochemical supercapacitor behavior and equivalent circuit model analysis

Cited by 11 publications

References 114 publications

Light‐Assisted Li–O₂ Batteries with Lowered Bias Voltages by Redox Mediators

Light‐Assisted Li–O₂ Batteries with Lowered Bias Voltages by Redox Mediators

Flexible polytriphenylamine-based cathodes with reinforced energy-storage capacity for high-performance sodium-ion batteries

Potential of MnO₂‐based composite and numerous morphological for enhancing supercapacitors performance

Contact Info

Product

Resources

About

rGO / MnO2 / Polyterthiophene ternary composite: pore size control, electrochemical supercapacitor behavior and equivalent circuit model analysis

Cited by 11 publications

References 114 publications

Light‐Assisted Li–O2 Batteries with Lowered Bias Voltages by Redox Mediators

Light‐Assisted Li–O2 Batteries with Lowered Bias Voltages by Redox Mediators

Flexible polytriphenylamine-based cathodes with reinforced energy-storage capacity for high-performance sodium-ion batteries

Potential of MnO2‐based composite and numerous morphological for enhancing supercapacitors performance

Contact Info

Product

Resources

About

Light‐Assisted Li–O₂ Batteries with Lowered Bias Voltages by Redox Mediators

Light‐Assisted Li–O₂ Batteries with Lowered Bias Voltages by Redox Mediators

Potential of MnO₂‐based composite and numerous morphological for enhancing supercapacitors performance