Free standing flexible graphene oxide + α-MnO2 composite cathodes for Li–Air batteries

Özcan, Şeyma; Tokur, Mahmud; Çetinkaya, Tuğrul; Güler, Aslıhan; Uysal, Mustafa; Guler, Mehmet Oguz; Akbulut, Hatem

doi:10.1016/j.ssi.2015.12.016

Cited by 40 publications

(19 citation statements)

References 30 publications

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“…As obtained product was then filtered by using polyvinylidene fluoride (0.45 μm, Millipore) membrane. The details of the graphene oxide synthesizing method are also given in a previous report of our group …”

Section: Methodsmentioning

confidence: 99%

“…The details of the graphene oxide synthesizing method are also given in a previous report of our group. 19 2.5 | Synthesis of yolk-shell Ni 3 Sn 4 / graphene free standing electrodes 30 mg as-synthesized graphene oxide and 10 mg of yolkshell Ni 3 Sn 4 were dispersed in a solution containing 50-mL bidistilled water and 5 mg of SDS (Sodium dodecyl sulfate, Merck, Calbiochem, > 97%). A homogenous dispersion obtained after sonication process for 2 hours.…”

Section: Synthesis Of Graphene Oxidementioning

confidence: 99%

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Intermetallic Ni₃Sn₄-based graphene@carbon hybrid composites for lithium-ion batteries

et al. 2018

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Summary In this paper, nanosized Ni3Sn4 nanoparticles were synthesized by chemical reduction technique. A facile strategy is also developed to synthesize the yolk‐shell Ni3Sn4 nanoparticles decorated between the layers of multilayer graphene to obtain high‐capacity, long service life with comparable cost Li‐ion batteries. Ni3Sn4 nanoparticles in the form of yolk‐shell morphology were synthesized between 30 and 130 nm in size and homogeneously anchored on graphene layers as spacers preventing the layers merging after vacuum filtration. The characterization of the as‐synthesized composite electrodes was performed by scanning electron microscopy and X‐ray diffraction methods. As an anode electrode, yolk‐shell Ni3Sn4/graphene composite electrodes revealed a stable capacity of 324.5 mAh g−1 after 250 cycles, indicating that the composites might have a promising future application in Li‐ion batteries. The results have shown that unique yolk‐shell Ni3Sn4/graphene hybrid composite structure shows extraordinary electrochemical performance with superior reversible capacity and improved cyclic performance, indicating that the stacking of the active electrode nanoparticles between the graphene layers is a good method for maximum specific capacity outputs.

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Section: Methodsmentioning

confidence: 99%

Section: Synthesis Of Graphene Oxidementioning

confidence: 99%

Intermetallic Ni₃Sn₄-based graphene@carbon hybrid composites for lithium-ion batteries

et al. 2018

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“…The α‐MnO 2 used in this study is produced by microwave driven hydrothermal method under a controlled redox reaction in a MnSO 4 − KMnO 4 aqueous solution. The redox reaction during the synthesizing procedure comprises two half reactions may be given as follows;

{Mn}^{2 +} + {2H}_{2} normalO \to {MnO}_{2} + {4H}^{+} + {2e}^{-} ((), E^{0} = 1.23 normalV)

{MnO}_{4}^{-} + {4H}^{+} + {3e}^{-} \to {MnO}_{2} + {2H}_{2} normalO ((), E^{0} = 1.68 normalV)

…”

Section: Experimental Studiesmentioning

confidence: 99%

“…30 mg of graphene oxide which was produced via Hummers method, 15 mg of LCMO, 5.6 mL of hydrazine hydrate, 45 mg sodium dodecyl sulfate (SDS) and 3 mg of PVA is sonicated in 60 mL bidistilled water for 30 min. The solution was filtered and washed several times via vacuum filtration to obtain free standing G/LCMO electrode . Freestanding electrode was then carefully peeled‐off from the filter and kept at 60°C for 12 h. Similar procedure was also applied to G/LMO samples.…”

Section: Experimental Studiesmentioning

confidence: 99%

“…The α-MnO 2 used in this study is produced by microwave driven hydrothermal method under a controlled redox reaction in a MnSO 4 − KMnO 4 aqueous solution. The redox reaction during the synthesizing procedure comprises two half reactions may be given as follows [25][26][27] ; 25 Freestanding electrode was then carefully peeled-off from the filter and kept at 60°C for 12 h. Similar procedure was also applied to G/LMO samples.…”

Section: Introductionmentioning

confidence: 99%

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Graphene assisted template based LiMn₂O₄flexible cathode electrodes

et al. 2018

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Summary In this paper, a systematic method has been developed to produce highly flexible and robust graphene/LiMn2O4 (G/LMO) and graphene/LiCr0.05Mn1.95O4 (G/LCMO) free‐standing composite cathode electrodes with increased specific capacity and improved electrochemical capability. Spinel LMO nanorods are synthesized by calcination method followed by a hydrothermal reaction technique. As‐synthesized nanorods were then embedded in a graphene layer which will in turn serve as a self‐standing binder‐free cathode electrode. Spinel LMO and LCMO nanorods with a length of 600 nm and width of 50 nm were then homogenously entrapped and distributed within the layers of conductive graphene structure. This hybrid structure will help to eliminate the use of heavy metal current collectors and electrically resistant binders or even conductive additives. A discharge capacity of 114.5 mAh g−1 is obtained after first cycle and %72 capacity retention is obtained after 250 cycles from G/LCMO freestanding samples. The enhancement in the electrochemical properties is due to the unique freestanding structure of the cathode electrodes.

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Carbon Nanotubes/Carbon Fiber Paper Supported MnO₂ Cathode Catalyst for Li−Air Batteries

Fan

Chen

et al. 2017

ChemElectroChem

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Lithium−air batteries (LABs) are considered one of the most promising energy conversion systems for delivering large specific energy. However, practical applications still face major challenges, including poor rate capability, short cycle life, and low round‐trip efficiencies. Here, we report a novel strategy to improve the catalytic activity of MnO2 through the combination of 3D MnO2 and carbon nanotubes/carbon fiber paper (CNTs/CFP) with a binder‐free structure. Side reactions related to the binder are precluded in this design. The presence of CNTs not only promotes the formation of a 3D structure of the air electrode, but directs the uniform deposition of MnO2. When applied as a cathode in LABs, the as‐prepared MnO2/CNTs/CFP electrode achieves comparable specific capacity (with a discharge capacity of 8723.5 mAh g−1(CNTs+MnO2) at 100 mA g−1). The encouraging electrochemical performance is found to benefit from free‐standing nanoporous structures, which provide more active sites for enabling oxygen reduction. It is also attributed to the decreased side reactions.

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Free standing flexible graphene oxide + α-MnO2 composite cathodes for Li–Air batteries

Cited by 40 publications

References 30 publications

Intermetallic Ni₃Sn₄-based graphene@carbon hybrid composites for lithium-ion batteries

Intermetallic Ni₃Sn₄-based graphene@carbon hybrid composites for lithium-ion batteries

Graphene assisted template based LiMn₂O₄flexible cathode electrodes

Carbon Nanotubes/Carbon Fiber Paper Supported MnO₂ Cathode Catalyst for Li−Air Batteries

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Free standing flexible graphene oxide + α-MnO2 composite cathodes for Li–Air batteries

Cited by 40 publications

References 30 publications

Intermetallic Ni3Sn4-based graphene@carbon hybrid composites for lithium-ion batteries

Intermetallic Ni3Sn4-based graphene@carbon hybrid composites for lithium-ion batteries

Graphene assisted template based LiMn2O4flexible cathode electrodes

Carbon Nanotubes/Carbon Fiber Paper Supported MnO2 Cathode Catalyst for Li−Air Batteries

Contact Info

Product

Resources

About

Intermetallic Ni₃Sn₄-based graphene@carbon hybrid composites for lithium-ion batteries

Intermetallic Ni₃Sn₄-based graphene@carbon hybrid composites for lithium-ion batteries

Graphene assisted template based LiMn₂O₄flexible cathode electrodes

Carbon Nanotubes/Carbon Fiber Paper Supported MnO₂ Cathode Catalyst for Li−Air Batteries