Zinc Ferrite Anchored Multiwalled Carbon Nanotubes for High‐Performance Supercapacitor Applications

Raut, Shrikant S.; Sankapal, Babasaheb R.; Hossain, Md. Shahriar A.; Pradhan, Subrata; Salunkhe, Rahul R.; Yamauchi, Yusuke

doi:10.1002/ejic.201700836

Cited by 65 publications

(20 citation statements)

References 32 publications

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“…[14] On the other hand, ZnFe 2 O 4 is synthesized from environmentally benign and earth abundant elements. [15] It also has a high theoretical capacitive value of 1072 Am g À 1 and low work voltage. [10] However, it has low conductivity and stability [15,16] and unlike CoOOH/NiOOH, ZnOOH has little to no OER activity.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Electrochemical Formation of a Core‐Shell ZnFe₂O₄@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

2020

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Low‐cost, stable and highly active electrocatalysts for the oxygen evolution reaction (OER) are needed to improve the efficiency of hydrogen production via water splitting. However, developing such a catalyst is still a challenge. Zinc ferrite (ZnFe2O4) is non‐toxic and made from cheap and earth‐abundant materials making it a potential raw material for synthesizing “green” low‐cost catalysts for the OER. However, it has largely been ignored due to its low stability, conductivity and OER‐inactive Zn2+. Herein, ZnFe2O4 is used effectively as a pre‐catalyst to synthesize core‐shell ZnFe2O4@Zn(Fe)OOH polycrystalline heterostructures in situ via cyclic voltammetry. The ZnFe2O4@Zn(Fe)OOH heterostructures display much higher OER catalytic activity and stability than the benchmark RuO2 catalyst in alkaline medium, owing to its high conductivity, stability and electrochemically active surface area (ECSA). Our findings thus reveal a new and effective way by which ZnFe2O4 can be applied in water electrolysis.

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Section: Introductionmentioning

confidence: 99%

“…[15] It also has a high theoretical capacitive value of 1072 Am g À 1 and low work voltage. [10] However, it has low conductivity and stability [15,16] and unlike CoOOH/NiOOH, ZnOOH has little to no OER activity. [17][18][19] Obviously, these factors limit it potential as an electrode material for OER electrocatalysis.…”

Section: Introductionmentioning

confidence: 99%

In Situ Electrochemical Formation of a Core‐Shell ZnFe₂O₄@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

2020

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“…Improving the lower capacitance restrictions of CNT electronics has been a prevalent research effort focusing on adding Faradaic energy storage mechanisms to existing, high power, high conductivity behavior . Metal oxides composites have been extensively investigated to progress specific capacitance by exploiting the oxides ability to create weak bonds with surface CNT ions thereby storing charge .…”

Section: Introductionmentioning

confidence: 99%

Creating Faradaic Carbon Nanotube Electrodes with Mild Chemical Oxidation

Emmett

Kowalske

Mou

et al. 2019

Batteries & Supercaps

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The development of new materials to improve interfacial charge transfer characteristics will drastically improve energy storage, heterogeneous catalysis, and many other electrochemical applications. Here, we report a simple procedure that can harness the Faradaic nature of residual iron nanoparticle catalysts that endure within multi-walled carbon nanotubes (MWNT) post-synthesis, thereby alleviating the challenges associated with forging hybrid nanocomposite electrodes. Nonpurified MWNTs, undergo a chemical oxidation process in acidic conditions with KMnO 4 to partially "unzip" the MWNTs and expose the redox-active iron nanoparticles to the electrolyte. A stable redox peak associated with the Fe 2 + /3 + transition is achieved during the MWNT oxidation process yielding a~350 % increase in capacitance (> 300 F g À 1 ) relative to purified MWNT electrodes (70 F g À 1 ). While these materials solely may be pragmatic as energy storage electrodes, the integration of redox species within an inert carbon electrode will also provide new opportunities to accelerate heterogeneous charge transfer reactions.

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“…Therefore, we always hope that the electrode material has no conductive substrate and has a high specific capacitance. Then, adding nano‐carbon materials to the electrode material improves conductivity and becomes a feasible method , …”

Section: Introductionmentioning

confidence: 99%

One‐Step Hydrothermal Synthesis of Carbon‐Coated Nickel–Copper Sulfide Nanoparticles for High‐Performance Asymmetric Supercapacitors

Zheng

Wang

et al. 2019

Eur J Inorg Chem

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The C@Ni0.9Cu0.1‐S supercapacitor electrode material with good electrochemical performance was successfully prepared by a simple hydrothermal method. C@Ni0.9Cu0.1‐S obtained by adding glucose has better electrochemical performance than single Ni0.9Cu0.1‐S. In this work, the electrochemical properties of C@Ni0.9Cu0.1‐S electrode materials and asymmetric supercapacitors were studied in detail. This single‐electrode specific capacity in the 6 M KOH solution reaches 1986 F g–1 and the potential window is 0 to 0.49 V. In order to increase the energy density and potential window of the supercapacitor, C@Ni0.9Cu0.1‐S is used as a positive electrode, and AC is used as a negative electrode to assemble asymmetric supercapacitors. The results show that the working voltage of C@Ni0.9Cu0.1‐S∥ AC asymmetric supercapacitor increases to 1.6 V, and the specific capacitance and energy density can reach 184.4 F g–1 and 65.6 Wh kg–1, respectively, and has excellent cycling stability. These excellent electrochemical properties indicate that C@Ni0.9Cu0.1‐S is a promising supercapacitor electrode material.

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Zinc Ferrite Anchored Multiwalled Carbon Nanotubes for High‐Performance Supercapacitor Applications

Cited by 65 publications

References 32 publications

In Situ Electrochemical Formation of a Core‐Shell ZnFe₂O₄@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

In Situ Electrochemical Formation of a Core‐Shell ZnFe₂O₄@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

Creating Faradaic Carbon Nanotube Electrodes with Mild Chemical Oxidation

One‐Step Hydrothermal Synthesis of Carbon‐Coated Nickel–Copper Sulfide Nanoparticles for High‐Performance Asymmetric Supercapacitors

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Zinc Ferrite Anchored Multiwalled Carbon Nanotubes for High‐Performance Supercapacitor Applications

Cited by 65 publications

References 32 publications

In Situ Electrochemical Formation of a Core‐Shell ZnFe2O4@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

In Situ Electrochemical Formation of a Core‐Shell ZnFe2O4@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

Creating Faradaic Carbon Nanotube Electrodes with Mild Chemical Oxidation

One‐Step Hydrothermal Synthesis of Carbon‐Coated Nickel–Copper Sulfide Nanoparticles for High‐Performance Asymmetric Supercapacitors

Contact Info

Product

Resources

About

In Situ Electrochemical Formation of a Core‐Shell ZnFe₂O₄@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

In Situ Electrochemical Formation of a Core‐Shell ZnFe₂O₄@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium