Boosting the energy density of iron-cobalt oxide based hybrid supercapacitors by redox-additive electrolytes

Zhao, Yan; Zheng, Jihua; Yuan, Ming; Wang, Yaqing; Liu, Wenjie; Yang, Shi-Jie; Li, Guochun; Bu, Yongfeng

doi:10.1016/j.jallcom.2021.160886

Cited by 22 publications

(9 citation statements)

References 39 publications

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“…The redox reaction occurring in the RA electrolyte is explained as followed. 23,30 During the charging process, the oxidation of Co occurs: Co 2+ to Co 3+ and Co 3+ to Co 4+ , leading to the loss of electrons. The electrons then transfer to Fe(CN) 6 18,31 In the case of the RA electrolyte, the lower plateau is insignicance.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the use of redox additive (RA) electrolyte has also been demonstrated to enhance the C sp . [21][22][23][24][25] Herein, we present a room-temperature process to synthesize Co 3 V 2 O 8 nanowalls on Ni foam (NF) using a templateassisted growth. Also, K 3 [Fe(CN) 6 ] RA electrolyte is used to enhance ionic conductivity of electrolyte and provide additional redox reactions, targeting in the further capacitance improvements.…”

Section: Introductionmentioning

confidence: 99%

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3D hierarchical cobalt vanadate nanosheet arrays on Ni foam coupled with redox additive for enhanced supercapacitor performance

2022

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3D hierarchical cobalt vanadate nanosheet arrays on Ni foam coupled with redox additive for enhanced supercapacitor performance

2022

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“…The anode peak corresponds to a voltage of −0.70 V, the cathode of −1.10 V. These peaks represent rapidly reversible redox processes occurring at the interface between the composite phases on the one hand and the electrolyte on the other. The difference between the cathode and anode peak is 0.44 V, corresponding to the Faraday reversible reactions on the material [50]. The increase in the CVA area of the curve for sample K3 in comparison with K1 and K2 indicates the accumulation of a larger amount of charge on its surface, which is mainly provided by the course of Faraday pseudocapacitive reactions.…”

Section: Electroconductive and Electrochemical Propertiesmentioning

confidence: 97%

Structurally Dependent Electrochemical Properties of Ultrafine Superparamagnetic ‘Core/Shell’ γ-Fe2O3/Defective α-Fe2O3 Composites in Hybrid Supercapacitors

et al. 2021

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The paper presents a method for obtaining electrochemically active ultrafine composites of iron oxides, superparamagnetic ‘core/shell’ γ-Fe2O3/defective α-Fe2O3, which involved modifying sol-gel citrate synthesis, hydrothermal treatment of the formed sol, and subsequent annealing of materials in the air. The synthesized materials’ phase composition, magnetic microstructure, and structural, morphological characteristics have been determined via X-ray analysis, Mossbauer spectroscopy, scanning electron microscopy (SEM), and adsorption porometry. The mechanisms of phase stability were analyzed, and the model was suggested as FeOOH → γ-Fe2O3 → α-Fe2O3. It was found that the presence of chelating agents in hydrothermal synthesis encapsulated the nucleus of the new phase in the reactor and interfered with the direct processes of recrystallization of the structure with the subsequent formation of the α-Fe2O3 crystalline phase. Additionally, the conductive properties of the synthesized materials were determined by impedance spectroscopy. The electrochemical activity of the synthesized materials was evaluated by the method of cyclic voltammetry using a three-electrode cell in a 3.5 M aqueous solution of KOH. For the ultrafine superparamagnetic ‘core/shell’ γ-Fe2O3/defective α-Fe2O composite with defective hematite structure and the presence of ultra-dispersed maghemite with particles in the superparamagnetic state was fixed increased electrochemical activity, and specific discharge capacity of the material is 177 F/g with a Coulomb efficiency of 85%. The prototypes of hybrid supercapacitor with work electrodes based on ultrafine composites superparamagnetic ‘core/shell’ γ-Fe2O3/defective α-Fe2O3 have a specific discharge capacity of 124 F/g with a Coulomb efficiency of 93% for current 10 mA.

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“…However, this area has been less investigated due to the intricacy of optimising the electrode-electrolyte compatability. [80] The poor intrinsic electrical conductivity of FeCo 2 O 4 , along with limited electrodeelectrolyte contact area for participation in faradaic reactions, are responsible for the unsatisfactory capacitance of FeCo 2 O 4 to some extent. [81] To overcome this, Zhao et al [80] fabricated an aqueous FeCo 2 O 4 needle like array(NLA)/ Carbon cloth based hybrid supercapacitor using a redox additive electrolyte, K 3 [Fe-(CN) 6 ] along with KOH.…”

Section: Double-layered and Triple-layered Feco 2 O 4 Core-shell Supercapacitorsmentioning

confidence: 99%

“…[80] The poor intrinsic electrical conductivity of FeCo 2 O 4 , along with limited electrodeelectrolyte contact area for participation in faradaic reactions, are responsible for the unsatisfactory capacitance of FeCo 2 O 4 to some extent. [81] To overcome this, Zhao et al [80] fabricated an aqueous FeCo 2 O 4 needle like array(NLA)/ Carbon cloth based hybrid supercapacitor using a redox additive electrolyte, K 3 [Fe-(CN) 6 ] along with KOH. The addition of Fe(CN) 6 3À ions is found to reduce the charge transfer resistance, thereby promoting the loss and gain of Co ions during the charge-discharge process.…”

Section: Double-layered and Triple-layered Feco 2 O 4 Core-shell Supercapacitorsmentioning

confidence: 99%

Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo₂O₄ and Its Composites

Shetgaonkar

Salkar

Morajkar

2021

Chemistry An Asian Journal

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It is well established that the excessive and uncontrolled use of fossil fuels and organic chemicals have put a risk to the earth‘s environment and the life that sustains within it. Carbon‐free, sustainable, alternative energy technologies have therefore become the prime focus of current research. Smart inorganic materials have emerged as the potential solution to suffice energy needs and remediate the organic pollutants discharged to the environment. One such promising, versatile material is FeCo2O4 which has gained immense research interest in the present decade due to its high efficiency and performance in energy and environmental applications. Innovative material design strategies involving the interplay of nanostructured morphology, chemical composition, redox surface states, and defect engineering have significantly enhanced both electrochemical and catalytic properties of FeCo2O4. Therefore, this review article aims to provide the first‐ever comprehensive account of the latest research and developments in design‐synthesis strategies, characterization techniques, and applications of nanostructured FeCo2O4 and its composites in various electrochemical as well as catalytic applications. A detailed account of the nanostructured FeCo2O4 and its composites in various energy storage and conversion devices such as supercapacitors (SCs), batteries, and fuel cells has been presented. Furthermore, a special section has been devoted to highlight the role of FeCo2O4 in enhancing the sluggish reaction kinetics of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in water splitting application. This review also highlights the role of nanostructured FeCo2O4 in photocatalytic waste water treatment, gas sensing, and dual‐phase membrane technologies wherein FeCo2O4 has demonstrated promising performance.

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Boosting the energy density of iron-cobalt oxide based hybrid supercapacitors by redox-additive electrolytes

Cited by 22 publications

References 39 publications

3D hierarchical cobalt vanadate nanosheet arrays on Ni foam coupled with redox additive for enhanced supercapacitor performance

3D hierarchical cobalt vanadate nanosheet arrays on Ni foam coupled with redox additive for enhanced supercapacitor performance

Structurally Dependent Electrochemical Properties of Ultrafine Superparamagnetic ‘Core/Shell’ γ-Fe2O3/Defective α-Fe2O3 Composites in Hybrid Supercapacitors

Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo₂O₄ and Its Composites

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Boosting the energy density of iron-cobalt oxide based hybrid supercapacitors by redox-additive electrolytes

Cited by 22 publications

References 39 publications

3D hierarchical cobalt vanadate nanosheet arrays on Ni foam coupled with redox additive for enhanced supercapacitor performance

3D hierarchical cobalt vanadate nanosheet arrays on Ni foam coupled with redox additive for enhanced supercapacitor performance

Structurally Dependent Electrochemical Properties of Ultrafine Superparamagnetic ‘Core/Shell’ γ-Fe2O3/Defective α-Fe2O3 Composites in Hybrid Supercapacitors

Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo2O4 and Its Composites

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Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo₂O₄ and Its Composites