High performance MnO2 nanoflower supercapacitor electrode by electrochemical recycling of spent batteries

Ali, Gomaa A. M.; Yusoff, Mashitah M.; Shaaban, E.R.; Chong, Kwok Feng

doi:10.1016/j.ceramint.2017.03.195

Cited by 141 publications

(52 citation statements)

References 47 publications

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“…The extrapolation of the linear part intersects with the voltage axis and provides the values of flat-band potential or the Schottky barrier, which was found to be 0.91 and 1.03 V for FC and FCCD25, respectively. The more positive flat-band potential of FCCD25 makes it a better catalyst by increasing the bandgap and conductivity [ 72 ]. Based on electrochemical measurements and the Mott–Schottky results, CD improves the electrochemical surface area and flat-band potential, which improves the electrocatalytic performance of the hybrid material.…”

Section: Resultsmentioning

confidence: 99%

Construction of FeCo2O4@N-Doped Carbon Dots Nanoflowers as Binder Free Electrode for Reduction and Oxidation of Water

et al. 2020

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Electrochemical water splitting is known as a potential approach for sustainable energy conversion; it produces H2 fuel by utilizing transition metal-based catalysts. We report a facile synthesis of FeCo2O4@carbon dots (CDs) nanoflowers supported on nickel foam through a hydrothermal technique in the absence of organic solvents and an inert environment. The synthesized material with a judicious choice of CDs shows superior performance in hydrogen and oxygen evolution reactions (HER and OER) compared to the FeCo2O4 electrode alone in alkaline media. For HER, the overpotential of 205 mV was able to produce current densities of up to 10 mA cm−2, whereas an overpotential of 393 mV was needed to obtain a current density of up to 50 mA cm−2 for OER. The synergistic effect between CDs and FeCo2O4 accounts for the excellent electrocatalytic activity, since CDs offer exposed active sites and subsequently promote the electrochemical reaction by enhancing the electron transfer processes. Hence, this procedure offers an effective approach for constructing metal oxide-integrated CDs as a catalytic support system to improve the performance of electrochemical water splitting.

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Section: Resultsmentioning

confidence: 99%

Construction of FeCo2O4@N-Doped Carbon Dots Nanoflowers as Binder Free Electrode for Reduction and Oxidation of Water

et al. 2020

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“…The arcs are related to the interfacial charge transfer resistance and double-layer capacitance of the electrode, as reported in the literature. [26][27][28][29] The proposed six-component equivalent circuit used for the analysis of the EIS spectra has been shown in the Fig. 11.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Calcined chicken eggshell electrode for battery and supercapacitor applications

et al. 2019

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“…The MnO 2 nanoparticles revealed their major IR absorption bands ( Figure 3 b). The absorption band at 3419 cm −1 originates from –OH stretching [ 50 ], the vibrational modes at 1643, 1565, and 1419 cm −1 arise from –OH bending [ 51 , 52 ], and the IR absorbance at 1121 cm −1 comes from the Mn–OH vibration. In addition, MnO 2 showed to involve some vibration modes at 503, 616, 710, and 868 cm −1 , arising from Mn–O–Mn stretching in α-MnO 2 [ 28 , 44 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO2 Nanoparticles—Decorated Activated Carbon Nanoflakes

et al. 2020

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In the present work, we demonstrated the upcycling technique of effective wastewater treatment via photocatalytic hydrogen production by using the nanocomposites of manganese oxide-decorated activated carbon (MnO2-AC). The nanocomposites were sonochemically synthesized in pure water by utilizing MnO2 nanoparticles and AC nanoflakes that had been prepared through green routes using the extracts of Brassica oleracea and Azadirachta indica, respectively. MnO2-AC nanocomposites were confirmed to exist in the form of nanopebbles with a high specific surface area of ~109 m2/g. When using the MnO2-AC nanocomposites as a photocatalyst for the wastewater treatment, they exhibited highly efficient hydrogen production activity. Namely, the high hydrogen production rate (395 mL/h) was achieved when splitting the synthetic sulphide effluent (S2− = 0.2 M) via the photocatalytic reaction by using MnO2-AC. The results stand for the excellent energy-conversion capability of the MnO2-AC nanocomposites, particularly, for photocatalytic splitting of hydrogen from sulphide wastewater.

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High performance MnO2 nanoflower supercapacitor electrode by electrochemical recycling of spent batteries

Cited by 141 publications

References 47 publications

Construction of FeCo2O4@N-Doped Carbon Dots Nanoflowers as Binder Free Electrode for Reduction and Oxidation of Water

Construction of FeCo2O4@N-Doped Carbon Dots Nanoflowers as Binder Free Electrode for Reduction and Oxidation of Water

Calcined chicken eggshell electrode for battery and supercapacitor applications

Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO2 Nanoparticles—Decorated Activated Carbon Nanoflakes

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