Electrochemical Activation of Graphene at Low Temperature: The Synthesis of Three-Dimensional Nanoarchitectures for High Performance Supercapacitors and Capacitive Deionization

Zoromba, Mohamed Shafick; Abdel‐Aziz, M.H.; Bassyouni, M.; Gutub, Saud A.; Demko, Denisa; Abdelkader, Amr M.

doi:10.1021/acssuschemeng.6b02869

Cited by 48 publications

(26 citation statements)

References 52 publications

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“…A specific capacitance as high as 320 F g −1 was obtained at a current density of 0.3 A g −1 , about 55% more than the undoped electrode. 35,36 Even without nitrogen doping, the electrochemically anodised sample showed high gravimetric capacitance compared with other reported graphene materials. Table S1 summarises the capacitance obtained from the current work with that in the literature.…”

Section: Testing the Electrochemical Supercapacitormentioning

confidence: 92%

Controlled electrochemical doping of graphene-based 3D nanoarchitecture electrodes for supercapacitors and capacitive deionisation

Abdelkader

Fray

2017

Nanoscale

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Chemically-doped graphenes are promising electrode materials for energy storage and electrosorption applications. Here, an affordable electrochemical green process is introduced to dope graphene with nitrogen. The process is based on reversing the polarity of two identical graphene oxide (GO) electrodes in molten KCl-LiCl-LiN. During the cathodic step, the oxygen functional groups on the GO surface are removed through direct electro-deoxidation reactions or a reaction with the deposited lithium. In the anodic step, nitrogen is adsorbed onto the surface of graphene and subsequently reacts to form nitrogen-doped graphene. The doping process is controllable, and graphene with up to 7.4 at% nitrogen can be produced. The electrochemically treated electrodes show a specific capacitance of 320 F g in an aqueous KOH electrolyte and maintain 96% of this value after 10 000 cycles. The electrodes also display excellent electrosorption performance in capacitive deionisation devices with the salt removal efficiency reaching up to 18.6 mg g.

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Section: Testing the Electrochemical Supercapacitormentioning

confidence: 92%

Controlled electrochemical doping of graphene-based 3D nanoarchitecture electrodes for supercapacitors and capacitive deionisation

Abdelkader

Fray

2017

Nanoscale

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“…The XPS survey spectrum of Fe@HNCS-800 indicated the presence of Fe, O, N, and C in the sample (Figure 3c), and spectra of other products are similar (not showing here). The C 1s spectrum of Fe@HNCS-800 shows a broad peak between 283 eV and 287 eV (Figure 3d), which can be deconvoluted into three peaks at 284.5 eV, 285.5 eV, and 288.3 eV, corresponding to C-C, C-OR, and C-Cl, respectively [57]. The N 1s spectrum is shown in Figure 3f.…”

Section: Resultsmentioning

confidence: 98%

Electrocatalytic Assisted Performance Enhancement for the Na-S Battery in Nitrogen-Doped Carbon Nanospheres Loaded with Fe

et al. 2020

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Room temperature sodium-sulfur batteries have been considered to be potential candidates for future energy storage devices because of their low cost, abundance, and high performance. The sluggish sulfur reaction and the “shuttle effect” are among the main problems that hinder the commercial utilization of room temperature sodium-sulfur batteries. In this study, the performance of a hybrid that was based on nitrogen (N)-doped carbon nanospheres loaded with a meagre amount of Fe ions (0.14 at.%) was investigated in the sodium-sulfur battery. The Fe ions accelerated the conversion of polysulfides and provided a stronger interaction with soluble polysulfides. The Fe-carbon nanospheres hybrid delivered a reversible capacity of 359 mAh·g−1 at a current density of 0.1 A·g−1 and retained a capacity of 180 mAh·g−1 at 1 A·g−1, after 200 cycles. These results, combined with the excellent rate performance, suggest that Fe ions, even at low loading, are able to improve the electrocatalytic effect of carbon nanostructures significantly. In addition to Na-S batteries, the new hybrid is anticipated to be a strong candidate for other energy storage and conversion applications such as other metal-sulfur batteries and metal-air batteries.

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“…The wide scan XPS spectra shows that the C/O ratio of jute fibers decreases from ≈5.5 to ≈3.8 after coating with GO, due to the presence of oxygen containing functional groups in GO. [ 27,28 ] After rGO coating, C/O ratio increased to ≈7.1, due to the partial restoration of graphene structures, Figure 1b. The high resolution C1s X‐ray photoelectron spectroscopy (XPS) spectrum of untreated jute fibers confirms the presence of three main components: CC bond (≈284.5 eV) in cellulosic structure, COC groups (hydroxyl and epoxy, ≈286.5 eV) and CO groups (carbonyl, ≈288.3 eV), Figure 1c.…”

Section: Resultsmentioning

confidence: 99%

Sustainable and Multifunctional Composites of Graphene‐Based Natural Jute Fibers

Karim

Sarker

Afroj

et al. 2021

Advanced Sustainable Systems

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Smart and sustainable natural fiber‐based composites are of great interest due to their biodegradability, recyclability, and environmental benefits over synthetic fiber composites. In addition, the environmental impact of plastics and synthetic fibers are widespread and substantial, as they can stay in the environment for hundreds of years and contribute significantly to global carbon emissions. Natural fibers such as jute can potentially replace synthetic fibers to manufacture environmentally sustainable, biodegradable, and lightweight composites with improved properties, good thermal and acoustic insulation, and a smaller carbon footprint. However, natural jute fiber‐based composites suffer not only from poor mechanical properties but also being inherently electrically insulating, which limits their applications as multifunctional composites. Here multi‐functional and environmentally sustainable smart composites of graphene‐based natural jute fibers with excellent tensile and interfacial properties are reported. The reduced graphene oxide‐based natural jute fiber enhance the Young's modulus of the composites by ≈450%, and tensile strength by ≈183% after physical and chemical treatment. Such high‐performance composites can also be used as multifunctional smart composites, as demonstrated by effective electro‐magnetic interference shielding performance. This may lead to manufacturing of next generation smart, strong, and sustainable natural fiber composites for high performance engineering applications without conferring environmental problems.

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Electrochemical Activation of Graphene at Low Temperature: The Synthesis of Three-Dimensional Nanoarchitectures for High Performance Supercapacitors and Capacitive Deionization

Cited by 48 publications

References 52 publications

Controlled electrochemical doping of graphene-based 3D nanoarchitecture electrodes for supercapacitors and capacitive deionisation

Controlled electrochemical doping of graphene-based 3D nanoarchitecture electrodes for supercapacitors and capacitive deionisation

Electrocatalytic Assisted Performance Enhancement for the Na-S Battery in Nitrogen-Doped Carbon Nanospheres Loaded with Fe

Sustainable and Multifunctional Composites of Graphene‐Based Natural Jute Fibers

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