Graphene material preparation through thermal treatment of graphite oxide electrochemically synthesized in aqueous sulfuric acid

Gurzęda, Bartosz; Buchwald, Tomasz; Nocuń, Marek; Bąkowicz, A.; Krawczyk, Piotr

doi:10.1039/c7ra01678f

Cited by 96 publications

(49 citation statements)

References 51 publications

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“…[17] Then, air calcination (Step 2) further increases the oxygen and defect content and changes the distribution/components of the OFGs on the surface. [25] The gaseous oxidation of a graphitic surface preferentially occurs at the edge or defective sites. [26] The abundant OFGs formed during Step 1 can offer more defective sites to facilitate the oxidation process of Step 2.…”

Section: Resultsmentioning

confidence: 99%

“…During this step, strongly electrophilic NO 2 + in the mixed acid (H 2 SO 4 + HNO 3 ) solution is generated, and electrophilic attack integrates the CC surface . Then, air calcination (Step 2) further increases the oxygen and defect content and changes the distribution/components of the OFGs on the surface . The gaseous oxidation of a graphitic surface preferentially occurs at the edge or defective sites .…”

Section: Resultsmentioning

confidence: 99%

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Two‐Step Activated Carbon Cloth with Oxygen‐Rich Functional Groups as a High‐Performance Additive‐Free Air Electrode for Flexible Zinc–Air Batteries

Kordek

Jiang

Fan

et al. 2018

Advanced Energy Materials

194

155

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A flexible air electrode (FAE) with both high oxygen electrocatalytic activity and excellent flexibility is the key to the performance of various flexible devices, such as Zn-air batteries. A facile two-step method, mild acid oxidation followed by air calcination that directly activates commercial carbon cloth (CC) to generate uniform nanoporous and super hydrophilic surface structures with optimized oxygen-rich functional groups and an enhanced surface area, is presented here. Impressively, this two-step activated CC (CC-AC) exhibits superior oxygen electrocatalytic activity and durability, outperforming the oxygen-doped carbon materials reported to date. Especially, CC-AC delivers an oxygen evolution reaction (OER) overpotential of 360 mV at 10 mA cm −2 in 1 m KOH, which is among the best performances of metal-free OER electrocatalysts. The practical application of CC-AC is presented via its use as an FAE in a flexible rechargeable Zn-air battery. The bendable battery achieves a high open circuit voltage of 1.37 V, a remarkable peak power density of 52.3 mW cm −3 at 77.5 mA cm −3 , good cycling performance with a small chargedischarge voltage gap of 0.98 V and high flexibility. This study provides a new approach to the design and construction of high-performance selfsupported metal-free electrodes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Two‐Step Activated Carbon Cloth with Oxygen‐Rich Functional Groups as a High‐Performance Additive‐Free Air Electrode for Flexible Zinc–Air Batteries

Kordek

Jiang

Fan

et al. 2018

Advanced Energy Materials

194

155

View full text Add to dashboard Cite

show abstract

“…S1a † could be explained by the fact that oxidation of graphite resulted in oxygen intercalation into layer spacing to change topological structure of graphitic or cause vacancy defects in the carbon lattice. 39 When voltage is applied to graphite, graphite sheets peel off and this exfoliation process produces very thin graphitic akes, which in some cases consist of nanoparticles or a single atomic layer. The mechanism by which oxygen can be incorporated into a graphene layer to form graphene oxide is relatively well known, in which oxidation results in the formation of epoxy and hydroxyl groups.…”

Section: Characterization Of Cnpsmentioning

confidence: 99%

Highly hydrophilic carbon nanoparticles: uptake mechanism by mammalian and plant cells

Chen

Wang

et al. 2018

RSC Adv.

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“…The MGO sheets exhibited a broad XRD peak of (001), indicating the beginning of the collapse in the well-ordered interlayer of the LGO sheets during the ultrasonication for 6 h [ 24 ]. After excessive ultrasonication for 24 h, the broken interlayer of the SGO sheets was confirmed by the unclear XRD peaks of (001) and (002) [ 25 , 26 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of the Two-Dimensional Magnetostrictive Fillers of CoFe2O4-Intercalated Graphene Oxide Sheets in 3-2 Type Poly(vinylidene fluoride)-Based Magnetoelectric Films

Baek

Yang

2021

Polymers

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In the last decade, magnetoelectric (ME) polymer films have been developed by including zero-dimensional or one-dimensional magnetostrictive fillers in a piezoelectric polymer matrix. Existing reports on ME polymer films reveal that the shape of the magnetostrictive fillers is a critical determinant of the polymeric phase conformation, strain transfer between the piezoelectric and magnetostrictive phases, and dipole alignment in the films. In this study, to investigate the effect of two-dimensional (2D) magnetostrictive fillers on piezoelectric, magnetic, and magnetoelectric responses, 3-2 type ME films were prepared using CoFe2O4-intercalated graphene oxide (CFO-i-GO) fillers and poly(vinylidene fluoride) (PVDF) polymers. The 2D fillers of CFO-i-GO were hydrothermally synthesized by CFO intercalation into the interlayers of GO sheets with different lateral sizes, which were controlled by ultrasonication treatment. It was found that the large-lateral-size GO (LGO), medium-lateral-size GO (MGO), and small-lateral-size GO (SGO) fillers in the PVDF-based ME films exhibited a lateral size effect on CFO intercalation, polymeric phase conformation, dipole alignment, and magnetoelectric responses. A maximum ME coefficient (αME) of 3.0 mV/cm∙Oe was achieved with a strong linearity (r2) of 0.9992 at an off-resonance frequency (f) of 1 kHz and applied direct current (dc) magnetic field (Hdc) of ± 1000 Oe. The 3-2 type polymer-based ME films with reliable ME responses have potential for use in high-feasibility ME devices for biomedical sensing applications.

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Graphene material preparation through thermal treatment of graphite oxide electrochemically synthesized in aqueous sulfuric acid

Abstract: The present work demonstrates a simple and low-cost method to produce bulk quantities of graphene material through the thermal treatment of graphite oxide (GO).

Cited by 96 publications

References 51 publications

Two‐Step Activated Carbon Cloth with Oxygen‐Rich Functional Groups as a High‐Performance Additive‐Free Air Electrode for Flexible Zinc–Air Batteries

Two‐Step Activated Carbon Cloth with Oxygen‐Rich Functional Groups as a High‐Performance Additive‐Free Air Electrode for Flexible Zinc–Air Batteries

Highly hydrophilic carbon nanoparticles: uptake mechanism by mammalian and plant cells

Effect of the Two-Dimensional Magnetostrictive Fillers of CoFe2O4-Intercalated Graphene Oxide Sheets in 3-2 Type Poly(vinylidene fluoride)-Based Magnetoelectric Films

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