Recent trends in graphene supercapacitors: from large area to microsupercapacitors

Velasco, Andrés; Ryu, Yu Kyoung; Boscá, Alberto; Ladrón-de-Guevara, Antonio; Hunt, Elijah; Zuo, Jian‐Min; Pedrós, J.; Calle, F.; Martínez, Javier López

doi:10.1039/d0se01849j

Cited by 131 publications

(65 citation statements)

References 181 publications

(204 reference statements)

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“…For creating such fingers patterns SC, lithography techniques are used as it's a matter of certain dimensions etching processing. Photolithography, screen printing, laser dry etching and lift-off processing are used to fabricate complicated SCs designs [46]. However, most of SCs active material will be affected by exposure to chemicals and multi-processing steps which will not match the easy-to-fabricated principle.…”

Section: D Rgo Sc With Laser Irradiationmentioning

confidence: 99%

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Graphene Functionalization towards Developing Superior Supercapacitors Performance

Elhamid¹,

Shawkey²,

Khalil³

et al. 2022

Supercapacitors for the Next Generation

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Graphene is known as the miracle material of the 21st century for the wide band of participating applications and epic properties. Unlike the CVD monolayer graphene, Reduced graphene oxide (RGO) is a commercial form with mass production accessibility via numerous numbers of methods in preparation and reduction terms. Such RGO form showed exceptional combability in supercapacitors (SCs) where RGO is participated to promote flexibility, lifetime and performance. The chapter will illustrate 4 critical milestones of using graphene derivatives for achieving SC’s superior performance. The first is using oxidized graphene (GO) blind with polymer for super dielectric spacer. The other three types are dealing with electrolytic SCs based on RGO. Polyaniline (PANI) was grown on GO for exceptionally stable SCs of 100% retention. Silver decoration of RGO was used for all-solid-state printable device. The solid-state gel electrolyte was developed by adding GO to promote current rating. Finally, laser reduced graphene is presented as a one-step and versatile technique for micropatterning processing. The RGO reduction was demonstrated from a laser GO interaction perspective according to two selected key parameters; wavelength and pulse duration.

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Section: D Rgo Sc With Laser Irradiationmentioning

confidence: 99%

“…• The strong cold processing in not effective in restoring graphene-like structure and related electric properties. technique (LDWT) that enables fast, low cost, easy-processing and maskless patterning [46]. Laser processing of SCs is accessible for most of available rigid and flexible substrates.…”

Section: Pulsed Femtosecond 800 Nmmentioning

confidence: 99%

Graphene Functionalization towards Developing Superior Supercapacitors Performance

Elhamid¹,

Shawkey²,

Khalil³

et al. 2022

Supercapacitors for the Next Generation

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“…Graphene is the thinnest and strongest material having a two-dimensional (2D) structure with sp 2hybridized carbons [1][2][3]. The material based on graphene has been widely utilized in support of several advanced purposes namely Li-ion batteries, Supercapacitors, etc [4][5][6][7][8][9][10][11][12][13][14][15]. For the synthesis of GO, various synthesis methods in particular thermal reduction [16], chemical reduction [17], electrochemical reduction [18] have been used.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Graphene Oxide and its reduction with different reducing agents

Bansal

Singh

Dhaliwal

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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-The present work reports the simplistic formation of graphene oxide (GO) and reduced graphene oxide (rGO) by oxidizing graphite powder with the 9:1 volume combination of concentrated sulfuric acid/and ortho-phosphoric acid (H2SO4/H3PO4) in the company of KMnO4 as an oxidant. The acid combination solution of H2SO4/H3PO4 produces the improved oxidized hydrophilic GO without any evolution of hazardous gases instead of only H2SO4, which differentiates this procedure from the Hummers’ method. Then, the synthesized GO is diminished to rGO by employing various reducers namely hydrazine hydrate, sodium borohydride and, ascorbic acid through the chemical route. The properties of synthesized materials have been investigated by diverse investigative systems that are X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Raman spectroscopy and, Energy Dispersive X-ray spectroscopy (EDS) which approved its high crystallinity and reduction of GO into rGO. EDS analysis confirms that the carbon to oxygen ratio is higher in rGO prepared by using hydrazine hydrate in comparison to rGO made by using sodium borohydride and ascorbic acid which reveals the good reducing capability of hydrazine hydrate. Hence, it may be concluded that the rGO synthesized by the reduction of GO in the presence of hydrazine hydrate is better as compared to others and it is expected that the synthesized material may be used for various applications.

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“…Graphene is a special sp 2 bonded carbon allotrope, which has drawn great attention in the scientific world during the last decade. This is coming from its unique application potential in the fields of nanoelectronics [ 14 ], capacitors [ 15 ] and sensors [ 16 , 17 ]. Nonetheless, pure graphene with no band-gap displayed limited electro-catalytic activity due to the deficient number of active sites.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Nitrogen, Boron Co-Doped Graphene with Enhanced Electro-Catalytic Activity for Cymoxanil Detection

Varodi

Pogăcean

Coroș

et al. 2021

Sensors

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A sample of nitrogen and boron co-doped graphene (NB-Gr) was obtained by the hydrothermal method using urea and boric acid as doping sources. According to XRD analysis, the NB-Gr sample was formed by five-layer graphene. In addition, the XPS analysis confirmed the nitrogen and boron co-doping of the graphene sample. After synthesis, the investigation of the electro-catalytic properties of the bare (GC) and graphene-modified electrode (NB-Gr/GC) towards cymoxanil detection (CYM) was performed. Significant differences between the two electrodes were noticed. In the first case (GC) the peak current modulus was small (1.12 × 10−5 A) and appeared in the region of negative potentials (−0.9 V). In contrast, when NB-Gr was present on top of the GC electrode it promoted the transfer of electrons, leading to a large peak current increase (1.65 × 10−5 A) and a positive shift of the peak potential (−0.75 V). The NB-Gr/GC electrode was also tested for its ability to detect cymoxanil from a commercial fungicide (CURZATE MANOX) by the standard addition method, giving a recovery of 99%.

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Recent trends in graphene supercapacitors: from large area to microsupercapacitors

Abstract: Supercapacitors are being increasingly used as energy storage systems. Graphene, with its huge specific surface area, superior mechanical flexibility and outstanding electrical properties, constitutes an ideal candidate for the next...

Cited by 131 publications

References 181 publications

Graphene Functionalization towards Developing Superior Supercapacitors Performance

Graphene Functionalization towards Developing Superior Supercapacitors Performance

Synthesis and characterization of Graphene Oxide and its reduction with different reducing agents

Hydrothermal Synthesis of Nitrogen, Boron Co-Doped Graphene with Enhanced Electro-Catalytic Activity for Cymoxanil Detection

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