Sulphur-reduced graphene oxide composite with improved electrochemical performance for supercapacitor applications

Tarimo, Delvina Japhet; Oyedotun, Kabir O.; Mirghni, Abdulmajid Abdallah; Manyala, Ncholu I.

doi:10.1016/j.ijhydene.2020.03.059

Cited by 38 publications

(23 citation statements)

References 44 publications

(92 reference statements)

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“…GO was prepared using the modified Hummer’s method [ 10 ]. Graphite powder was slowly added into a cooled H 2 SO 4 and stirred until it reached homogeneity.…”

Section: Methodsmentioning

confidence: 99%

“…Alternatively, there are cheaper and more simple ways to mass produce a slightly defective graphene, such as atmospheric pressure chemical vapor deposition (AP-CVD) [ 8 , 9 ]. The chemical phase exfoliation via the Hummer’s method of graphite oxide has been widely used, but this method produces a highly oxidized version of graphene [ 5 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

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Novel Thermally Reduced Graphene Oxide Microsupercapacitor Fabricated via Mask—Free AxiDraw Direct Writing

et al. 2021

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We demonstrate a simple method to fabricate all solid state, thermally reduced Graphene Oxide (TRGO) microsupercapacitors (µ-SCs) prepared using the atmospheric pressure chemical vapor deposition (APCVD) and a mask-free axiDraw sketching apparatus. The Fourier transform infrared spectroscopy (FTIR) shows the extermination of oxygen functional groups as the reducing temperature (RT) increases, while the Raman shows the presence of the defect and graphitic peaks. The electrochemical performance of the µ-SCs showed cyclic voltammetry (CV) potential window of 0–0.8 V at various scan rates of 5–1000 mVs−1 with a rectangular shape, depicting characteristics of electric double layer capacitor (EDLC) behavior. The µ-SC with 14 cm−2 (number of digits per unit area) showed a 46% increment in capacitance from that of 6 cm−2, which is also higher than the µ-SCs with 22 and 26 cm−2. The TRGO-500 exhibits volumetric energy and power density of 14.61 mW h cm−3 and 142.67 mW cm−3, respectively. The electrochemical impedance spectroscopy (EIS) showed the decrease in the equivalent series resistance (ESR) as a function of RT due to reduction of the resistive functional groups present in the sample. Bode plot showed a phase angel of −85° for the TRGO-500 µ-SC device. The electrochemical performance of the µ-SC devices can be tuned by varying the RT, number of digits per unity area, and connection configuration (parallel or series).

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“…GO was prepared using the modified Hummer’s method [ 10 ]. Graphite powder was slowly added into a cooled H 2 SO 4 and stirred until it reached homogeneity.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Thermally Reduced Graphene Oxide Microsupercapacitor Fabricated via Mask—Free AxiDraw Direct Writing

et al. 2021

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“…RGO‐S was produced using the procedure conveyed in our previous work 27 . A 25 mg of RGO‐S was then sonicated in DI water for 12 hours.…”

Section: Methodsmentioning

confidence: 99%

Two‐step electrodeposition of Hausmannite sulphur reduced graphene oxide and cobalt‐nickel layered double hydroxide heterostructure for high‐performance supercapacitor

Rutavi

Tarimo

Maphiri

et al. 2022

Intl J of Energy Research

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Summary Hausmannite/sulphur reduced graphene oxide (MO/RGO‐S) and cobalt‐nickel layered double hydroxide (CN) composite was synthesized through a two‐step electrodeposition approach. This process began with galvanostatic electrodeposition of MO/RGO‐Son a nickel foam, followed by cyclic voltammetry electrodeposition of CN. The inclusion of RGO‐S increases the electrical conductivity of the active material (AM) and its wettability while Mn3O4 (MO) enhances the pseudocapacitive active sites which help to increase the specific capacity of CN. The materials' electrochemical evaluations were carried out via three‐ and two‐electrode configurations using 2 M KOH electrolyte. An enhanced composite material (MO/RGO‐S‐50@CN) produced a phenomenal specific capacity of 582.1 mA h g−1 in a three‐electrode configuration at 0.5 A g−1. The device (MO/RGO‐S‐50@CN//CCBW) consisting of MO/RGO‐S‐50@CN and activated carbon from cooked chicken bone waste (CCBW) as positive and negative electrodes, respectively delivered specific energy of 56.0 Wh kg−1 with a specific power of 515.0 W kg−1 at a specific current of 0.5 A g−1. The device produced capacity retention of 85.1% and coulombic efficiency of 99.7% at 10 000 galvanostatic charge‐discharges cycles at 6 A g−1. Because of these excellent results, the fabricated materials demonstrated great potential for application as a high specific energy supercapacitor.

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“…al. [57] prepared sulfur-reduced GO (RGOÀ S) using the Hummers' method. The electrochemical performance of the RGOÀ S as a promising SC electrode revealed a specific capacity of 113.8 mAh g À 1 at a current density of 0.5 A g À 1 in a 6 m KOH electrolyte.…”

Section: Performance Evaluation Of S-doped Carbon For Scsmentioning

confidence: 99%

“…Sulfur is known as one of the highest reactive elements for heteroatom doping because of its unpaired electrons, wider bandgap due to its electron-withdrawing character, a slight difference in electronegativity with carbon [electronegativity of sulfur (2.58) and carbon (2.55)], and easily polarizable nature. [57,58] A series of faradaic redox reactions occur on S-doped carbonaceous electrodes, leading to increased pseudocapacitance. [59] Sulfur can be found in the effluents of a range of industries, including leather tanning, petroleum, and natural gas.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Sulfur‐doped Carbon for Supercapacitor Applications: A Review

et al. 2021

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als-based SCs have demonstrated enhanced surface wettability, improved conductivity, and induced pseudocapacitance effect, thereby delivering improved specific energy and specific power. Many reports on S-doped carbon for SC applications have been published, but there is no specific Review on the preparation of S-doped carbon for SC applications. This Review focuses on recent developments in the field of SC electrodes made from Sdoped carbon materials. Herein, the preparation methods and applications of S-doped carbon for SCs were summarized following a brief discussion of different electrochemical characterization techniques of SCs. Finally, the challenges of S-doped carbon materials and their potential prospects were discussed to give crucial insights into the favorable factors for future innovations of SC electrodes. This Review aims to provide insight for further research on the preparation of S-doped carbon for electrochemical energy storage applications.

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Sulphur-reduced graphene oxide composite with improved electrochemical performance for supercapacitor applications

Cited by 38 publications

References 44 publications

Novel Thermally Reduced Graphene Oxide Microsupercapacitor Fabricated via Mask—Free AxiDraw Direct Writing

Novel Thermally Reduced Graphene Oxide Microsupercapacitor Fabricated via Mask—Free AxiDraw Direct Writing

Two‐step electrodeposition of Hausmannite sulphur reduced graphene oxide and cobalt‐nickel layered double hydroxide heterostructure for high‐performance supercapacitor

Preparation of Sulfur‐doped Carbon for Supercapacitor Applications: A Review

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