Fabrication of Graphene Oxide Supercapacitor Devices

Down, Michael P.; Rowley‐Neale, Samuel J.; Smith, Graham C.; Banks, Craig E.

doi:10.1021/acsaem.7b00164

Cited by 161 publications

(77 citation statements)

References 27 publications

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“…The addition of polymers, namely PPy succeeded in increasing supercapacitor voltage and capacitance compared to carbon which has a smaller voltage and smaller capacitance than GO/PPy (3:10). This is because GO has a large pore with a high surface area wherein the study of Down et al, (2018) GO has a capacitance value of 76 µF in 3M KOH so that the nature of GO supports PPy in maintaining the structure of PPy. The PPy structure has an N group thereby accelerating the transfer of electrons in the GO surface area.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Graphene Oxide/Polypyrrole (GO/PPy) from Used Batteries as Electrodes in Supercapacitor Cells

Qeis

Amanda

Listiani

et al. 2019

Valensi

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Fabrication of graphite-modified GO/PPy composites have been studied from used batteries using the Hummers method. This research was performed in four steps: graphite powder preparation, GO synthesis, GO/PPy composite synthesis, and supercapacitor cell manufacturing. The fabricated GO/PPy composite were characterized using X-Ray Diffraction (XRD) to investigate the characteristic of the diffraction patterns formed by carbon batteries used before and after calcination and Fourier Transform Infra-Red (FTIR) to identify compound functional groups and conduct initial tests in the form of voltage, capacitance and life cycle by measuring charge and discharge times. The graphite preparation stage is carried out by the calcination method at 900°C to produce graphite with an angle of 2θ which is 26° with reflection from (d 002 ). FTIR data showed that GO/PPy composites showed a successful combination of characteristics similar to pure polypyrrole and GO which included a broad absorption band located at 3500-2300 cm -1 which was estimated to be stretching the amine from polypyrrole and O-H group in the GO layer and the emergence of peaks new in the absorption band with a wave number 909 cm -1 is the CN vibration of the polymerized pyrrole. Meanwhile, based on the LCR meter measurement results in the best supercapacitor cells in the sampel GO/PPy ratio (3:10) with voltage value of 74.1 mV; a capacitance value of 15.14 µF and the best charge and discharge times. AbstrakTelah dilakukan pembuatan komposit GO/PPy termodifikasi grafit dari baterai bekas dengan metode Hummers. Penelitian ini dilakukan dalam empat tahap yaitu preparasi serbuk grafit, sintesis GO, sintesis komposit GO/PPy, dan pembuatan sel superkapasitor. Hasil penelitian dikarakterisasi menggunakan X-Ray Diffraction (XRD) untuk melihat karakter dari pola difraksi yang dibentuk oleh serbuk karbon baterai bekas sebelum dan sesudah kalsinasi dan Fourier Transform Infra-Red (FTIR) untuk mengidentifikasi gugus fungsi senyawa serta melakukan pengujian awal berupa tegangan, kapasitansi dan siklus hidup dengan mengukur waktu pengisian dan pengosongan muatan. Tahap preparasi grafit dilakukan dengan metode kalsinasi pada suhu 900°C menghasilkan grafit dengan sudut 2θ yaitu 26° dengan refleksi dari bidang (d 002 ). Data FTIR menunjukkan bahwa komposit GO/PPy memperlihatkan berhasilnya kombinasi karakteristik yang mirip dengan polipirol murni dan GO yang mencakup pita serapan luas yang terletak pada 3500-2300 cm -1 yang diperkirakan ini adalah peregangan amina dari polipirol dan kelompok O-H di lapisan GO serta munculnya puncak baru pada pita serapan dengan bilangan gelombang 909 cm -1 adalah vibrasi C-N dari pirol yang telah terpolimerisasi. Sementara itu, berdasarkan hasil pengukuran LCR meter menghasilkan sel superkapasitor terbaik pada sampel GO/PPy perbandingan (3:10) dengan nilai tegangan 74,1 mV, nilai kapasitansi 15,14 µF dan waktu pengisian serta pengosongan muatan terbaik.Kata kunci: Baterai bekas, komposit GO/PPy, sel superkapasitor.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Graphene Oxide/Polypyrrole (GO/PPy) from Used Batteries as Electrodes in Supercapacitor Cells

Qeis

Amanda

Listiani

et al. 2019

Valensi

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“…During the combustion, some Ni 2 + may react with carbon and get reduced to Ni metal as per Eq. (2).…”

Section: Crystal Structure and Morphologymentioning

confidence: 99%

“…This can be achieved using oxygen electrode catalyst having porous matrix with hydrophobic and hydrophilic pores. For ORR during discharge, the oxygen must enter through the pores of the catalyst and dissolve in electrolyte then undergo reduction to yield O 2 [2][3][4][5][6] . For this reason, the oxygen electrode should have features of hydrophilic environment having fine pores in contact with electrolyte and hydrophobic gas diffusion layer to facilitate fast transport of oxygen towards the atmosphere/electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Cauliflower‐Like Hierarchical Porous Nickel/Nickel Ferrite/Carbon Composite as Superior Bifunctional Catalyst for Lithium‐Air Battery

2020

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Rational design of cost‐effective oxygen electrode catalysts for metal‐air batteries is indispensable for developing next‐generation energy storage devices especially to use in electric vehicles. In this work, non‐precious Nickel/Nickel Ferrite on carbon matrix (NNFOC) nanocomposite as bifunctional air‐breathing electrode for rechargeable Li‐air battery is proposed. The NNFOC composite on rotating ring disc electrode (RRDE) exhibited good oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities. The synergistic contribution from Ni, nickel ferrite and porous carbon network that resulted more reaction sites, high conductivity and fast diffusion pathways, lead to enhanced ORR and OER activities. The CR‐2032 coin‐type and conventional split cell Li‐air battery were fabricated using the NNFOC composite as air‐breathing oxygen electrode and lithium metal as anode. The open‐circuit voltage of the coin cell was invariant for more than 5 days, while the split cell exhibited high discharge capacity of 3820 mAh g‐1 at a current density of 50 mA g‐1. The charged split cell could power a commercial 2.8 V LED bulb for more than 5 h continuously.

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“…GO contains various oxygenated functional groups such as hydroxyl, epoxy, carbonyl, and carboxyl groups. It has found potential applications in super-capacitors [2][3][4], catalysts [5][6][7], and proton conducting membranes in fuel cell or water electrolysis [8][9][10][11]. It was recently demonstrated that GO shows good proton conductivities that are comparable to that of Nafion.…”

Section: Introductionmentioning

confidence: 99%

“…Nyquist plots of GO membranes at different temperatures. a Pristine GO membrane, b modified GO membrane with 0.01 mmol of Al 3+ and c modified GO membrane with 0.01 mmol of La3 …”

mentioning

confidence: 99%

Improving the proton conductivity of graphene oxide membranes by intercalating cations

et al. 2019

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Graphene oxide (GO) membrane has gained increasing attention because of its extraordinary physical and chemical properties and high proton conductivity. GO is rich in oxygenated functional groups, which can support proton transportation. However, pristine GO is unstable at high temperatures due to the removal of oxygen functional groups, resulting in a decrease in the interlayer distance of stacked GO nanosheets. Hence, we propose a modification of GO membranes via the intercalation of cations to enhance the proton conductivity. Modified self-standing GO membranes with Al 3+ and La 3+ were fabricated by a vacuum filtration method. They exhibited a larger distance of the interlayer that serves as proton hopping pathways. Furthermore, the modified GO membrane showed a higher proton conductivity than a pristine GO membrane even at 80 °C, as confirmed by Electrochemical Impedance Spectroscopy. The results demonstrate that intercalating cations in between GO nanosheets is effective in improving the practical feasibility of proton conducting GO membranes.

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Fabrication of Graphene Oxide Supercapacitor Devices

Cited by 161 publications

References 27 publications

Synthesis of Graphene Oxide/Polypyrrole (GO/PPy) from Used Batteries as Electrodes in Supercapacitor Cells

Synthesis of Graphene Oxide/Polypyrrole (GO/PPy) from Used Batteries as Electrodes in Supercapacitor Cells

Cauliflower‐Like Hierarchical Porous Nickel/Nickel Ferrite/Carbon Composite as Superior Bifunctional Catalyst for Lithium‐Air Battery

Improving the proton conductivity of graphene oxide membranes by intercalating cations

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