Free-standing N-Graphene as conductive matrix for Ni(OH)2 based supercapacitive electrodes

Upadhyay, Kush K.; Bundaleska, N.; Abrashev, M. V.; Bundaleski, Nenad; Teodoro, O.M.N.D.; Fonseca, Isabel; Ferro, André Mão de; Silva, Rui Pedro; Tatarova, E.

doi:10.1016/j.electacta.2019.135592

Cited by 35 publications

(34 citation statements)

References 92 publications

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“…The absorption spectrum of the Ar/Ethanol/N 2 outlet gas under the same conditions but without plasma exhibits the peaks characteristic for ethanol molecules, associated with both the O-H at 3200–3500 cm −1 and the C–O stretching vibrations at 1050–1260 cm −1 [ 57 , 58 ]. The plasma completely decomposes the ethanol into the main by-products H 2 and CO [ 41 , 42 ]. Additionally, the spectra of Ar/Ethanol plasma output gas ( p = 2 kW, Q Ar = 1330 sccm, Q Et = 35 sccm) shows increase in the relative intensity of acetylene bands.…”

Section: Resultsmentioning

confidence: 99%

“…However, these analyses were conducted under simplified assumptions, including the harmonic approximation and the formation of completely flat 2D crystalline structures. In practice, free-standing graphene/N-graphene sheets using atmospheric pressure microwave plasma reactor were already synthesized [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. The synthesized substrate-free graphene sheets show both good mechanical and chemical stability, due to the curled nature of the structures.…”

Section: Introductionmentioning

confidence: 99%

“…The work is a continuation of the research carried out within the framework of plasma-based synthesis of advanced 2D nanostructures, which includes graphene [ 32 , 33 , 34 , 35 , 37 ] and N-graphene [ 39 , 40 ] syntheses using various precursors. The synthesized nanostructures have been tested as low secondary yield coating materials [ 38 ] and as conductive matrix for Ni (OH) 2 -based supercapacitive electrodes [ 41 ]. In the present work, the feasibility of N 2 gas as a graphene doping agent is experimentally and theoretically investigated.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Synthesis and Nitrogen Doping of Free-Standing Graphene Applying Microwave Plasma

et al. 2020

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An experimental and theoretical investigation on microwave plasma-based synthesis of free-standing N-graphene, i.e., nitrogen-doped graphene, was further extended using ethanol and nitrogen gas as precursors. The in situ assembly of N-graphene is a single-step method, based on the introduction of N-containing precursor together with carbon precursor in the reactive microwave plasma environment at atmospheric pressure conditions. A previously developed theoretical model was updated to account for the new reactor geometry and the nitrogen precursor employed. The theoretical predictions of the model are in good agreement with all experimental data and assist in deeper understanding of the complicated physical and chemical process in microwave plasma. Optical Emission Spectroscopy was used to detect the emission of plasma-generated ‘‘building units’’ and to determine the gas temperature. The outlet gas was analyzed by Fourier-Transform Infrared Spectroscopy to detect the generated gaseous by-products. The synthesized N-graphene was characterized by Scanning Electron Microscopy, Raman, and X-ray photoelectron spectroscopies.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simultaneous Synthesis and Nitrogen Doping of Free-Standing Graphene Applying Microwave Plasma

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“…4e). For all the samples, a small equivalent series resistance (ESR, intersection with the real axis) of~1.6 Ω demonstrates low interface resistance on the surface between the electrode and electrolyte, and a fast ionic conductivity of the electrolyte [49]. Moreover, in the low-frequency region, 5% rGO-Ni(OH) 2 has a large slope, showing the low Warburg impedance (Z w ) of the diffusion of ions near the surface of the electrode.…”

Section: Science China Materialsmentioning

confidence: 97%

“…The large capacitance of 3% rGO-Ni(OH) 2 (1370.9 F g −1 ) and 7% rGO-Ni(OH) 2 (1347.28 F g −1 ) can also confirm the synergy between the ultrathin Ni(OH) 2 -NS and rGO, which is highly conducive to the charge transport and ion diffusion. Moreover, the high mechanical strength of the rGO also buffers the structural damage in the fast charge and discharge cycles, which is favorable to the stability [33,48,49]. Fig.…”

Section: Electrochemical Performance Of the Rgo-ni(oh) 2 Composites Imentioning

confidence: 99%

Ultrathin Ni(OH)2 layer coupling with graphene for fast electron/ion transport in supercapacitor

et al. 2020

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Integration of fast electrochemical double-layer capacitance and large pseudocapacitance is a practical way to improve the overall capability of supercapacitor, yet remains challenging. Herein, an effective cyanogel synthetic strategy was demonstrated to prepare ultrathin Ni(OH) 2 nanosheets coupling with conductive reduced graphene oxide (rGO) (rGO-Ni(OH) 2) at ambient condition. Ultrathin Ni(OH) 2 nanosheet with 3-4 layers of edge-sharing octahedral MO 6 maximally exposes the active surface of Faradic reaction and promotes the ion diffusion, while the conductive rGO sheet boosts the electron transport during the reaction. Even at 30 A g −1 , the optimal sample can deliver a specific capacitance of 1119.52 F g −1 , and maintain 82.3% after 2000 cycles, demonstrating much higher electrochemical capability than bare Ni(OH) 2 nanosheets. A maximum specific energy of 44.3 W h kg −1 (148.5 W kg −1) is obtained, when assembled in a two-electrode system rGO-Ni(OH) 2 //rGO. This study provides an insight into efficient construction of two-dimensional hybrid electrodes with high performance for the new-generation energy storage system.

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Advance in Using Plasma Technology for Modification or Fabrication of Carbon‐Based Materials and Their Applications in Environmental, Material, and Energy Fields

Sun

Bao

et al. 2020

Adv Funct Materials

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Plasma technology is an eco‐friendly way to modify or fabricate carbon‐based materials (CBMs) due to plasmas’ distinctive abilities in tuning the surface physicochemical properties by implanting functional groups or incorporating heteroatoms into the surface without changing the bulk structure. However, the mechanisms of functional groups formation on the carbon surface are still not clearly explained because of the variety of different discharge conditions and the complexity of plasma chemistry. Consequently, this paper contains a comprehensive review of plasma‐treated carbon‐based materials and their applications in environmental, materials, and energy fields. Plasma‐treated CBMs used in these fields have been significantly enhanced in recent years because these related materials possess unique features after plasma treatment, such as higher adsorption capacity, enhanced wettability, improved electrocatalytic activity, etc. Meanwhile, this paper also summarizes possible reaction routes for the generation of functional groups on CBMs. The outlook for future research is summarized, with suggestions that plasma technology research and development shall attempt to achieve precise control of plasmas to synthesize or to modify CBMs at the atomic level.

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Free-standing N-Graphene as conductive matrix for Ni(OH)2 based supercapacitive electrodes

Cited by 35 publications

References 92 publications

Simultaneous Synthesis and Nitrogen Doping of Free-Standing Graphene Applying Microwave Plasma

Simultaneous Synthesis and Nitrogen Doping of Free-Standing Graphene Applying Microwave Plasma

Ultrathin Ni(OH)2 layer coupling with graphene for fast electron/ion transport in supercapacitor

Advance in Using Plasma Technology for Modification or Fabrication of Carbon‐Based Materials and Their Applications in Environmental, Material, and Energy Fields

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