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Rate constants of C5F10O decomposition reactions at temperatures of 300-3500 K EI SCIE
期刊论文 | 2019 , 52 (3) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
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Abstract :

Five-carbon perfluorinated ketone (C5F10O) has been reported as a remarkable eco-efficient replacement for SF6. To investigate its dielectric strength, thermodynamic properties and decomposition characteristics, accurate compositions of C5F10O discharge plasma arc a prerequisite and can be studied by a chemical kinetic model considering non-equilibrium effects. Rate constants of C5F10O decomposition reactions are the basis for this model but have not been reported yet. Therefore, this paper is devoted to investigating the rate constants of C5F10O decomposition reactions at temperatures of 300-3500K, relevant to electrical breakdown and arc-quenching in high-voltage electrical equipment. The rate constants and equilibrium constants as the function of temperature are computed using the transition state theory on the basis of energies and vibrational frequencies, calculated by the B3LYP/6311G(d,p) method. The dominant reactions generating and/or consuming the species in C5F10O decomposition are also selected by contributions higher than 1%. The results in this paper show that (1) C5F10O decomposition reactions (except for R7) are endothermic and rate constants differ significantly between different reactions, mainly caused by activation energies; (2) at 1500K and above, most rate constants fall in the region from 10(-15) to 10(30) cm(3) mole(-1) s(-1) or s(-1), making it so that the corresponding reactions cannot be neglected in C5F10O plasma models; (3) reactions R5, R11, R12, R14, R29, R32, R33 and R36 mainly contribute to the degradation of the insulating and arc-quenching performance of C5F10O; (4) reaction R2 plays the major role in C5F10O dissociation with the contribution more than 72.2% at temperatures of 300-3500K. To verify the method adopted, thermodynamic properties (entropy, enthalpy and specific heat) of CF2, CF2 CF2, CF3, CF-CF2 and CO are compared with those from NIST-JANAF tables and a good agreement is obtained. This work is expected to provide the input data for the calculation of non-equilibrium C5F10O discharge plasma compositions employing a chemical kinetic model.

Keyword :

transition state theory rate constants alternative gas for SF6 plasma composition C5F10O

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GB/T 7714 Fu, Yuwei , Rang, Mingzhe , Wang, Xiaohua et al. Rate constants of C5F10O decomposition reactions at temperatures of 300-3500 K [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2019 , 52 (3) .
MLA Fu, Yuwei et al. "Rate constants of C5F10O decomposition reactions at temperatures of 300-3500 K" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 52 . 3 (2019) .
APA Fu, Yuwei , Rang, Mingzhe , Wang, Xiaohua , Yang, Aijun . Rate constants of C5F10O decomposition reactions at temperatures of 300-3500 K . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2019 , 52 (3) .
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The varying characteristics of C5F10O decomposition components at 300 K-3500 K with a chemical kinetic model SCIE
期刊论文 | 2019 , 9 (1) | AIP ADVANCES
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The variation characteristics of C5F10O decomposition components at 300 K - 3500 K are studied with a chemical kinetic model considering neutral reactions. Three chemical kinetic models of SF6 breakdown are built to verify the model adopted (model C) and the results show that ion/electron participated reactions slightly change the molar fractions, which are lower than 10(-14) with little influence on the insulating performance of SF6. Therefore, model C is reasonable to study the varying characteristics of C5F10O decomposition components and thus the molar fractions of C5F10O decomposition products under different temperature decreasing curves and pressures are calculated. The results show that the molar fraction of C5F10O grows to approximately one as temperature declining to 1,500 K and the temperature decreasing rates have similar affects on the relaxation time of the reactions generating C5F10O. And high pressure promotes species recombining to C5F10O by increasing the molar fractions of C5F10O decomposition components. The results can be used to evaluate C5F10O insulating performance. (C) 2019 Author(s).

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GB/T 7714 Fu, Yuwei , Wang, Xiaohua , Yang, Aijun et al. The varying characteristics of C5F10O decomposition components at 300 K-3500 K with a chemical kinetic model [J]. | AIP ADVANCES , 2019 , 9 (1) .
MLA Fu, Yuwei et al. "The varying characteristics of C5F10O decomposition components at 300 K-3500 K with a chemical kinetic model" . | AIP ADVANCES 9 . 1 (2019) .
APA Fu, Yuwei , Wang, Xiaohua , Yang, Aijun , Rong, Mingzhe . The varying characteristics of C5F10O decomposition components at 300 K-3500 K with a chemical kinetic model . | AIP ADVANCES , 2019 , 9 (1) .
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Time-frequency analysis of PD-induced UHF signal in GIS and feature extraction using invariant moments EI SCIE Scopus
期刊论文 | 2018 , 12 (2) , 169-175 | IET SCIENCE MEASUREMENT & TECHNOLOGY
WoS CC Cited Count: 2 SCOPUS Cited Count: 4
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Abstract :

The ultra-high-frequency (UHF) method is efficient in partial discharges (PDs) detection in gas-insulated switchgear (GIS). The features extraction of UHF signals is significant for propagation characteristics analysis and PD pattern classification. The PD-induced UHF signals are acquired by the internal UHF sensors in an actual 252kV L-shaped GIS. The short-time Fourier transform method is applied to process UHF signals and describe the propagation characteristics in L-shaped GIS. Hu's invariant moments of energy density distribution are extracted as features in time-frequency plane. The features are utilised to discriminate different PD defect patterns in actual GIS model by the support vector machine classifier and achieve good results. Finally, a novel system of features extraction and classification of UHF signals is summarised.

Keyword :

partial discharge detection feature extraction short-time Fourier transform method signal detection Time-frequency analysis UHF measurement partial discharge measurement UHF detectors PD-induced UHF signal acquisition voltage 252 kV UHF signal processing gas insulated switchgear time-frequency analysis internal UHF sensor L-shaped GIS UHF signal classification PD-induced UHF signal detection PD pattern classification Hu invariant moment energy density distribution extraction gas-insulated switchgear support vector machine classifier Fourier transforms signal classification ultrahigh-frequency method propagation characteristics analysis support vector machines

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GB/T 7714 Li, Xi , Wang, Xiaohua , Xie, Dingli et al. Time-frequency analysis of PD-induced UHF signal in GIS and feature extraction using invariant moments [J]. | IET SCIENCE MEASUREMENT & TECHNOLOGY , 2018 , 12 (2) : 169-175 .
MLA Li, Xi et al. "Time-frequency analysis of PD-induced UHF signal in GIS and feature extraction using invariant moments" . | IET SCIENCE MEASUREMENT & TECHNOLOGY 12 . 2 (2018) : 169-175 .
APA Li, Xi , Wang, Xiaohua , Xie, Dingli , Wang, Xinqiao , Yang, Aijun , Rong, Mingzhe . Time-frequency analysis of PD-induced UHF signal in GIS and feature extraction using invariant moments . | IET SCIENCE MEASUREMENT & TECHNOLOGY , 2018 , 12 (2) , 169-175 .
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Recent advances in phosphorene as a sensing material EI SCIE Scopus
期刊论文 | 2018 , 20 , 13-32 | NANO TODAY
WoS CC Cited Count: 4 SCOPUS Cited Count: 7
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Abstract :

A monolayer of black phosphorus (BP), also called phosphorene, is an emerging member of the family of two-dimensional (2D) materials. It has sparked a surge of research activities in material science since its first preparation by mechanical exfoliation in 2014. Several reviews have focused on the structure and anisotropic properties of phosphorene as well as its applications in transistors, batteries, and solar cells. Compared to graphene and transition metal dichalcogenides (TMD5), phosphorene possesses higher surface to volume ratio due to its "puckered" lattice structure and has presented some unique advantages in sensing applications. This review aims to summarize recent developments in the sensing applications of phosphorene, including gas sensing, humidity sensing, photo-detection, bio-sensing and ion sensing. The article concludes with the current challenges and future prospects for the production and sensing applications of phosphorene. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Sensing performances Sensing applications Phosphorene

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GB/T 7714 Yang, Aijun , Wang, Dawei , Wang, Xiaohua et al. Recent advances in phosphorene as a sensing material [J]. | NANO TODAY , 2018 , 20 : 13-32 .
MLA Yang, Aijun et al. "Recent advances in phosphorene as a sensing material" . | NANO TODAY 20 (2018) : 13-32 .
APA Yang, Aijun , Wang, Dawei , Wang, Xiaohua , Zhang, Dongzhi , Koratkar, Nikhil , Rong, Mingzhe . Recent advances in phosphorene as a sensing material . | NANO TODAY , 2018 , 20 , 13-32 .
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Laser-induced plasma imaging for low-pressure detection EI SCIE Scopus
期刊论文 | 2018 , 26 (12) , 15962-15971 | OPTICS EXPRESS
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Abstract :

A novel technique based on laser induced plasma imaging is proposed to measure residual pressure in sealed containers with transparent walls, e.g. high voltage vacuum interrupter in this paper. The images of plasma plumes induced on a copper target at pressure of ambient air between 10(-2)Pa and 10(5)Pa were acquired at delay times of 200ns, 400ns, 600ns and 800ns. All the plasma images at specific pressures and delay times showed a good repeatability. It was found that ambient gas pressure significantly affects plasma shape, plasma integral intensities and expansion dynamics. A subsection characteristic method was proposed to extract pressure values from plasma images. The method employed three metrics for identification of high, intermediate and low pressures: the distance between the target and plume center, the integral intensity of the plume, and the lateral size of the plume, correspondingly. The accuracy of the method was estimated to be within 15% of nominal values in the entire pressure range between 10-2Pa and 105Pa. The pressure values can be easily extracted from plasma images in the whole pressure range, thus making laser induced plasma imaging a promising technique for gauge-free pressure detection. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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GB/T 7714 Yuan, H. , Gornushkin, Igor B. , Gojani, Ardian B. et al. Laser-induced plasma imaging for low-pressure detection [J]. | OPTICS EXPRESS , 2018 , 26 (12) : 15962-15971 .
MLA Yuan, H. et al. "Laser-induced plasma imaging for low-pressure detection" . | OPTICS EXPRESS 26 . 12 (2018) : 15962-15971 .
APA Yuan, H. , Gornushkin, Igor B. , Gojani, Ardian B. , Wang, X. H. , Rong, M. Z. . Laser-induced plasma imaging for low-pressure detection . | OPTICS EXPRESS , 2018 , 26 (12) , 15962-15971 .
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Combined Diffusion Coefficients in CO2 Thermal Plasmas Contaminated with Cu, Fe or Al EI SCIE Scopus
期刊论文 | 2018 , 38 (5) , 1133-1149 | PLASMA CHEMISTRY AND PLASMA PROCESSING
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Abstract :

Our work aims at the computation of combined diffusion coefficients in CO2-metal (Cu, Fe, Al) mixtures at a temperature interval of 2000-30,000 K at 0.1 MPa and aims at the investigation of the impact of the concentration and nature of metal vapor (Cu, Fe, Al) on diffusion phenomena. The combined diffusion coefficients have four components, more specifically, combined ordinary diffusion coefficient, combined electric field diffusion coefficient, combined temperature diffusion coefficient and combined pressure diffusion coefficient due to the gradients of the species densities, applied electrical field temperature and pressure. The results indicate that, for Cu and Fe, the combined diffusion coefficients are quite identical under the condition of same metal concentrations (1 and 10% mass concentration). Compared with Cu and Fe under the same metal concentrations (1 and 10%), Al results in a larger enhancement of combined electric field and ordinary diffusion coefficients while smaller enhancement of combined temperature diffusion coefficients. All the combined diffusion coefficients exhibit an upward trend with metal concentrations except for combined electric field, temperature and pressure diffusion coefficients. These three mentioned coefficients are attenuated by the metal vapor above the certain concentration such as, in the case of combined temperature diffusion coefficients, 70% Cu, 70% Fe and 50% Al for CO2-Cu, CO2-Fe and CO2-Al mixtures respectively. Namely, compared with Cu and Fe, less quantity of Al is required to achieve the maximum of combined diffusion coefficients. Maximum peaks for the combined coefficients are shifted to the higher temperature with increasing metal concentrations.

Keyword :

Plasma arc Diffusion coefficients Metal CO2

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GB/T 7714 Liu, Yang , Zhong, Linlin , Yang, Aijun et al. Combined Diffusion Coefficients in CO2 Thermal Plasmas Contaminated with Cu, Fe or Al [J]. | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2018 , 38 (5) : 1133-1149 .
MLA Liu, Yang et al. "Combined Diffusion Coefficients in CO2 Thermal Plasmas Contaminated with Cu, Fe or Al" . | PLASMA CHEMISTRY AND PLASMA PROCESSING 38 . 5 (2018) : 1133-1149 .
APA Liu, Yang , Zhong, Linlin , Yang, Aijun , Wang, Xiaohua , Rong, Mingzhe , Wu, Junhui . Combined Diffusion Coefficients in CO2 Thermal Plasmas Contaminated with Cu, Fe or Al . | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2018 , 38 (5) , 1133-1149 .
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Plasma Jets With Needle-Ring Electrodes: The Insulated Sealing of the Needle and its Effect on the Plasma Characteristics EI SCIE Scopus
期刊论文 | 2018 , 46 (8) , 2942-2948 | IEEE TRANSACTIONS ON PLASMA SCIENCE
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Abstract :

In this paper, in order to obtain an atmospheric-pressure plasma jet with high activity and safe performance, the plasma jets generated with three distinct needle-ring electrodes, i.e., completely covered needle with insulating dielectric, partially covered needle (PCN) with insulating dielectric, and noncovered needle with any insulating dielectric, are studied and compared. Corresponding characteristics of three types of plasma jets are diagnosed and compared under the same excitation conditions. The results show that the PCN electrode is the hest optimized one of three electrodes and presents the best cost performance among them in terms of discharge morphology, safety performance, propagation speed, and concentration of reactive species. It is mainly attributed to the addition of the partial insulating dielectric between the needle electrode and the ring electrode, which would not only effectively limit current rapid growth and prevent the rapid transformation of discharge mode, but also promote the charge overflow and strengthen the chemical activity of the plasma jet.

Keyword :

safer performance spatial distribution Atmospheric-pressure plasma jet (APPJ) needle-ring electrodes reactive species

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GB/T 7714 Liu, Dingxin , Zhang, Zhiquan , Liu, Zhijie et al. Plasma Jets With Needle-Ring Electrodes: The Insulated Sealing of the Needle and its Effect on the Plasma Characteristics [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2018 , 46 (8) : 2942-2948 .
MLA Liu, Dingxin et al. "Plasma Jets With Needle-Ring Electrodes: The Insulated Sealing of the Needle and its Effect on the Plasma Characteristics" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 46 . 8 (2018) : 2942-2948 .
APA Liu, Dingxin , Zhang, Zhiquan , Liu, Zhijie , Wang, Bingchuan , Li, Qiaosong , Wang, Xiaohua et al. Plasma Jets With Needle-Ring Electrodes: The Insulated Sealing of the Needle and its Effect on the Plasma Characteristics . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2018 , 46 (8) , 2942-2948 .
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Comparison of dielectric breakdown properties for different carbon-fluoride insulating gases as SF6 alternatives EI SCIE Scopus
期刊论文 | 2018 , 8 (8) | AIP ADVANCES
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As a widely used insulating medium, sulfur hexafluoride (SF6) is a greenhouse gas with very high global warming potential (GWP). Some carbon-fluoride gases have potential to replace SF6 in insulating applications. In order to reveal their different dielectric performance, this paper is devoted to a comparative study of dielectric breakdown properties for SF6 and four carbon-fluoride insulating gases i.e. CF3I, C2F6, C3F8, and c-C4F8 mixed with CO2, N-2, and CF4 based on the numerical solution of Boltzmann equation. The electron energy distribution function (EEDF), reduced ionization coefficients alpha/N, reduced electron attachment coefficients eta/N, and reduced critical electric field strength (E/N)(cr) are compared for various gas mixtures. Generally c-C4F8 presents the largest dielectric strength among the four carbon-fluoride insulating gases whichever buffer gas is mixed, while C2F6 presents the lowest dielectric strength. In terms of (E/N)(cr) and GWP, CF3I is a good eco-friendly insulating medium. However, with the addition of buffer gases, the (E/N)(cr) of CF3I mixtures declines more quickly than other mixtures. It is also found that the mixing of CF4 makes insulating mixtures depend more linearly on the proportions of buffer gas than CO2 and N-2. (C) 2018 Author(s).

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GB/T 7714 Zhong, Linlin , Wang, Jiayu , Wang, Xiaohua et al. Comparison of dielectric breakdown properties for different carbon-fluoride insulating gases as SF6 alternatives [J]. | AIP ADVANCES , 2018 , 8 (8) .
MLA Zhong, Linlin et al. "Comparison of dielectric breakdown properties for different carbon-fluoride insulating gases as SF6 alternatives" . | AIP ADVANCES 8 . 8 (2018) .
APA Zhong, Linlin , Wang, Jiayu , Wang, Xiaohua , Rong, Mingzhe . Comparison of dielectric breakdown properties for different carbon-fluoride insulating gases as SF6 alternatives . | AIP ADVANCES , 2018 , 8 (8) .
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Theoretical study of the decomposition mechanism of SF6/Cu gas mixtures EI SCIE Scopus
期刊论文 | 2018 , 51 (42) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
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Abstract :

The compositions of SF6 are plasma are contaminated by Cu vapor through electrode erosion and thus affect the performance of the high-voltage SF6 circuit breaker. But the essential data for chemical kinetic models to study the non-equilibrium compositions of SF6/Cu mixtures, namely the decomposition mechanism of SF6/Cu mixtures, is still not clear. Besides, SF6 decomposition products can be used to diagnose insulation faults of GIS and to evaluate the electric life of the SF6 circuit breaker, but the uncertainty of the decomposition mechanism of SF6/Cu mixtures hinders the application of the analysis method of SF6 decomposition products. Therefore, this work is devoted to investigating the decomposition mechanism of SF6/Cu mixtures by means of density functional theory in conjunction with 6-311G(d,p) basis set (for S and F atoms) and Lan12DZ basis set (for the Cu atom). The optimized molecular structures, harmonic vibrational frequencies and energetic information of reactants, intermediate products (IM), transition states (TS) and products are thoroughly studied. And the complete decomposition pathways of SF6/Cu mixtures involving 15 reactions are derived. Detailed potential energy surfaces of SF6 + Cu decomposition reactions are also depicted as a result. Among all the decomposition pathways, the favorable decomposition reactions of SF6 + Cu mixtures are found: reaction R1 contributes more than reaction R2 in the decomposition of SF6 + Cu mixtures due to its lower energy released; reaction R3 is dominant in the decomposition of SF5 + Cu other than multi-step reactions; the chemical processes of SF4 + Cu -> IMx -> TSy (where x stands for 9, 10 and 13, and y denotes 7, 8 and 9) may play the same role in SF4 + Cu decomposition, but the reaction rate of R6 is higher than other reactions; reaction R9 and R11 are relative favorable among SF3 + Cu decomposition reactions; reaction R13 is dominant in the decomposition of SF2 + Cu because of its high potential well. This work hopes to outline a theoretical basis to investigate the non-equilibrium compositions of SF6/Cu arc plasma and the SF6 decomposition products analysis method.

Keyword :

decomposition mechanism decomposition pathway SF6/Cu mixtures density functional theory

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GB/T 7714 Fu, Yuwei , Wang, Xiaohua , Yang, Aijun et al. Theoretical study of the decomposition mechanism of SF6/Cu gas mixtures [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (42) .
MLA Fu, Yuwei et al. "Theoretical study of the decomposition mechanism of SF6/Cu gas mixtures" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 51 . 42 (2018) .
APA Fu, Yuwei , Wang, Xiaohua , Yang, Aijun , Rong, Mingzhe , Duan, Jiandong . Theoretical study of the decomposition mechanism of SF6/Cu gas mixtures . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (42) .
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Highly selective detection of sulfur hexafluoride decomposition components H2S and SOF2 employing sensors based on tin oxide modified reduced graphene oxide EI SCIE Scopus
期刊论文 | 2018 , 135 , 95-103 | CARBON
WoS CC Cited Count: 9 SCOPUS Cited Count: 11
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In this paper, a high-performance sensor based on tin oxide modified reduced graphene oxide (SnO2-rGO) has been prepared via a one-step hydrothermal process for the detection of sulfur hexafluoride (SF6) decomposition components H2S and SOF2. The morphology and nanostructure of the product were characterized by X-ray diffraction (XRD), Raman spectroscopy (RS), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The gas sensing properties of SnO2-rGO nanocomposite were investigated by exposing to various target gases. The experimental results revealed that SnO2-rGO sensor exhibited better responses (34.31% and -3.13%) than those (5.97% and -1.45%) of pristine rGO sensor at the optimal temperature of 125 degrees C in the presentence 100 ppm H2S and 10 ppm SOF2, respectively. Meanwhile, SnO2-rGO sensor emerged as one of the promising candidate materials to select these two gases by yielding opposite response to H2S and SOF2. In addition, uniformity, repeatability, long-term stability of SnO2-rGO sensors were investigated to demonstrate the practicability, and the possible mechanism of SnO2-rGO nanocomposite for sensing H2S and SOF2 was discussed. (C) 2018 Elsevier Ltd. All rights reserved.

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GB/T 7714 Chu, Jifeng , Wang, Xiaohua , Wang, Dawei et al. Highly selective detection of sulfur hexafluoride decomposition components H2S and SOF2 employing sensors based on tin oxide modified reduced graphene oxide [J]. | CARBON , 2018 , 135 : 95-103 .
MLA Chu, Jifeng et al. "Highly selective detection of sulfur hexafluoride decomposition components H2S and SOF2 employing sensors based on tin oxide modified reduced graphene oxide" . | CARBON 135 (2018) : 95-103 .
APA Chu, Jifeng , Wang, Xiaohua , Wang, Dawei , Yang, Aijun , Lv, Pinlei , Wu, Yi et al. Highly selective detection of sulfur hexafluoride decomposition components H2S and SOF2 employing sensors based on tin oxide modified reduced graphene oxide . | CARBON , 2018 , 135 , 95-103 .
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