DC and AC Performance of Graphite Films Supercapacitors Prepared by Contact Glow Discharge Electrolysis

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	DC and AC Performance of Graphite Films Supercapacitors Prepared by Contact Glow Discharge Electrolysis
	Elwakil, Ahmed S.; Allagui, Anis; Said, Zafar; Abdelkareem, Mohammad A.; Yang, Minghui; Alawadhi, Hussain
刊名	JOURNAL OF THE ELECTROCHEMICAL SOCIETY
	2017
卷号	64 期号:12 页码:A2539-A2546
ISSN号	0013-4651
英文摘要	In the present work, we fabricate and characterize carbon graphite films by high-voltage cathodic and anodic contact glow discharge electrolysis (CGDE) for supercapacitor applications. Transmission electron microscopy revealed that the carbon films obtained by anodic CGDE, in which a carbon graphite is used as the positive electrode, are in the form of two-dimensional, relatively large lateral size sheets without major fractures or structural distortions. Whereas with the cathodic configuration, tiny and elongated flakes of graphite attached to larger sheets are obtained. We observed negative Raman wavenumber shifts of the G peak and the appearance of the T peak at ca. 1100 cm(-1), which are attributed to thermal-induced strains and structural damages in the graphite crystal lattice, as well as to some C - C sp(3) bonds content. In addition to the aforementioned results and optical emission spectroscopy, it is proposed that both formation mechanisms by electrochemical exfoliation and material evaporation occur depending on the used polarization. All-solid-state symmetric supercapacitors using polyvinyl alcohol/H3PO4 as gel electrolyte were fabricated and tested under dc and ac frequencies. We found two different behaviors: at dc and close-to-dc, the material prepared with cathodic CGDE showed close-to-ideal behavior with higher capacitance at different charging/discharging rates, which makes it more suitable for energy storage applications, whereas at higher frequencies (>= 100 Hz), the material prepared with anodic CGDE performed better for ac filtering applications that has been verified using an inverting integrator circuit. (C) 2017 The Electrochemical Society. All rights reserved.
公开日期	2017-12-25
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/14054]
专题	2017专题
推荐引用方式 GB/T 7714	Elwakil, Ahmed S.,Allagui, Anis,Said, Zafar,et al. DC and AC Performance of Graphite Films Supercapacitors Prepared by Contact Glow Discharge Electrolysis[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2017,64(12):A2539-A2546.
APA	Elwakil, Ahmed S.,Allagui, Anis,Said, Zafar,Abdelkareem, Mohammad A.,Yang, Minghui,&Alawadhi, Hussain.(2017).DC and AC Performance of Graphite Films Supercapacitors Prepared by Contact Glow Discharge Electrolysis.JOURNAL OF THE ELECTROCHEMICAL SOCIETY,64(12),A2539-A2546.
MLA	Elwakil, Ahmed S.,et al."DC and AC Performance of Graphite Films Supercapacitors Prepared by Contact Glow Discharge Electrolysis".JOURNAL OF THE ELECTROCHEMICAL SOCIETY 64.12(2017):A2539-A2546.