Experimental Drain I-V Characteristics of Power MOS Transistors and the Nature of Reverse Leakage Current of Oxide Passivated PN Junctions

Obreja, V.V.N.; Podaru, C.; Manea, E.; Coraci, A.; Codreanu, C.

doi:10.1109/smicnd.2006.284004

Cited by 3 publications

(1 citation statement)

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“…from coconuts or wood (''Activated Carbon'' (AC)) are widely used in commercial devices. 3 Many other nanostructured carbon materials have also been demonstrated as promising for the preparation of supercapacitor electrodes, for example carbide derived porous carbons, 4 carbon nanotubes (CNT), 5 and, more recently, graphene-related materials (GRMs). 6 Graphene is widely considered as a very promising material for preparation of porous electrodes thanks to its excellent electrical conductivity and high theoretical surface area (2650 m 2 g À1 ).…”

Section: Introductionmentioning

confidence: 99%

Activated graphene as a material for supercapacitor electrodes: effects of surface area, pore size distribution and hydrophilicity

Iakunkov

Skrypnychuk

Nordenström

et al. 2019

Phys. Chem. Chem. Phys.

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Activated reduced graphene oxide (a-rGO) is a material with a rigid 3D porous structure and high specific surface area (SSA). Using variation of activation parameters and post-synthesis mechanical treatment we prepared two sets of materials with a broad range of BET (N 2 ) SSA B1000-3000 m 2 g À1 , and significant differences in pore size distribution and oxygen content. The performance of activated graphene as an electrode in a supercapacitor with KOH electrolyte was correlated with the structural parameters of the materials and water sorption properties. a-rGO is a hydrophobic material as evidenced by the negligibly small BET (H 2 O) SSA determined using analysis of water vapor sorption isotherms. However, the total pore volume determined using water vapor sorption and sorption of liquid water is almost the same as the one found by analysis of nitrogen sorption isotherms. Ball milling is found to provide an improved bulk density of activated graphene and collapse of all pores except the smallest ones (o2 nm). A decrease in the activation temperature from 850 1C to 550 1C is found to result in materials with a narrow micropore size distribution and increased oxygen content. Elimination of mesopores using ball milling or a lower activation temperature provided materials with better specific capacitance despite a significant decrease (by B30%) of the BET (N 2 ) SSA. The best gravimetric and volumetric capacitances in KOH electrolyte were achieved not for samples with the highest value of the BET (N 2 ) SSA but for materials with 80-90% of the total pore volume in micropores and an increased BET (H 2 O) SSA. Comparing the performance of electrodes prepared using rGO and a-rGO shows that a more hydrophilic surface is favorable for charge storage in supercapacitors with KOH electrolyte. Fig. 14 Electrochemical analyses of rGO and a-rGO materials activated at 550 1C, 600 1C and 850 1C: (a) CV curves recorded at 50 mV s À1 . (b) Charge/discharge curves recorded at a 1 A g À1 current density. PCCPPaper

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Section: Introductionmentioning

confidence: 99%