A novel green and one-step electrochemical method for production of sulfur-doped graphene powders and their performance as an anode in Li-ion battery

Graphene-based negative electrodes in lithium-ion batteries have recently been the focus of interest. In this study, sulfur (S)–doped graphene powders in different functionality have been prepared in one step by using Yucel’s method for the first time in the literature and they have been used as anode materials of Li-ion batteries. By changing the scanned potential during the preparation of S-doped graphene powders, the graphenic surface is covalently doped by –C-S-C- and –C-SOx-C- (x:2, 3) groups at different amount. When the potential has been scanned in wider potential range (− 1.0 and 2.5 V), 48 sp2-hybridized carbon rings have been determined on the powders by using Raman analysis. It is the lowest as 16 for graphenic powder prepared at narrower potential range (1.5 and 2.5 V) and chronoamperometric method. S-doped graphene powders have been investigated by microscopic methods. Electrochemical properties of the prepared S-doped graphene powders and their potential use in Li-ion batteries have been assessed. At a 50-mA/g current density, the 915-mAh/g specific capacity has been determined as the highest discharge capacity in the powder which was prepared by the chronoamperometric method. Specific capacities of 710 mAh/g, 594 mAh/g, and 642 mAh/g have been observed in the powders prepared between − 1.0–(+ 2.5 V), 0.6–(+ 2.5 V), and 1.5–(+ 2.5 V) samples, respectively. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature

potential application of them: Anode materials of Li-ion batteries

Nowadays, doped graphenes are attracting much interest in the field of Li-ion batteries since it shows higher specific capacity than widely used graphite. However, synthesis methods of doped graphenes have secondary processes that requires much energy. In this study, in situ synthesis of N-doped graphene powders by using of cyclic voltammetric method from starting a graphite rod in nitric acid solution has been discussed for the first time in the literature. The N-including functional groups such as nitro groups, pyrrolic N, and pyridinic N have been selectively prepared as changing scanned potential ranges in cyclic voltammetry. The electrochemical performance as anode material in Li-ion batteries has also been covered within this study. N-doped graphene powders have been characterized by electrochemical, spectroscopic, and microscopic methods. According to the X-ray photoelectron spectroscopy and Raman results, N-doped graphene powders have approximately 16 to 18 graphene rings in their main structure. The electrochemical analysis of graphene powders synthesized at different potential ranges showed that the highest capacity was obtained 438 mAh/g after 10 cycles by using current density of 50 mA/g at N-GP4. Furthermore, the sample having higher defect size shows better specific capacity. However, the more stable structure due to oxygen content and less defect size improves the rate capabilities, and thus, the results obtained at high current density indicated that the remaining capacity of N-GP1 was higher than the others.C1 [Gursu, Hurmus; Sahin, Yucel] Yildiz Tech Univ, Fac Art & Sci, Dept Chem, TR-34220 Istanbul, Turkey.[Guner, Yagmur] Pamukkale Univ, Dept Met & Mat Engn, TR-20160 Denizli, Turkey.[Dermenci, Kamil Burak; Buluc, Ahmet Furkan; Savaci, Umut; Turan, Servet] Eskisehir Tech Univ, Dept Mat Sci & Engn, TR-26555 Eskisehir, Turkey.[Gencten, Metin] Yildiz Tech Univ, Fac Chem & Met Engn, Dept Met & Mat Engn, TR-34210 Istanbul, Turkey

The impact ofCYP2D6*4andGSTP1Ile105Val polymorphisms on the susceptibility to develop BCR-ABL1 negative myeloproliferative neoplasms

Inter-individual variations in the genes encoding xenobiotic-metabolizing enzymes have been reported to alter susceptibility to various diseases involving hematological disorders. The purpose of this case-control study was to investigate the relationship betweenCYP2D6*4andGSTP1Ile105Val polymorphisms and the risk of developing BCR-ABL1 negative myeloproliferative neoplasms (MPN). PCR-RFLP was used for genotyping single nucleotide polymorphisms (SNP) inCYP2D6andGSTP1in 139 patients with MPN and 126 controls. There was a significantly increased risk for developing BCR-ABL1 negative MPN for the group bearing theCYP2D6*4variant allele (X-2: 4.487; OR 1.738; 95% CI 1.040-2.904; p = 0.034). The platelet count was higher inCYP2D6*4allele carriers (p = 0.047). There was no association between theGSTP1Ile105Val polymorphism and the risk of developing MPNs. MPN patients bearing theGSTP1Ile105Val variant allele had a higher prevalence of bleeding complications (X-2: 7.510; OR 4.635; 95% CI 1.466-14.650; p = 0.006). Our study provides new data that theCYP2D6*4polymorphism may be associated with an increased risk to develop MPNs while theGSTP1Ile105Val polymorphism does not show such an association. To our knowledge, the current study is the first to investigate the relationship betweenCYP2D6*4andGSTP1Ile105Val polymorphisms and the risk of developing MPNs in the Turkish population. Further studies with more patients and controls are needed to support our data

USE OF ELTROMBOPAG IN IMMUNE THROMBOCYTOPENIA IN TURKEY

24th Biennial International Congress on Thrombosis / EMLTD Congress -- MAY 04-07, 2016 -- Istanbul, TURKEYWOS: 000376766300044EMLT