Yazar "Karabiber, Abdulkerim" seçeneğine göre listele
Listeleniyor 1 - 12 / 12
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Boron minerals with different crystal structures as performance manipulators in triboelectric nanogenerators(John Wiley and Sons Inc, 2024) Topçu, Mehmet Ali; Karabiber, Abdulkerim; Koç, Feyyaz; Sarılmaz, Adem; Özel, FarukTriboelectric nanogenerators (TENGs) are energy generation devices that naturally convert mechanical movements into electrical energy through both triboelectric and electrostatic effects. The electricity generation capacity of silicone/boron minerals-based composite and glass fiber-based vertical contact separation mode TENGs enhances by adjusting the triboelectrification characteristics by embedding natural boron minerals (NBO) such as borax, colemanite, and ulexite additives. Considering the generated voltages, the NBO-doped silicone and glass fiber-based TENGs offer the maximum performance with 2.5 wt% borax, 7.5 wt% colemanite, and 5 wt% ulexite. The highest power density of corresponding NBO-doped silicone glass fiber TENGs finds as 25.4, 26.03, and 32.03 W m−2, respectively. This work demonstrates that using boron significantly improves the TENG's power and charging capacities fabricated with silicone and glass fiber. Thus, the clean and safe generation of energy will contribute to the reduction of fossil fuel consumption and help protect the environment.Öğe Dielectric size optimization for high power density in large-scale triboelectric nanogenerators(Tsinghua Univ Press, 2024) Karabiber, Abdulkerim; Dirik, Omer; Koc, Feyyaz; Ozel, FarukTriboelectric nanogenerators (TENGs) have emerged as a promising technology to harvest electrical energy from natural motions such as human movement, wind, and water flow. Although TENGs show significant potential in small-scale applications, developing large-scale TENGs capable of generating high power remains a significant challenge. Several factors that can affect the performance of large-scale TENGs are being investigated to overcome this challenge, including the size and configuration of dielectric materials. This study optimizes dielectrics regarding surface area, thickness, and multicell configuration to improve harvested electrical power density in large-scale TENGs. In the studies, glass fiber was used as the positive dielectric, and multipurpose white silicone was used as the negative dielectric because of their high tribo-potential, durability, and easy accessibility. In the size optimization phase, dielectric thicknesses and surface areas that provide the maximum power density were determined. Subsequently, horizontal and vertical multicell configurations were examined to efficiently integrate size-optimized dielectrics. The results reveal that large-scale TENGs with vertical multicell configurations can achieve high and usable energy density for electronics. The findings provide valuable insight into the development of large-scale TENGs with advanced power generation capabilities.Öğe Enhanced performance of triboelectric nanogenerator based on polyamide-silver antimony sulfide nanofibers for energy harvesting(Elsevier Ltd., 2021) Yar, Adem Yazdan; Kınas, Zeynep; Karabiber, Abdulkerim; Özen, Abdurrahman; Okbaz, Abdulkerim; Özel, FarukTriboelectric nanogenerators (TENGs) are new renewable energy harvesting devices that convert small-scale mechanical movements into electrical energy. Nowadays, the dielectric materials with high tribopotential are being investigated significantly to improve the energy conversion efficiency of TENGs. Nanofibers are widely used as dielectric materials in TENGs due to their high surface area and flexibility. In this study, polyacrylonitrile nanofibers and AgSbS2 doped Nylon 6.6 nanofibers were tested as dielectric layers in spring assisted TENGs. Decorating Nylon 6.6 with AgSbS2 both enhanced the output voltage and markedly advanced the power density of the TENGs, and thus improved triboelectric performance of the TENGs. According to the results, tribopotential of Nylon 6.6 was enhanced as AgSbS2 additive amount increased. Compared to PAN/Nylon 6.6 nanofibers based TENG, PAN/10 wt% AgSbS2@Nylon 6.6 nanofibers based TENG exhibited 2.95 and 1.68 fold enhancement in power density and output voltage, respectively. The peak power density of PAN/10 wt% AgSbS2@Nylon 6.6 nanofibers based TENG reached 6.81 W/m2 under a load resistance of 10 MΩ. From the perspective of the choices of materials and design, the results demonstrate that grafting AgSbS2 nanocrystal materials into Nylon 6.6 nanofibers is an effective way to make better the triboelectric performance of nanofibers mat based TENG. Therefore, the study not only shows a high triboelectric performance of nanofibers based TENG, but also shed on light new glance into the material selection, fabrication, and design for contact-separation mode TENGs.Öğe Flexible nanofiber based triboelectric nanogenerators with high power conversion(Elsevier, 2020) Yar, Adem; Karabiber, Abdulkerim; Özen, Abdurrahman; Özel, Faruk; Coşkun, ŞahinTriboelectric nanogenerators (TENGs) convert small mechanical movements into electrical energy based on electrostatic principles. Nowadays, the energy efficiency of TENGs is low and needs to be increased for use in self-powered electronic devices. The energy efficiency can be enhanced by developing new dielectric materials with higher electrical charge capacity. In this study, PAN/ZnO and PAN/B(OH)(3) flexible nanofibers as a triboelectric contact layer are fabricated for the first time to improve the power production performance of polyacrylonitrile (PAN). In the experiments, PAN/ZnO and PAN/B(OH)(3) were used as tribopositive dielectric and polyvinyl butyral (PVB) was used as a tribonegative dielectric of TENGs. According to the results, the power density of TENGs changes with dielectric material sizes and load conditions. The peak power density of 3 x 3 cm PAN/B(OH)(3) reaches 6.67 Wm(-2) when the load is 33 MU. Since, the solution-based synthesized ZnO has limited crystallinity, no favorable effect was observed on the power production performance of PAN. The results demonstrated that facile and low-cost fabrication method in accordance with the new TENGs design shed light on a new route for the enhancement of high-performance TENGs. In addition, the fabricated PAN-based nanofibrous structures can be beneficial for the improvement of advanced triboelectric technology.Öğe High-performance triboelectric nanogenerator based on carbon nanomaterials functionalized polyacrylonitrile nanofibers(Elsevier Ltd., 2022) Kınas, Zeynep; Karabiber, Abdulkerim; Yar, Adem Yazdan; Özen, Abdurrahman; Ersöz, Mustafa; Özel, Faruk; Okbaz, AbdulkerimTriboelectric nanogenerators (TENGs) are one of the most promising energy sources for self-powered electronic devices in the near future. Improving the dielectrics with high tribo-potential is a primary requirement to increase the output performance of TENGs. In this study, spring supported TENGs consisting of polyvinylpyrrolidone/ethyl-cellulose (PVP/EC) nanofibers and various carbon-doped polyacrylonitrile (PAN) nanofibers as positive and negative dielectric layers, respectively, were fabricated. According to the experimental results, reduced graphene oxide (rGO) and carbon nanotube (CNT) which were grafted to PAN matrix, both increased surface charge density and enhanced the output voltage of the TENGs. On the other hand, carbon black (CB) reduced the tribo-potential of PAN as a negative dielectric layer. As the best result, a 40 × 40 mm2 TENG constructed of PVP/EC and 3 wt% CNT doped PAN nanofibers demonstrates high triboelectric characteristics with a charge capacity of 260 nC (under 0.022 μF capacitive load), a maximum peak output voltage of 960 V (under a 70 MΩ load resistance), and a maximum peak power density of 14.6 W/m2 (under a 14.6 MΩ load resistance). In other words, the addition of 3 wt% CNT to PAN increased the charge amount by 136%, and the maximum peak power density by 125%. This work presents an effective way to take advantage of the coupling effect of carbon additive and nanofiber structure to significantly enhance the output performance of TENGs.Öğe High-performance triboelectric nanogenerator with optimized Al or Ti-embedded silicone tribomaterial(Elsevier Ltd., 2021) Okbaz, Abdulkerim; Karabiber, Abdulkerim; Yar, Adem Yazdan; Kınas, Zeynep; Sarılmaz, Adem; Özel, FarukIn this study, we have enhanced the electricity generation capacity of a silicone and glass fiber-based vertical contact separation mode triboelectric nanogenerator (TENG) by optimizing the thickness of the silicone material and by tuning the triboelectrification characteristics embedding Al or Ti conductive materials. Considering electrical outputs, the optimum thickness of the silicone triboelectric material layer decorated with 2.5 wt% Al or 2.5 wt% Ti is found to be 0.85 mm. The silicone and glass fiber-based TENG delivers the highest performance with 2.5 wt% Al or 5 wt% Ti embedding. The peak power density of 2.5 wt% Al or 5 wt% Ti-embedded silicone glass fiber TENGs are 22.6 W/m2 and 21.3 W/m2, respectively. Embedding 2.5 wt% Al or 5 wt% Ti enhances output power density by 2.19 folds and 2.06 folds, respectively compared to the pure silicone tribonegative layer. We have demonstrated that using conductive fillers significantly increases the TENGs' powers and charging capacitiesÖğe High-power triboelectric nanogenerator based on enriched polyvinylpyrrolidone nanofibers for energy harvesting(John Wiley and Sons Inc, 2022) Özen, Abdurrahman; Karabiber, Abdulkerim; Kınas, Zeynep; Özel, FarukTriboelectric nanogenerators (TENGs) are a new, low-cost, and easy-to-manufacture technology for converting mechanical energy into electrical energy. TENGs have great potential to be used in electronic devices, but their energy efficiency is low for use in commercial products today. The most important way to increase the energy efficiency of TENGs is to develop tribo-positive and tribo-negative materials with a large surface area and high dielectric coefficients. Herein, cetrimonium bromide (CTAB) and dodecyl trimethyl ammonium bromide (DTAB) organic molecule-doped polyvinylpyrrolidone (PVP) nanofibers are tested as a positive dielectric layer against the negative dielectric layer made of polyacrylonitrile (PAN) nanofiber. The results reveal that CTAB and DTAB additives of 1, 2.5, and 5 wt% increase the tribo-potential of PVP, while the additives of 7.5 and 10 wt% decrease the tribo-potential of PVP. According to the electrical measurements, the maximum open-circuit voltages are obtained as 500 and 515 V, whereas the maximum powers were obtained as 25.02 and 26.52 mW for the TENGs made of 5 wt% CTAB- and DTAB-doped PVP nanofibers, respectively. The proposed cationic surfactant-doped nanofibers can be employed as a positive dielectric layer to increase the energy efficiency and power density of TENGs.Öğe Nano-ceria based TENGs: Effect of dopant structure on energy harvesting performance(Elsevier B.V., 2022) Arkan, Emre; Karabiber, Abdulkerim; Topçu, Mehmet Ali; Kinas, Zeynep; Sarılmaz, Adem; Özel, FarukEngineering of materials with high dielectric constant is of great importance for highly efficient TENGs. The feasible way to reach this is to compose it with proper chemicals having a high dielectric constant such as nanopowders. In this work, the doping effect of the two different architectures of the same compound on triboelectric production has been studied. Nanopowder Cerium Oxide (CeO2) and its fiber arrangement have been selected and embedded into the silicon to enhance the tribonegative charge potential and their contributions to TENGs’ parameters relying on the varying doping ratios have been investigated. A large spectrum of analyses, such as XRD, SEM, TEM, HR-TEM, EDX, elemental mapping, Raman spectrum with mapping, optical microscope, and profilometer, has been used to elucidate the relationship between structural properties of produced dielectric layers and device performance. Both CeO2 nanoparticles and nanofibers, at 5wt% doping rates, have provided in turn ∼80% and ∼63% times higher power than that of undoped form since their doping has delivered a formation of more effective surface area. The findings of this research play an important role in addressing the issue of how TENGs’ performance can be regulated by playing with materials’ architecture instead of its chemical composition.Öğe One Material-Opposite Triboelectrification: Molecular Engineering Regulated Triboelectrification on Silica Surface to Enhance TENG Efficiency(Mdpi, 2023) Arkan, Mesude Zeliha; Kinas, Zeynep; Yalcin, Eyup; Arkan, Emre; Ozel, Faruk; Karabiber, AbdulkerimMolecular engineering is a unique methodology to take advantage of the electrochemical characteristics of materials that are used in energy-harvesting devices. Particularly in triboelectric nanogenerator (TENG) studies, molecular grafting on dielectric metal oxide surfaces can be regarded as a feasible way to alter the surface charge density that directly affects the charge potential of triboelectric layers. Herein, we develop a feasible methodology to synthesize organic-inorganic hybrid structures with tunable triboelectric features. Different types of self-assembled monolayers (SAMs) with electron-donating and withdrawing groups have been used to modify metal oxide (MO) surfaces and to modify their charge density on the surface. All the synthetic routes for hybrid material production have been clearly shown and the formation of covalent bonds on the MO's surface has been confirmed by XPS. The obtained hybrid structures were applied as dopants to distinct polymer matrices with various ratios and fiberization processes were carried out to the prepare opposite triboelectric layers. The formation of the fibers was analyzed by SEM, while their surface morphology and physicochemical features have been measured by AFM and a drop shape analyzer. The triboelectric charge potential of each layer after doping and their contribution to the TENG device's parameters have been investigated. For each triboelectric layer, the best-performing tribopositive and tribonegative material combination was separately determined and then these opposite layers were used to fabricate TENG with the highest efficiency. A comparison of the device parameters with the reference indicated that the best tribopositive material gave rise to a 40% increase in the output voltage and produced 231 V, whereas the best tribonegative one led to a 33.3% rise in voltage and generated 220 V. In addition, the best device collected similar to 83% more charge than the reference device and came up with 250 V that corresponds to 51.5% performance enhancement. This approach paved the way by addressing the issue of how molecular engineering can be used to manipulate the triboelectric features of the same materials.Öğe Performance-enhanced of triboelectric nanogenerator based on functionalized silicone with pumice for energy harvesting(Elsevier Ltd, 2023) Topçu, Mehmet Ali; Karabiber, Abdulkerim; Sarılmaz, AdemTriboelectric nanogenerators (TENGs) are one of the technologies of obtaining clean energy, have become one of the interesting methods in recent years. Although TENGs have advantages such as low cost, easy fabrication, lightweight, and wide range of use, their low output values limit their use in commercial applications. In this study, we investigated the output performance of a silicone sealant and glass fiber based TENG by doping pumice to a silicone sealant matrix. According to the experimental studies, the output performance of TENG improved with increasing pumice addition and the highest output voltage was obtained for the TENG fabricated with 2.5 wt% pumice doping silicone. The highest power density was obtained with 2.5 wt% pumice doped silicone as 23.65 mW. Also, it was observed that the TENG output power was increased by 36.9% with pumice doping in the silicone sealant matrix. It was demonstrated that pumice doping has a great effect on surface roughness, dielectric constant, and dielectric loss which affect the TENG performance. As a result of this study, it was concluded that the TENG output performance could be enhanced and fabrication cost could be reduced with pumice as natural doping material.Öğe Transition Metal Dichalcogenides as Effective Dopants in Nanofiber-Based Triboelectric Nanogenerators(Wiley, 2024) Karabiber, Abdulkerim; Dirik, Ömer; Okbaz, Abdulkerim; Yar, Adem; Özen, Abdurrahman; Özel, FarukTriboelectric nanogenerators (TENGs) are advanced energy harvesters that convert mechanical energy in diverse environments into electrical energy via static electrification and electrostatic induction. However, their performance needs to be improved to expand their area of use and become more practical. In this study, we introduced molybdenum disulfide (MoS2) and tungsten disulfide (WS2) as separate additives into polyacrylonitrile (PAN) to produce composite nanofibers via electrospinning, aiming to increase the electrical output of the TENGs. This method increased contact area by narrowing the nanofiber diameters, which is a key factor in enhancing the triboelectric effect. The incorporation of MoS2 or WS2, characterized by high specific surface area, interface polarization, quantum confinement effects, and strong electron acceptance and trapping capabilities, led to a significant increase in the dielectric constant and overall electrical performance of the TENGs. Experimental evaluations, connecting the TENGs to circuits with various resistive loads, determined optimal performance at a load resistance of 4.7 M Omega. In particular, the 5 wt% WS2@PAN & polyvinylbutral (PVB) and 5 wt% MoS2@PAN & PVB TENGs exhibited a remarkable peak power output of 40.5 mW, corresponding to a power density of 25.3 W/m2 and provided open circuit voltage of 1,026 V. The integration of 5 wt% MoS2 or 5 wt% WS2 led to more than a twofold increase in electrical power density compared to pristine PAN. These outcomes demonstrate the significant impact of transition metal dichalcogenides in enhancing the energy conversion efficiency of contact-separation mode TENGs, thereby contributing to the advancement of energy harvesting technology.Öğe Triboelectric Nanogenerator with Nanofiber Dielectric Layer Enriched through Novel Zinc Phthalocyanine Carrying Four O-Carboranyl Units(Wiley-V C H Verlag Gmbh, 2023) Ozen, Abdurrahman; Karabiber, Abdulkerim; Sener, Sevil; Ipek, Osman; Ozel, FarukTriboelectric nanogenerator (TENG) technology is one of the new, low-cost, and simple methods used to convert mechanical energy into electrical energy. Despite having so many advantages, the energy efficiency of this technology is extremely low. Therefore, their current performance needs to be improved so that they can be used more in daily life. Nanofibers (NFs) are one of the most important material groups that can be used for this technology due to their large surface area-volume ratio, easy production, low cost, and simplicity. Herein, Nylon 6.6 and polyacrylonitrile are used as tribopositive and tribonegative dielectric layers, respectively. To increase the output performances of the TENG system, different weight ratios (1, 2, 3 wt%) of phthalocyanine containing zinc-based carborane units (ZnPc) are added into the Nylon 6.6 NFs. In accordance with the obtained results, the maximum open circuit voltage and power are measured as 228 V and 7.76 mW, respectively. These results correspond for the TENG system with 1% by weight ZnPc doped into the NFs. These results show that high-efficiency TENG systems can be obtained with nanofiber-based dielectric layers and can be used effectively in self-powered systems.
