Browsing by Author "Taymaz, Bircan Haspulat"

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Citation - WoS: 3
Citation - Scopus: 3
Enhanced Performance of Mxene-Based Supercapacitor Via New Activated Carbon-Nafion Composite Cathode
(Pergamon-elsevier Science Ltd, 2025) Akilli, Aleyna; Taymaz, Bircan Haspulat; Eskizeybek, Volkan; Kamis, Handan
Asymmetric supercapacitors leverage differences in the work functions of electrode materials to achieve an extended operating potential window and enhanced energy storage capacity. In this study, an asymmetric supercapacitor was developed using Ti3C2Tx MXene as the working electrode and a composite of activated carbon-nafion (AC-N) and activated carbon-polyvinylidene fluoride (AC-P) as the counter electrode. The work functions of MXene and AC-N were measured as 7.06 and 9.6 eV, respectively, enabling a potential window expansion to 2 V with the AC-N counter electrode. Electrochemical evaluations in H2SO4, MgSO4, and KOH electrolytes revealed specific capacitance values of 555, 367.5, and 425 F g-1 in, respectively. Additionally, corresponding power densities reached 1023, 999.86, and 1980.25 W kg- 1 , while energy densities were determined to be 81.2, 40.55, and 26 Wh kg- 1 . These findings highlight a straightforward strategy to enhance energy storage performance by leveraging the distinctive properties of MXene.
Citation - WoS: 2
Citation - Scopus: 2
Lightweight and Sustainable Recycled Cellulose Based Hybrid Aerogels With Enhanced Electromagnetic Interference Shielding
(Springer, 2025) Taymaz, Bircan Haspulat; Eskizeybek, Volkan
Developing lightweight, sustainable, high porosity, and high-performance electromagnetic interference (EMI) shielding apparatus is essential to diminish electromagnetic contamination for protecting human health and electronic devices. Herein, 1D carbon nanotubes (CNTs) and 2D graphene nanoplatelets (GNPs) functionalized recycled cellulose aerogel (RCA) were fabricated via a facile method by freeze, solvent exchange, and ambient drying. The effect of nanofiller type and quantity on the structural, morphological, electrical, thermal and EMI shielding performance of the RC-based aerogel were investigated. The as-prepared hybrid aerogel displays the maximum 40.2 dB electromagnetic interference shielding efficiency (SE) at 8.92 dB GHz with absorption dominant characteristic. CNTs:GNPs nanofillers in recycled cellulose matrix provoked conductivity mismatching and increased interfacial polarization loss. At a density of 0.087 gcm-3, CNTs:GNPs; 7:7%wt. doped RCA exhibits a highly specific SE (SSE) value of 461.95 dBcm3g-1 and an absolute SE (SSE/t) value of 2309.29 dBcm2g-1. These results show that the CNTs:GNPs; 7:7%wt. doped RCA can meet practical applications' lightweight and high-efficiency EMI shielding requirements.
Citation - WoS: 1
Citation - Scopus: 1
Optimized Size Sorting of Mxene Particles Via Centrifugal Sedimentation: a Practical Approach Using an Empirical Model and Image Processing Technique
(Taylor & Francis inc, 2025) Onat, Buket; Taymaz, Bircan Haspulat; Eskizeybek, Volkan; Kamis, Handan
Controlling the physical, mechanical, and electrochemical properties of MXene-based materials is crucial for their effectiveness in macroscale applications and is closely tied to the particle size distribution of MXene. This study aimed to accomplish dimensional control and sorting of MXene colloids with different particle sizes using centrifugal sedimentation based on an empirical model. Centrifuge time and rotating speed were identified as key parameters and optimized using a mathematical formula generated from the model, considering particle forces in the solution. A novel image processing technique aimed at ease of use was devised to evaluate the separation process, assuring the audience of its usability. The separation efficiencies were measured individually at rotating speeds ranging from 2900 to 6000 rpm. The optimal experimental settings differed between the supernatant and sediment fractions. The maximum separation efficiency was reached at 86% for the supernatant at 3500 rpm for 49 min and 43% for the sediment at 4200 rpm for 34 min, suggesting that supernatant-based separation is more efficient than sediment-based techniques. This study offers a valuable guideline for separating the sizes of 2D materials. Image processing offers scalable particle size measurement, which improves material property control for a variety of applications.