Browsing by Author "Durukan, Mete Batuhan"

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    Multichromic vanadium pentoxide thin films through ultrasonic spray deposition
    (Electrochemical Society, Inc., 2021-10-27) Tutel, Yusuf; Durukan, Mete Batuhan; Koç, Şeyma; Koylan, Serkan; Çakmak, Hüseyin; Koçak, Yusuf; Hekmat, Farzaneh; Özensoy, Emrah; Özbay, Ekmel; Arslan Udum, Yasemin; Toppare, Levent; Unalan, Husnu Emrah
    Vanadium pentoxide (V2O5) is a highly promising material for optoelectronic applications due to its wide optical band gap, significant thermal/chemical stability, and intriguing multichromic properties. Nonetheless, the production of uniform and crack-free V2O5 thin films over large areas via conventional deposition methods remain to be a challenge. In this work, we demonstrate deposition of microscopically uniform, large area (15 cm × 15 cm), nanocrystalline and multichromic V2O5 thin films onto fluorine-doped tin oxide (FTO) coated glass substrates via ultrasonic spray deposition (USD) method. Thin-film formation behavior, microstructural and optoelectronic properties of the deposited films were investigated as a function of post-deposition annealing temperature. Electrochromic performance of the fabricated films up to an area of 15 cm × 15 cm was monitored using cyclic voltammetry (CV), where 3 different coloration states of V2O5 were observed under different applied potentials. Electrochromic devices fabricated with the deposited V2O5 thin films were found to be stable up to 1000 cycles. Results presented herein provide a new roadmap for the large area deposition of V2O5 through USD method, which can be readily extended to a vast number of other functional metal oxide systems.
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    Overcoming instability challenges of binder-free, self-standing 1T-TiS2 electrodes in aqueous symmetric supercapacitors through dopamine functionalization
    (ELSEVIER, 2025-03) Koçak, Yusuf; Ülgüt, Burak; Özensoy, Emrah; Uçar, Ali Deniz; Bağlıcakoğlu, Sümeyye Kandur; Durukan, Mete Batuhan; Cugunlar, Murathan; Öz, Sena; Ünalan, Hüsnü Emrah
    Two-dimensional materials draw considerable interest for energy storage. Semimetallic phases of transition metal dichalcogenides (TMDs), notably titanium disulfide (TiS2), are extensively studied for their distinctive electronic, chemical, and optical traits. TiS2, initially proposed for Li-ion batteries, holds promise for supercapacitors, although its utilization faces stability challenges in aqueous environments. Herein, electrically conducting and surface-passivated 2D 1T-TiS2 flakes were fabricated and tailored for application as electrodes in supercapacitors with enhanced durability. For this purpose, self-standing and flexible 1T-TiS2 films were fabricated using vacuum filtration and treated with dopamine (DA) to obtain electrochemically stable supercapacitor electrodes in aqueous environments. During DA treatment, in-situ generation of hydrogen peroxide (H2O2) leads to the formation of a thin titanium dioxide (TiO2) overlayer on TiS2, enhancing oxidation stability. At a scan rate of 10 mV s−1, a single electrode demonstrated a gravimetric specific capacitance of 128 F g−1, a volumetric specific capacitance of 122 F cm−3, and an areal specific capacitance of 244 mF cm−2. The symmetric supercapacitor device demonstrated an impressive capacity retention of 96.1 % after 10000 cycles and 85.5 % after 18000 cycles. These results pave the way for utilizing 2D 1T-TiS2 in aqueous environments, expanding its possible applications and holding promise for significant advancements in the field.