Overcoming instability challenges of binder-free, self-standing 1T-TiS2 electrodes in aqueous symmetric supercapacitors through dopamine functionalization

Date

2025-03-01

Author

Ucar, Ali Deniz
Baglicakoglu, Sumeyye Kandur
Durukan, Mete Batuhan
Cugunlular, Murathan
Öz, Sena
Kocak, Yusuf
Ülgüt, Burak
Ozensoy, Emrah
Ünalan, Hüsnü Emrah

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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.

Subject Keywords

Dopamine functionalization, Supercapacitors, Titanium disulfide, Transition metal dichalcogenides

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85215540459&origin=inward
https://hdl.handle.net/11511/113640

Collections

Department of Metallurgical and Materials Engineering, Article