TY - JOUR AU - Nguyen HUYNH AU - Hoang Anh Nguyen AU - Quoc Khuong Vo AU - Anh Thu Nguyen AU - Thai Hoang NGUYEN AU - Viet Hai Le AU - Thi Thom Nguyen AU - Thi Thu Trang Nguyen AU - Thi Nam Pham AU - Dai Lam Tran AU - Trong Lu Le PY - 2023/01/15 Y2 - 2024/03/29 TI - Synthesis of composite TiO2/CNTs via sol-gel route as electrode materials for supercapacitors JF - Science & Technology Development Journal: Natural Sciences JA - STDJNS VL - 6 IS - 4 SE - Original Research DO - https://doi.org/10.32508/stdjns.v6i4.1194 UR - http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/1194 AB - Supercapacitor is considered as a promising energy storage devices because supercapacitors can provide higher power densities than lithium-ion batteries. Besides traditional carbon materials, the development of metal oxide composite materials with carbon is considered a new direction to improve the weaknesses of current supercapacitors. The metal oxide composite nanomaterial not only offers high charge storage capacity, but also improves the discharge efficiency and life cycle of the supercapacitor. In this study, TiO2/CNTs nanocomposite materials (with CNTs ratio of 0.5% and 1%, respectively) were synthesized by sol-gel route and considered as electrode materials for supercapacitor. The composite materials were investigated by structural and morphological analysis methods, which showed the addition of CNTs did not change the original material structure; besides, the presence of CNTs improve the porous structure of TiO2 to support the penetration of the electrolyte. Cyclic voltammetry results showed the efficiency of CNTs addition through the increase of specific capacitance from 171 F/g (K0 sample) to 205 F/g (K1 sample). The EIS spectrum also shows the role of CNTs in the composite when reducing the internal resistance as well as the charge transfer resistance in the high frequency region. The galvanostatis cycling performance showed that K1 (with 1% CNTs) had the highest capacitance, reaching 128 F/g and remained stable after 2000 cycles at a current density of 1 A/g in the region potential 0-1.8 V. ER -