Hierarchical porous TiO2/carbide-derived carbon for asymmetric supercapacitor with enhanced electrochemical performance. (1st June 2021)

• Record Type: Journal Article
• Authors: Zhong, Wenqiang; Sun, Haoyu; Pan, Jianmei; Zhang, Yahai; Yan, Xuehua; Guan, Yi; Shen, Wei; Cheng, Xiaonong
• Is Part Of: Materials science in semiconductor processing. Volume 127(2021)
• Publication Date: 2021-06-01
• Subjects: SiOC -- Carbide-derived carbon -- Spherical TiO2 -- Asymmetric supercapacitors; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2021.105715
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: Spherical titanium oxide/carbide-derived carbon (TiO2 /CDC) composite materials with hierarchical structure were produced by a solvothermal method. CDC materials were generated by high-temperature etching of SiOC, and TiO2 microspheres grew evenly on the CDC surface. The synthesized TiO2 /CDC materials for supercapacitors show a significant improvement in electrochemical properties with a good specific capacitance (173.2 F g −1 at 1 A g −1 ) and excellent cycle stability (82% maintenance of capacitance) in the three-electrode system. Furthermore, the asymmetric supercapacitors (ASC) were constructed by using hierarchical porous CDC and TiO2 /CDC as the negative and positive electrode, respectively. The ASC device can keep the original capacitance of 85.1% after 5000 cycles and shows an outstanding long cycle life. The ASC device shows a good energy density (10.76 Wh kg −1 at 4.50 kW kg −1 ) owing to the combined function of the pseudocapacitive material and a wider potential window from asymmetric supercapacitors, which reveals its great potential application in energy storage devices. Highlights: TiO2 /CDC with hierarchical porous structure was produced by solvothermal method. The effect of TiO2 content on the electrochemical behavior of samples was obtained. The asymmetric supercapacitor device was prepared using CDC and TiO2 /CDC. The device has high energy density at high power density and good cycling life.