Publications Repository - Gdańsk University of Technology

The long cycle life stability jointly with high energy density are limiting broader feasible applications of supercapacitors. The novel diamondized titania nanocomposite supercapacitors deliver high power and energy densities along with high capacitance retention rates. Supercapacitor electrodes were fabricated utilizing a combination of Ti anodization followed by chemical vapor deposition resulting in simultaneous growth of complex BDD/TiC interface. The first-principles simulations along with extended molecular investigations conducted by BF-TEM and HR-SEM revealed that capacitive phenomena are delivered by nanoporous, multi-faceted, and substoichiometric TiC, forming clusters at the lateral surfaces of titania nanotubes. Next, TiC mechanical stability and effective charge transfer electrode-electrolyte are efficiently provided by highly conductive although discontinuous BDD overlayer. The assembled two-electrode supercapacitor devices exhibited capacitance 15 mF cm−2, which were stable at 0.1 V s−1 scan rate in various neutral aqueous electrolytes. The composite TiO2NT-BDD supercapacitors showed outstanding long-term cycling stability with capacitance retention of 93% after 100,000 chronopotentiometry cycles verified by post-aging cyclic voltammetry tests. In parallel, the energy and power density calculated at a current density of 3 A g-1 achieved levels as high as 14.74 Wh kg-1 and 24.68 kW kg-1, revealing the superior performance of the assembled devices compared to recently reported supercapacitors.

Authors

• dr hab. inż. Robert Bogdanowicz link open in new tab ,
• dr inż. Anna Dettlaff link open in new tab ,
• Franciszek Skiba,
• dr inż. Konrad Trzciński link open in new tab ,
• dr inż. Mariusz Szkoda link open in new tab ,
• dr hab. inż. Michał Sobaszek link open in new tab ,
• dr inż. Mateusz Ficek link open in new tab ,
• dr inż. Bartłomiej Dec link open in new tab ,
• Łukasz Macewicz link open in new tab ,
• Dongsheng Geng,
• Arkadiusz Ignaczak,
• dr hab. inż. Jacek Ryl link open in new tab