TiO 2 Nanowire Arrays on Titanium Substrate as a Novel Binder-free Negative Electrode for Asymmetric Supercapacitor

True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors

“…For example, titanium dioxide (TiO 2 ) can be considered as a promising electrode material for HSSCs due to its excellent electrochemical stability at negative potential range (up to −1.6 V versus SCE) in neutral aqueous electrolytes. [ 247–249 ] However, most of the TiO 2 polymorphs exhibit the tunnel‐type structure or layered structure constructed by the corner‐shared or edge‐shared [TiO 6 ] octahedra chains ( Figure a). The compact crystal structures of these TiO 2 polymorphs with small interlayer spaces and tight (1 × 1) tunnels suffer from slow ion diffusion in the crystal, leading to low specific capacitance and poor rate‐performance.…”

Design and Synthesis of Hierarchical SiO2@C/TiO2 Hollow Spheres for High-Performance Supercapacitors

“…Moreover, the slope of the straight line associated with the HSCT electrode is larger than those of hollow TiO 2 and HST electrodes and closer to the imaginary impedance axis, indicating a swift ion diffusion in the electrolyte and the adsorption onto the electrode surface, which suggests a lower diffusion resistance and an ideal capacitive behavior of the HSCT hybrid electrode. 50 The excellent performance of the HSCT electrode material that we present here should be attributed to the following reasons: (1) HSCT occupies a considerably more accessible surface area (116.4 m 2 g −1 ) than hollow TiO 2 (17.6m 2 g −1 ) and HST (82.1m 2 g −1 ), which allows efficient ion intercalation/ deintercalation, promotes electrolyte access, and provides more channels for ion and electron transfer; (2) carbon species between inner SiO 2 and outer TiO 2 as shown in Figure 4a can accelerate electronic transport among TiO 2 materials because of its better electrical conductivity, thus contributing to the total capacitance; (3) the introduction of oxygen vacancy (Ti 3+ sites) states is beneficial for the increase of specific capacitance (Figure 2c) because of the great redox activity and rich polymorphism of the electrode material; (4) the void spaces and hierarchical structure on the interlayers and inner hollow spaces can not only serve as an "ion reservoir" to facilitate the transportation of KOH electrolyte ions but also withstand the volume change during the charge/discharge process, as shown in Figure 4b. Electrochemical Properties of the HSCT//AC Asymmetric Supercapacitor.…”

An antibacterial platform based on controllable electro-mechanical interactions at the materials/bacteria interface

“…Theoretically, thermal convection in the solution and corresponding thermal diffusion of the solute account for the different alignment of the nanowires. The horizontally placed substrates are located on the edge of the convection, whereas the vertically placed ones are at the center part of the convection where the larger diffusion rate promotes reactant etching of the substrate [47][48][49] . Therefore, TOV is etched more quickly and faster TiO 2 (anatase) precipitation generates more nanowires with a larger density to foster closer alignment and avoid signi cant inclination.…”