Remarkable supercapacitive performance of TiO2 nanotube arrays by introduction of oxygen vacancies

One-pot synthesis of nickel-cobalt hydroxyfluorides nanowires with ultrahigh energy density for an asymmetric supercapacitor

“…4h shows the typical Bode phase plots of the Ni-HF, Co-HF and NiCo-HF electrodes. They are quite different from the ideal capacitive behaviour of capacitor-type electrode which exhibits almost vertical line on the Nyquist plot and the phase angle of about À90°on the Bode plot [37]. The phase angles of the Bode plots for the Ni-HF, Co-HF and NiCo-HF electrodes are far below the value of À90°, further demonstrating the battery characteristic behaviour of the electrodes.…”

Electrochemical hydrogenated TiO2nanotube arrays decorated with 3D cotton-like porous MnO2enables superior supercapacitive performance

“…The peaks centered at 529.90 and 531.53 eV for both air-TNTAs and EH-TNTAs are attributed to Ti-O and surface Ti-OH groups. 40,43,44 There is no noticeable difference in the peak at 531.53 eV between air-TNTAs and EH-TNTAs, implying that the hydrogenation process does not change the surface species of EH-TNTAs. Mn 2p XPS spectra of MnO 2 /EH-TNTAs reveals two peaks located at 642.3 and 654.0 eV (Fig.…”

Electrospun TiO2 nanofiber electrodes for high performance supercapacitors

“…In contrary, pseudocapacitors have performed substantially higher capacitance of 300-1200 Fg −1 through faradaic storage mechanism [15]. The transition metal oxides such as RuO 2 [16], MnO 2 [17], NiO x [18], Co 3 O 4 [19], CuO x [20], Fe 2 O 3 [21], MoO 3 [22], V 2 O 5 [23], Li 2 TiO 3 [24] and TiO 2 [25] etc, conductive polymers and polyaniline are commercially used pseudocapacitor compounds [26][27][28]. Among them TiO 2 is ubiquitous material for the supercapacitor applications.…”