Explore the vast range of titles available.

This essay is a brief recounting of the author's book, Cari Gara Gara .

The concern over increasing environmental contamination by dye agents from textile industries, such as Reactive yellow 105, requires a special catalyst that can rapidly and effectively eradicate the dye chemical. Here, we demonstrate a new design of catalyst, i.e., Te doped TiO 2 /Ti composite electrode, that promotes highly active charge transfer with the Reactive yellow 105 dye for efficient photoelectrocatalytic degradation under visible light irradiations. Our results show that the new photocatalyst effectively degrades up to 90% of 0.5 ppm of the Reactive yellow 105 dye under visible light irradiation within 60 min, which is equivalent to the degradation rate constant of 0.0611 M -1  min -1 . It is impressively higher than the pristine photocatalyst (TiO 2 /Ti) of which it only degrades 70 and 65% of dye compound under UV and Vis irradiation respectively or equivalent to degradation kinetic rate as low as 0.037 and 0.0361 M −1  min −1 , respectively. The degradation of dye compound is enhanced to 100% when the new catalyst is applied in photoelectrocatalytic degradation process under visible light irradiation or approximately 95% degradation under UV light irradiation. The Te doped TiO 2 /Ti photoelectrocatalyst can be a new platform for rapid Reactive yellow 105 dye contamination in the environment. Graphical abstract Te doping enhances visible photoactivity of TiO 2 nanotube on Ti electrode.

The photoelectrocatalytic (PEC) degradation of rhodamine B (RhB) organic dye using manganese (Mn)-nitrogen (N) doped titanium oxide (TiO 2 ) electrode was investigated under two applied electrochemical modes such as cyclic voltammetry (CV) and linear-sweep voltammetry (LSV). The synergetic effect between light variation and photocurrent response demonstrated that the TiO 2 thin films were active under the ultraviolet (UV) light illumination with a photocurrent value ( I pa ) of 2.65 µA; meanwhile, the Mn–N–TiO 2 was periodically activated under visible (Vis) light illumination with I pa of 3.63 µA. In addition, the photolysis was evaluated to compare the degradation effect under varying light illuminations without catalyst with the PEC system. The good ability of TiO 2 to degrade RhB under UV light was found with a percentage degradation value at 0.5 mg L –1 of 63%. In comparison, the Mn–N–TiO 2 was activated under Vis light with 0.5 mg L –1 of 74.2%.

In this work, we aim to study and improve the electrochemical performance of a unique thin film-structured composite nitrogen-doped graphene (NGr) combined with NiO/TiO 2 hollow nanospheres coupled by synergistic hydrothermal method. NGr@NiO/TiO 2 nanocomposites have been successfully synthesized as indicated by their characteristics through several rational characterization techniques such as the morphological shape of NiO/TiO 2 hollow nanospheres that are evenly distributed on the surface of N-graphene with particle distribution in the range of 79.78–362.13 nm with an average diameter of 130 nm. In addition, the crystal structures of carbon from NGr, NiO, and TiO 2 (anatase and rutile) have been confirmed and proven by spectra showing the presence of C–N stretching primary amides (1400 cm −1 ), Ni–O stretching (700 cm −1 ) and Ti–O–Ti bond (425 cm −1 ), respectively. To enhance the performance of cyclic voltammetry (CV) in electrochemical testing, adjustments are made to parameters such as cycle effect, scan rate, and composition, ensuring the production of reversible voltammograms under each condition. The results indicate that reversible voltammograms are observed under each condition, with a composite ratio of 80:15:5 (wt%). Slower scan rates are associated with higher specific capacity (Cps), with the Cps values for the NGr@NiO/TiO 2 electrode being 741.02 F/g (80:10:10), 408.53 F/g (80:5:10), and 839.83 F/g (80:15:5), respectively. However, the highest Cps is recorded for NGr@NiO at 1959.71 F/g. Based on these findings, it is revealed that further comprehensive electrochemical testing of the NGr@NiO/TiO 2 nanocomposite is necessary, to fully explore its potential and applicability in the development of alkaline ion batteries (AIBs) such as Li/Na/K.