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Mesoporous SiO 2 nanostructure was synthesized by a simple controlled hydrolysis process. The obtained mesoporous SiO 2 nanostructure was composed of amorphous silica nanoparticles and exhibits significant light-induced adsorption performance. The light-induced adsorption enhancement may be caused by exchanging adsorption between hydroxyl groups and dye molecules because the adsorption process under light irradiation exhibits significant chemical adsorption property. Combining this mesoporous SiO 2 and rutile TiO 2 materials, the obtained hybrid photocatalyst displays superior photocatalytic degradation performance of RhB dye due to the excellent adsorption performance and the increase of surface defects on the surface of TiO 2 nanostructure. These results provide novelty route for the further design and development of high performance photocatalyst in actual application. [ABSTRACT FROM AUTHOR]

Compared with anatase phase TiO 2 , rutile phase TiO 2 is not suitable to be used as high-performance catalyst due to its disadvantages such as low carrier mobility and few active sites. However, rutile phase TiO 2 can be easily generated in the chlorine-containing solution during hydrothermal process, which is a major problem for the preparation of high-performance TiO 2 based photoelectrochemical and photocatalytic devices. In this study, we demonstrate a suppression phenomenon of anatase-to-rutile phase transition in aqueous solution induced by amorphous carbon. Amorphous carbon formed by the carbonization of glucose adhered on the primary TiO 2 grains, inhibiting the generation of rutile phase TiO 2 nanostructures in a certain degree. During subsequent calcination process, anatase phase TiO 2 formed gradually. And TiO 2 phase junction was obtained. The TiO 2 phase junction exhibits enhanced photocatalytic degradation performance of organic dyes due to the effective separation of carriers and abundant active sites. This study provides a new and feasible way for controllable fabrication of high performance anatase phase TiO 2 based photoelectrochemical and photocatalytic devices. An inhibited anatase-to-rutile phase transition process in aqueous solution has been observed, and amorphous carbon material plays an important role in this process. The obtained phase junction displays interesting photocatalytic degradation performance of rhodamine B dye. Image 1 • An inhibited A-R phase transition process in aqueous solution has been observed. • Amorphous carbon material plays an important role in this inhibition process. • The obtained TiO 2 phase junction exhibits interesting photocatalytic performance. [ABSTRACT FROM AUTHOR]

In this work, we designed a facile and label-free electrochemical biosensor based on intrinsic topological insulator (TI) Bi 2 Se 3 and peptide for the detection of immune checkpoint molecules. With topological protection, Bi 2 Se 3 could have robust surface states with low electronic noise, which was beneficial for the stable and sensitive electron transport between electrode and electrolyte interface. The peptides are easily synthesized and chemically modified, and have good biocompatibility and bioavailability, which is a suitable candidate as the recognition units for immune checkpoint molecules. Therefore, the peptide/Bi 2 Se 3 was developed as a suitable working electrode for the electrochemical biosensor. The basic performance of the designed peptide/Bi 2 Se 3 biosensor was investigated to determine the Anti-HA Tag Antibody and PD-L1 molecules. The linear detection range was from 3.6 × 10−10 mg mL−1 to 3.6 × 10−5 mg mL−1, and the detection limit was 1.07 × 10−11 mg mL−1. Moreover, the biosensor also displayed good selectivity and stability. [Display omitted] • Sensitive electrochemical biosensors combined with topological materials and peptides. • High-quality and large-scale topological crystal with few defects as electrodes. • Effective recognition units of peptides for the immune checkpoint. • A large detection range, good selectivity and stability with low detection limit of the sensing assay. • Excellent discernment in the complicated serum environment for clinical application. [ABSTRACT FROM AUTHOR]

• Novel C 2 N based electrode for Hydrogen Evolution Reaction (HER). • C 2 N based electrode has an excellent stability for HER. • Pt coated C 2 N shows a Tafel slope of 53 mV/dec and an overpotential 33 mV. In this work, a novel catalyst based on holey nitrogenated graphene (C 2 N) was developed for hydrogen evolution reaction (HER). C 2 N nanosheets were deposited on Fluorine doped Tin Oxide substrate by using a facile drop-coating method. Electrochemical tests indicated that C 2 N based work electrode exhibited excellent stability in acidic environment. To improve its catalytic performance, various noble-metal nanoparticles were deposited on the surface of C 2 N using physical vapor deposition, including Au, Cu, Co, Ni and Pt. The size most particles was observed to be 3–5 nm, which was beneficial for catalyst reaction. Among those samples with different metal particles, Pt coated C 2 N multi-catalysts exhibited an overpotential of 33 mV and Tafel slope of 53 mV/dec, which outperformed other metal particles, and also pure Pt particles or C 2 N nanosheets without metallic particles, demonstrating its great potential of multi-catalyst Pt/C 2 N for HER application. [ABSTRACT FROM AUTHOR]