Herein, we report the development of a hydrogenated MoS QD-TiO (HMT) heterojunction as an efficient photocatalytic system via a one-pot hydrothermal reaction followed by hydrogenation. This synthetic strategy facilitates the formation of MoS QDs with an enhanced band gap and a proper heterojunction between them and TiO, which accelerates charge transfer process. Hydrogenation leads to oxygen vacancies in TiO, enhancing the visible light absorption capacity through narrowing its band gap, and sulfur vacancies in MoS, which enhance the active sites for hydrogen adsorption. Due to the band gap reduction of hydrogenated TiO and the band gap enhancement of the MoS QDs, the energy states are rearranged to create a reverse movement of electrons and holes facilitated the charge transfer process which enhance life-time of photo-generated charges. The photocatalyst showed stable, efficient and exceptionally high noble metal free sunlight-induced hydrogen production with a maximum rate of 3.1 mmol g h. The developed synthetic strategy also provides flexibility towards the shape of the MoS, e.g. QDs/single or few layers, on TiO and offers the opportunity to design novel visible light active photocatalysts for different applications.
Herein we report a simple synthetic protocol for N‐doped yellow TiO2 (N‐TiO2) hollow spheres as an efficient visible‐light‐active photocatalyst using aqueous titanium peroxocarbonate complex (TPCC) solution as precursor and NH4OH. In the developed strategy, the ammonium ion of TPCC and NH4OH acts as nitrogen source and structure‐directing agent. The synthesized N‐TiO2 hollow spheres are capable of promoting the synthesis of active esters of N‐hydroxyimide and alcohol through simultaneous selective oxidation of alcohol to aldehyde followed by cross‐dehydrogenative coupling (CDC) under ambient conditions upon irradiation of visible light. It is possible to develop a novel and cost‐effective one‐pot strategy for the synthesis of important esters and amides on gram scale using the developed strategy. The catalytic activity of N‐TiO2 hollow spheres is much superior to that of other reported N‐TiO2 samples as well as TiO2 with varying morphology.
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