Oxygen Vacancy Induced Bismuth Oxyiodide with Remarkably Increased Visible-Light Absorption and Superior Photocatalytic Performance

Abstract

With the increasingly serious environmental problems, photocatalysis has recently attracted a great deal of attention, with particular focus on water and air purification and disinfection. Herein, we show an electroreduction strategy to improve significantly the solar absorption and donor density of BiOI nanosheet photocatalyst by introducing oxygen vacancies. These oxygen-deficient BiOI nanosheets exhibit an unexpected red shift of about 100 nm in light absorption band and 1 order of magnitude improvement in donor density compared to the untreated BiOI nanosheets and show 10 times higher photocatalytic activity than the untreated BiOI nanosheets for methyl orange (MO) degradation under visible light irradiation. Moreover, the as-prepared oxygen-deficient BiOI nanosheets also have excellent cycling stability and superior photocatalytic performance toward other dye pollutants.

Phase Boundary Derived Pseudocapacitance Enhanced Nickel‐Based Composites for Electrochemical Energy Storage Devices

“…The Mott-Schottky plot used to identify n and p-type semiconductors shows that the Mott-Schottky slope of the Ni 3 N is >0, while that of Ni 3 S 2 is <0, indicating that our Ni 3 N is an n-type semiconductor and Ni 3 S 2 is a p-type semiconductor ( Figure S13, Supporting Information). [60] Hence, a schematic diagram of interfacial lithium storage between the n-Ni 3 N and p-Ni 3 S 2 phase boundaries is shown in Figure 7a. The lattice fringes derivative of the interface schematic diagram are also displayed in Figure 7b.…”

Band gap-engineered ZnO and Ag/ZnO by ball-milling method and their photocatalytic and Fenton-like photocatalytic activities

“…The longer excitation wavelengths could sensitize the defect sites with lower energy levels. Oxygen vacancies (or defects) play a role in the photocatalytic dye degradation [56]. M a n u s c r i p t 15 …”

Enhancing the Photocatalytic Performance of BiOClxI1−x by Introducing Surface Disorders and Bi Nanoparticles as Cocatalyst

“…Interfaces 2015, 2, 1500249 www.advmatinterfaces.de www.MaterialsViews.com (Figure 4 c). [ 24 ] Note that a new peak at 162.2 eV is observed in BiOX-15 and BiOX-18 samples, which indicating that there are Bi metal on the samples. [ 33 ] Combining with the ESR and XPS characterizations above, we can conclude that surface disorders are successfully introduced to the BiOX-15 nanosheets and can be controlled by the reduction time, which subsequently play an important role in improving the photocatalytic activity.…”

“…For example, our previous work showed that the oxygen vacancies have a critical effect on the donor density and option absorption, which signifi cantly improved photocatalytic performance. [ 24 ] However, up till date, there is no report about the combination of Bi cocatalyst and surface disorders to improve the photocatalytic performance of bismuth oxyhalides for the removal of phenol.Nonmetal doping is another approach to modify the band structure of bismuth oxyhalides, which can improve the Photocatalysis has emerged as a promising method for industrial sewage elimination. The main bottleneck of this process is the development of an effi cient, stable, and cost-effective catalyst that can oxidize pollution under visible light.…”