Research progress on the formation, detection methods and application in photocatalytic reduction of CO2 of oxygen vacancy

Electrochemical reduction of carbon dioxide to multicarbon (C2+) products: challenges and perspectives

“…Although tremendous efforts have been made to design anionic vacancies, the C 2+ selectivity is still unsatisfactory. 95 The design of multi-vacancies or coupling of multiple type vacancies (anionic and cationic vacancies) to optimize the migration pathway of reaction intermediates (*COH, *CHO, *COOH) represents a promising research direction for enhanced performance toward C 2+ synthesis.…”

“…Although tremendous efforts have been made to design anionic vacancies, the C 2+ selectivity is still unsatisfactory. 95 The design of multi-vacancies or coupling of multiple type vacancies (anionic and cationic vacancies) to optimize the migration pathway of reaction intermediates (*COH, *CHO, *COOH) represents a promising research direction for enhanced performance toward C 2+ synthesis. Furthermore, as there is no preferred facet orientation on nanostructured materials, high-density defects, grain boundaries, and surface roughness are considered to determine the final catalytic behavior.…”

Cu-doped mesoporous SnO2 nanoparticles with rich grain boundaries and oxygen vacancies for photocatalytic CO2-to-CO conversion

“…Firstly, the photogenerated charges can be effectively separated under coexisting conditions of both oxygen vacancies and mixed valence state Cu + /Cu 2+ . In particular, the rich oxygen vacancy can provide a fast channel for the separation and transfer of photogenerated charges, and also capture the photogenerated electrons, 40,41 thus greatly enhancing the production of photogenerated electrons. Secondly, the molecular CO 2 can be enriched into the mesoporous channels of the sample owing to the confined effect, and the highly concentrated adsorption of CO 2 molecules on the catalyst plays an important role in improving the photocatalytic reduction activity of CO 2 .…”

Progress and Outlook of Surface Engineering Strategies in Photocatalytic Materials for Mercury Removal: A Review

“…Inducing oxygen vacancies as an effective strategy to enhance photocatalytic activity has been widely studied by a large number of scientists . Oxygen vacancies not only act as electron capture centers effectively inhibiting the compounding of electron and hole pairs but also form defective energy levels below the conduction band of the photocatalyst, which is more favorable for electron transport and transfer. − Liccardo et al . obtained TiO 2 photocatalysts with defective structures by a hydrogenation strategy, and photoelectron spectroscopy analysis revealed the presence of oxygen vacancies.…”

“…With the goal of “carbon neutrality” and “carbon peaking”, controlling CO 2 emissions is a very urgent need to control environmental pollution. Photocatalytic reduction of CO 2 is the conversion of CO 2 into useful chemical products such as carbon monoxide, methane, and methanol with the use of light energy. , As with the photocatalytic oxidation of Hg 0 , it is equally important to design highly active photocatalysts in the photocatalytic reduction of CO 2 . It has been concluded that surface engineering strategies to modify conventional semiconductor materials can promote CO 2 adsorption and activation.…”