Development of γ-Al₂O₃ with oxygen vacancies induced by amorphous structures for photocatalytic reduction of CO₂

Abstract

Inducing amorphous components into Al2O3 leads to elongation of Al-O bond and formation of oxygen vacancies, which makes Al2O3 to be independent photocatalyst for CO2 adsorption and reduction. The generation...

Carbon Dot/Al2O3 Nanocomposites with an Enhanced Lifetime, Phosphorescence Quantum Efficiency, and Stability for Anticounterfeiting Applications

“…The results imply that the electron transfer from CDs/Al 2 O 3 -900 to H 2 O 2 was accelerated, which may be derived from the enhanced photophysical process of CDs/Al 2 O 3 -900, leading to the elevation of the oxidation reaction rate of TMB by H 2 O 2 . This property may broaden the applications of CDs/Al 2 O 3 -900 in the photocatalytic field . Except for the effect of the Al 2 O 3 matrix, the surface and edge configurations of CDs appear as discrete energy levels inside the band gap, leading to the excitation-dependent phosphorescence, as illustrated in Figure v …”

“…49 This property may broaden the applications of CDs/Al 2 O 3 -900 in the photocatalytic field. 50 Except for the effect of the Al 2 O 3 matrix, the surface and edge configurations of CDs appear as discrete energy levels inside the band gap, leading to the excitation-dependent phosphorescence, as illustrated in Figure 5v. 51 Based on the ultralong phosphorescence afterglow time of up to 22 s, excellent stability under harsh environments, and excitation-dependent phosphorescence emission, the fabricated CDs/Al 2 O 3 -500 could be readily applied for time-resolved multicolor anticounterfeiting.…”

Layered double hydroxides‐based Z‐scheme heterojunction for photocatalysis

“…(1) light harvesting; (2) separation and migration of photogenerated carriers; (3) reactant adsorption; (4) redox reaction; and (5) production desorption. [12][13][14] Factors that hinder the improvement of photocatalytic activity mainly lie in inadequate light responsiveness, lower quantum efficiency, and weak redox capability. 15 Thus, selecting appropriate photocatalytic materials and designing property photocatalyst structure are keys for improving abovementioned drawbacks.…”

Femtosecond transient absorption spectroscopy investigation into the electron transfer mechanism in photocatalysis

“…4,5 Solar energy is widely distributed and abundant in reserves, and solar energy conversion becomes a hot topic. [6][7][8][9] Recently, semiconductor photocatalysis has emerged as a green technology that converts solar energy into chemical fuels with a high calorific value at ambient temperature and pressure. [10][11][12] For instance, photocatalytic water splitting can produce hydrogen (H 2 ) from water, and photocatalytic carbon dioxide (CO 2 ) reduction can convert CO 2 into carbon monoxide (CO) and hydrocarbons.…”