Few-layer graphitic carbon nitride for enhanced visible-light photocatalytic efficiency: the role of narrow bandgap and nitrogen-vacancies

Abstract

Graphitic carbon nitride (g-C3N4) was a famous photocatalyst with vast perspectives in the field of visible-light photocatalysis, while the actual performance was inhibited by the feeble efficiencies in charge-carriers separation...

Promoted photo-Fenton reactivity through electron transfer between non-contacted Au nanoparticles and Fe2O3 nanowires in a confined space

“…The transient photocurrent responses of Fe 2 O 3 –Au@SiO 2 exhibited the highest photocurrent signals, which was indicative of the highest separation efficiency of charge carriers. 42 The EIS Nyquist plots showed that Fe 2 O 3 –Au@SiO 2 had the smallest impedance arc radius among the three catalysts (Fig. 3c), suggesting weaker interfacial charge transport resistance and faster migration of electrons.…”

“…40 In the XPS spectrum of O, the main peak of the O 1s orbital was divided into three peaks, whose electron binding energy was located at 530.0 eV, 531.8 eV and 532.9 eV, representing lattice O, OH and absorbed H 2 O, respectively. 41 To explore the photovoltaic properties in the light-harvesting process and the charge separation and transfer efficiency, PL 42 The EIS Nyquist plots showed that Fe 2 O 3 -Au@SiO 2 had the smallest impedance arc radius among the three catalysts (Fig. 3c), suggesting weaker interfacial charge transport resistance and faster migration of electrons.…”

Crystallinity regulation-induced organic degradation on ultra-thin 2D Co3O4/SiO2 nanosheets: the critical trigger of oxygen vacancies

“…These properties allow it to be a promising confined template to directly grow 2D nanosheets. 41 Typically, 1.0 g CoCl 2 ·6H 2 O with 1.0 g template RUB-15 was mechanically ground uniformly, calcined at 500 °C at a rate of 2 °C min −1 in a tube furnace, and then was kept under 500 °C for 360 min. The calcination atmosphere was varied according to actual demand, as A-Co 3 O 4 /SiO 2 , hemi-Co 3 O 4 /SiO 2 , and C-Co 3 O 4 /SiO 2 were obtained with pure Ar, gas mixture (Ar : air = 1 : 2) and pure air, respectively.…”

Nitrogen‐Based Imperfections in Graphitic Carbon Nitride – New Trend for Enhancing Photocatalytic Activity?

“…Furthermore, in our comprehensive analysis of charge separation dynamics, the concurrent decrease in both PL and TRPL intensities serve as an indicative measure of diminished recombination and improved charge separation. The existence of midgap states in N‐vacancy CN synthesized through diverse methods including thermal condensation utilizing a covered ceramic arc, [133] acetamide‐ or formamide‐assisted in situ approaches, [99] a three‐step thermal exfoliation method, [62] polycondensation using RUB‐15 template, [168] and Molten salt‐assisted method [169] has been verified. Additionally, the impact of these midgap states on the photocatalytic activity of CN was carefully investigated.…”