Vacancy-modified g-C₃N₄and its photocatalytic applications

Abstract

As an emerging semiconductor-based catalyst, g-C3N4 has attracted significant attention in visible-light-driven photocatalytic energy conversion, synthesis of chemicals, and environmental remediation. While pristine g-C3N4 exhibits a weak response to visible...

Delineating the Role of Vacancy Defects in Increasing Photocatalytic Hydrogen Production in an Amorphous Metal–Organic Framework Coordinated Graphitic Carbon Nitride

“…As seen in Figure d, an additional absorption band known as the Urbach tail ranging from 450 to 600 nm is formed in N v CN, and the absorption edge at around 470 nm is blue-shifted to 450 nm in the case of C v CN compared to CN. With longer wavelength, a red shift in the Urbach tail edge is observed with increasing nitrogen vacancies, and for carbon vacancies, a blue shift in light absorption edge is usually reported . For aNi-MOF, an intense absorption band centered at 455 nm is observed due to the 3 T 1 (F) → 3 A 2 (P) d–d transition.…”

“…With longer wavelength, a red shift in the Urbach tail edge is observed with increasing nitrogen vacancies, and for carbon vacancies, a blue shift in light absorption edge is usually reported. 50 For aNi-MOF, an intense absorption band centered at 455 nm is observed due to the 3 T 1 (F) → 3 A 2 (P) d−d transition. Furthermore, a broader and stronger absorption tail, starting at ≈550 nm and extending to the near-IR (NIR) region (800−1400 nm), is also clearly observed for the g-C 3 N 4 /aNi-MOF composites (C v CN/aNi, CN/aNi, and N v CN/aNi).…”

Activating photocatalytic hydrogen evolution by constructing Ni-based organic layers and tailoring its crystal facets

“…Generally, TiO 2 and C 3 N 4 are promising UV and visible-response semiconductors and widely useful photosensitizers. [71][72][73] However, without any cocatalyst, individual TiO 2 and C 3 N 4 showed lower hydrogen production (Fig. 4(a)), possibly due to the sluggish hydrogen evolution kinetics.…”

Green synthesis of 3D core–shell SnS2/SnS-Cd0.5Zn0.5S multi-heterojunction for efficient photocatalytic H2 evolution

“…9,10 At present, the research on photocatalysts is mainly affected by insufficient visible light absorption, low charge separation efficiency, and instability caused by photo-corrosion. In numerous reports, we found that Zn 0.5 Cd 0.5 S, 11 Mn x Cd 1− x S, 12,13 black TiO 2 , 14 and C 3 N 4 15 were the widely explored photocatalysts.…”

“…9,10 At present, the research on photocatalysts is mainly affected by insufficient visible light absorption, low charge separation efficiency, and instability caused by photo-corrosion. In numerous reports, we found that Zn 0.5 Cd 0.5 S, 11 Mn x Cd 1−x S, 12,13 black TiO 2 , 14 and C 3 N 4 15 were the widely explored photocatalysts. As an ideal candidate, the ternary solid solution of a typical Cd x Zn 1−x S with a tunable bandgap and band position has been extensively studied and reported.…”