Anchoring Single Nickel Atoms on Carbon-vacant Carbon Nitride Nanosheets for Efficient Photocatalytic Hydrogen Evolution

Electron-rich pyrimidine rings enabling crystalline carbon nitride for high-efficiency photocatalytic hydrogen evolution coupled with benzyl alcohol selective oxidation

“…Moreover, the shortest average lifetime of charge carriers in CCN-Pr 40 again evidences that the introduction of electron-rich pyrimidine rings could remarkably promote photogenerated charge carrier separation and transfer. 15 These results are also supported by EPR analysis (Fig. S3).…”

“…4 Nevertheless, the fast charge carrier recombination, sluggish surface reaction kinetics, and the narrow visible photoresponse range largely limit its photocatalytic activity for water splitting. 5 To overcome these drawbacks, many effective attempts have been proposed to improve the photocatalytic activity of PCN, including crystal structure engineering, 6,7 element doping, 8 morphology tuning, 9,10 heterostructure construction, [11][12][13] and single metal atom loading, 14,15 etc. Based on boron-doped and nitrogen-deficient PCN nanosheets, Shen et al designed an all-PCN based 2D/2D Z-scheme heterojunction for efficient photocatalytic overall water splitting.…”

High Eu3+ concentration quenching in Y3TaO7 solid solution for orange-reddish emission in photonics

“…As observed previously, the energy gap values are approximately 4.8 eV (from 251 to 254 nm), which also corresponds to the range of the observed broadband and indicates the energy transfer from host lattice to Eu 3+ excited states. 47,48 Also, sharp peaks above 350 nm are characteristic of Eu 3+ f-f transitions. The bands at 360, 394, 415, 462, and 529 nm are assigned to transitions from the ground state 7 F 0,1 to 5 D 4 , 5 L 6 , 5 D 3 , 5 D 2 , and 5 D 1 , respectively.…”

“…However, as the temperature increases, and M 0 -YTaO 4 is minimally formed, Eu 3+ tends to occupy M 0 -YTaO 4 symmetry; that is, Eu 3+ substitutes Y 3+ in a C 2 site. 47,53 Although this secondary phase is not evident in the XRD analysis, the photoluminescence spectra clearly indicate the formation of a distinct phase for the samples annealed at 1100 C. Table S1 † shows the 5 D 0 / 7 F 2 / 5 D 0 / 7 F 1 intensity ratios, calculated from the respective area of each transition, tted by Lorentzian functions, for all the Eu 3+ doping concentrations and sample annealing temperatures. The samples annealed at 1100 C have lower 5 D 0 / 7 F 2 / 5 D 0 / 7 F 1 ratios than the samples annealed at 900 C mainly because fewer structural defects exist at higher annealing temperature, as discussed based on bandgap energy measurements.…”

“…6B, under 394.0 nm excitation, it is possible to activate almost only the Eu 3+ into M 0 -YTaO 4 , with C 2 symmetry. 47 Under 392.5 nm excitation, Eu 3+ ions in both hosts are activated. Even performing a time-resolved emission measurement under 392.5 nm excitation (Fig.…”