Alkali metal modified carbon nitride enhance photocatalytic performance for highly selective oxidation of benzyl C(sp)-H bonds

Dual Defective K-Doping and Cyano Group Sites on Carbon Nitride Nanotubes for Improved Hydrogen Photo-Production

“…The reason for this phenomenon may be that the electron density of the N–CN coordination adjacent to the cyano group decreases due to the electron-withdrawing effect of the −CN units . In Figure b, the N 1s spectrum of CNNTs can be divided into four characteristic peaks at 398.79, 399.85, 400.89, and 404.42 eV, referring to nitrogen atoms in the sp 2 CN–C, N–(C) 3 , −NH x species and π-excitations charge effects, respectively . However, the peaks of N–(C) 3 and −NH x in K-CNNTs shift to higher binding energies due to the electron-withdrawing effect of −CN groups and the interaction between potassium ions and N atoms .…”

“…38 In Figure 4b, the N 1s spectrum of CNNTs can be divided into four characteristic peaks at 398.79, 399.85, 400.89, and 404.42 eV, referring to nitrogen atoms in the sp 2 C�N−C, N−(C) 3 , −NH x species and π-excitations charge effects, respectively. 39 However, the peaks of N−(C) 3 and −NH x in K-CNNTs shift to higher binding energies due to the electron-withdrawing effect of −C�N groups and the interaction between potassium ions and N atoms. 40 The K 2p spectrum of K-CNNTs can be divided into two typical peaks centered at 295.58 and 293.28 eV, assigning to K 2p 1/2 and K 2p 3/2 states, respectively, which suggests that K elements have been doped in CNNTs structure in the form of K−N bond (Figure 4c).…”

Porous carbon nitride rods as an efficient photoanode for water splitting and benzylamine oxidation

“…2g), further indicates the presence of new states in the band gap, which is responsible for the decrease in the average lifetime. 35,36 Fig. 2h presents the PL spectra of the CN lms.…”