Interface engineering: NiAl-LDH in-situ derived NiP2 quantum dots and Cu3P nanoparticles ingeniously constructed p-n heterojunction for photocatalytic hydrogen evolution

Cobalt Nanoparticles Encapsulated in Hollow Carbon Nitride Nanotubes for Efficient Photocatalytic Hydrogen Evolution

“…As described by the high resolution XPS spectrum of C 1 s in Figure 3B, the binding energies of C 1 s in CN x appear at 288.1 and 284.6 eV, respectively, corresponding to the N═C—N bond and C—C bond of sp 2 hybridization. [ 31,32 ] The binding energies of C 1 s in the composite catalyst Co/CN x ‐42 appear at 285.3 and 284.7 eV corresponding to C—N and C—C bonds, respectively. In Figure 3C, the N 1 s binding energies of CN x are 398.2 eV, 398.9 eV (C—N═C), 400.9 eV (N—H), and 403.8 eV ( π ‐excitation), respectively.…”

Novel CuBr-assisted graphdiyne synthesis strategy and application for efficient photocatalytic hydrogen evolution

“…This result indicates that the composite of GDY–CuBr has both p-type and n-type semiconductor properties, confirming the formation of the p–n heterojunction between CuBr and GDY. 50 More importantly, the GDY–CuBr shows a negative shift in flat band potential than pure CuBr (2.08–1.18 V), and a positive shift compared to GDY (−0.52–0.50 V), which illustrates that the Fermi level of p-type CuBr shifts upward while that of the n-type GDY shifts downward along with the energy bands in the hybrid material. The above analysis could indicate that the p–n heterojunction between CuBr and GDY was successfully constructed.…”

“…The scanning electron microscope (SEM) and transmission electron microscope (TEM) characteristic tests were performed to investigate the morphological properties of GDY–CuBr. 50 The SEM images of GDY–CuBr in Fig. 3a and b show that its primary morphology is lamellar.…”

“…After deducting the linear background, the Cu 2p spectra in GDY–CuI can be fit into two peaks at 932.92 eV and 952.71 eV, which can be attributed to Cu 2p 3/2 and Cu 2p 1/2 . 50,56 The peak positions of the fitted curve obtained after subtracting the linear background for GDY–CuBr are 933.07 eV, 934.9 eV, 940.46 eV, 944.57 eV, 952. 98 eV, 955.3 eV, and 963.22 eV.…”

“…Furthermore, the peak intensity of the fluorescence spectrum can reflect the degree of electron–hole recombination. 50,52 Correspondingly, a decrease in peak intensity means a decrease in the recombination ratio of electrons and holes, and it also means an increase in separation efficiency. 71 Fig.…”