Synthesis of KNbO3/g-C3N4 composite and its new application in photocatalytic H2 generation under visible light irradiation

Visible-light photocatalytic hydrogen production in a narrow-bandgap semiconducting La/Ni-modified KNbO3 ferroelectric and further enhancement via high-field poling

“…44 Therefore, the x = 0.01 sample with the highest orthorhombic phase fractions and the strongest ferroelectric built-in field possessed the highest photocurrent value amongst all the samples. Similar to previous reports, 45 the transient photocurrent was unstable due to the loose contact of ceramic powders. For the poled materials, the corresponding transient photocurrents of approximately 0, 90.2, 50.4, 38.4 and 21.8 µA are presented in Fig.…”

NiCo2O4/g‐C3N4 Heterojunction Photocatalyst for Efficient H2 Generation

“…This contact interface promoted the transfer of charges and shortened the distance, indicating that a heterojunction was successfully constructed between g‐C 3 N 4 and NiCo 2 O 4 . [ 41,42 ] Figure 3f shows the HRTEM image of CN‐5%, revealing a lattice distance of 0.246 nm, which was assigned to the (311) crystal face of NiCo 2 O 4 . Figure 3g shows the elemental mapping images of CN‐5% for the elements C, N, O, Co, and Ni, proving that the NiCo 2 O 4 nanospheres were successfully loaded on g‐C 3 N 4 .…”

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C3N4/KNbO3 heterojunction photocatalyst

“…. For the KNO sample (black line), the strong diffraction peaks at 22.1°, 31.5°, 45.2°, 50.9°, 56.9° and 65.8° are corresponding to (110), (111), (220), (221), (311) and (222) planes of orthorhombic phase of KNO (JCPDS 32‐0822), respectively. In addition, two distinct diffraction peaks at 13.1° and 27.4° that be indexed to (100) and (002) planes can be seen from the pattern of CN (red line), which are attributed to interlaminar reflection of repetitive molds in aromatic plane and graphite structures .…”

“…XRD patterns were performed to confirm the crystallographic phase and structure of CN, CNx, KNO and KNO/CNx composites, as shown in Fig. 1 37 respectively. In addition, two distinct diffraction peaks at 13.1°and 27.4°that be indexed to (100) and (002) planes 38 can be seen from the pattern of CN (red line), which are attributed to interlaminar reflection of repetitive molds in aromatic plane and graphite structures.…”

“…The HRTEM image (Fig. 4(c)) of KNO/CNx composite exhibits that KNO lattice fringe spacing is 0.284 nm, corresponding to KNO plane (111), 37 but the lattice fringes cannot be observed by CNx because of its low crystallinity. 43 Additional high-angle annular dark-field imaging scanning transmission electron microscopy (HAADF-STEM) and crosssection elemental mapping images for 3% KNO/CNx composite are shown in Fig.…”