NiFe‐layered Double Hydroxide/Vertical Bi₂WO₆ Nanoplate Arrays with Oriented {001} Facets Supported on ITO Glass: Improved Photoelectrocatalytic Activity and Mechanism Insight

Abstract

The hole oxidation of Bi2WO6 occurs on Bi or O sites, thus, enhancing the proportion of {001} facets of Bi2WO6 in photocatalysis has received increased attention because of its promotion of the hole oxidation. In this work, we successfully fabricated {001} facets highly exposed Bi2WO6 nanoplate arrays (Bi2WO6 NAs) photoelectrode growing on indium tin oxides (ITO) substrate in situ. After electrochemical deposition of NiFe‐layered double hydroxide (LDH) on Bi2WO6 NAs, NiFe−LDH/Bi2WO6 NAs photoelectrode was also obtained for the first time. Bi2WO6 with a large proportion of {001} facets facilitate the photocatalytic oxidation reactions, and NiFe−LDH can induce photogenerated holes transfer from Bi2WO6 to NiFe−LDH simultaneously. The NiFe−LDH/Bi2WO6 NAs photoelectrode presents superior photoelectrochemical properties than pure Bi2WO6 NAs photoelectrode, which was characterized by transient photocurrent and electrochemical impedance spectroscopy (EIS) systematically. Taking bisphenol A (BPA) as a model pollutant, the NiFe−LDH/Bi2WO6 NAs photoelectrode exhibits much higher photocatalytic (PC) and photoelectrocatalytic (PEC) degradation activity than Bi2WO6 NAs photoelectrode. The PEC degradation rate of NiFe−LDH/Bi2WO6 NAs photoelectrode is 2.1 times and 4.7 times that of Bi2WO6 NAs photoelectrode under simulated solar light illumination and visible light illumination, respectively. This work proposes a new approach to construct highly efficient photoelectrode for contaminant purification.

Ag2S Nanoparticles Supported on 3D Flower-Shaped Bi2WO6 Enhanced Visible Light Catalytic Degradation of Tetracycline

“…Figure a shows the full spectrum of Bi 2 WO 6 , in which the binding energies of W, B, and O are clearly visible; there are no other elements. In Figure b,c, it can be seen that the binding energies at 159.4 and 164.8 eV correspond to Bi 4f 7/2 and Bi 4f 5/2 , respectively, which indicate that Bi exists as Bi 3+ in Bi 2 WO 6 . , The binding energies at 35.2 and 37.3 eV can be attributed to W 4f 7/2 and W 4f 5/2 , and W exists as W 6+ . , The binding energies of O 1s at 530.0 eV correspond to lattice oxygen (O–Bi and O–W); there is no other form of oxygen . In summary, the prepared Bi 2 WO 6 was a pure phase compound.…”

“…29,30 The binding energies at 35.2 and 37.3 eV can be attributed to W 4f 7/2 and W 4f 5/2 , and W exists as W 6+ . 31,32 The binding energies of O 1s at 530.0 eV correspond to lattice oxygen (O−Bi and O−W); there is no other form of oxygen. 33 In summary, the prepared Bi 2 WO 6 was a pure phase compound.…”

Directional Growth of Bi2WO6 with Highly Exposed Facets on 2D‐Co3O4 for different Properties under two Light Sources

“…Besides, Bi 2 WO 6 is a typical n-type semiconductor and can be easily compounded with other materials. [10][11][12][13] Co 3 O 4 is theoretically possible to construct p-n heterojunctions with Bi 2 WO 6 . Sun et al [14] constructed the Co 3 O 4 /Bi 2 WO 6 p-n heterojunction composite via in-situ calcination process and used it to degrade ciprofloxacin (CIP) under visible light.…”

“…prepared efficient g‐C 3 N 4 /Co 3 O 4 nano‐composite and it showed outstanding catalytic removal ability of RhB dye. Besides, Bi 2 WO 6 is a typical n‐type semiconductor and can be easily compounded with other materials [10–13] . Co 3 O 4 is theoretically possible to construct p‐n heterojunctions with Bi 2 WO 6 .…”

Interface Engineering of CoFe-LDH Modified Ti: α-Fe2O3 Photoanode for Enhanced Photoelectrochemical Water Oxidation

“…Layered double hydroxides (LDHs), which contain edge-sharing octahedral MO 6 units, are ideal candidates due to their unique layered structure and compositional versatility. Previous work has reported on introduced LDHs, such as NiFe-LDHs [ 12 ], NiCe-LDHs [ 13 ], ZnCo-LDHs [ 14 ] and CoAl-LDHs [ 15 ], onto hematite photoanodes to enhance PEC performance. Among the LDHs, CoFe-LDHs have attracted research interest for (photo)electrocatalytic water oxidation due to the synergistic effect of Fe and Co, which can enhance OER activity [ 16 , 17 , 18 ].…”