Bi₂S₃-Nanowire-Sensitized BiVO₄ Sheets for Enhanced Visible-Light Photoelectrochemical Activities

Abstract

BiVO 4 is widely used for photoelectrochemistry and photocatalytic oxygen evolution under visible-light irradiation. To extend the range of visible-light absorption and reduce the recombination rate of photoexcited electrons and holes, a BiVO 4 sheet−Bi 2 S 3 nanowire heterostructure was fabricated through an easy in situ hydrothermal method. In this method, Bi 2 S 3 nanowires were uniformly coated onto the surface of BiVO 4 sheets. The heterostructure exhibits a wide visible-light absorption band ranging from 525 to 900 nm after coupling with Bi 2 S 3 nanowires. The BiVO 4 sheet−Bi 2 S 3 nanowire heterostructures were used for photoelectrochemical measurements and exhibited higher photocurrent intensity than those of BiVO 4 sheets and BiVO 4 particle−Bi 2 S 3 under visible-light irradiation. The optimized amount of Bi 2 S 3 in the heterostructure was approximately 2.4 at. %. The remarkable enhancements in the photoelectrochemical property were attributed mainly to the solid sensitization of Bi 2 S 3 nanowires providing a number of photoexcited electrons, shortening transport distance in BiVO 4 sheets, smoothening migration along Bi 2 S 3 nanowires, and enhancing the synergistic effect between BiVO 4 and Bi 2 S 3 .

In-Situ Noble Fabrication of Bi2S3/BiVO4 Hybrid Nanostructure through a Photoelectrochemical Transformation Process for Solar Hydrogen Production

“…The results of FESEM and XPS unanimously prove that the Bi 2 S 3 has been successfully covered on the surface of BiVO 4 and forms the Bi 2 S 3 /BiVO 4 heterostructure. However, in ABV2, the Bi 4f 7/2 and Bi 4f 5/2 peaks shift toward the high banding energy, which could be attributed to the electronic shielding effect and probably formed the chemical bonds of O–Bi–S in Bi 2 S 3 /BiVO 4 heterostructure . As shown in Figure c, the XPS patterns of V 2p show that splitting peaks at 516.5 and 524.2 eV of V 2p 3/2 and V 2p 1/2 are attributed to the surface V 5+ species, respectively.…”

“…reported the BiVO 4 –Bi 2 S 3 heterojunction by a two-step method (drop casting and hydrothermal method). However, in this case, even though they reported the enhanced photocurrent density in 0.35 M Na 2 SO 3 and 0.25 M Na 2 S electrolyte, the photocurrent stability is very poor . Also, Wang et al prepared the slurry of BiVO 4 nanosheet/Bi 2 S 3 nanorod heterostructures using a two-step hydrothermal method, and then, the prepared slurry was deposited on fluorine-doped tin oxide (FTO) by doctor-blade method.…”

3D Array of Bi2S3 Nanorods Supported on Ni Foam as a Highly Efficient Integrated Oxygen Electrode for the Lithium‐Oxygen Battery

“…Transmission electron microscopy (TEM) image of a typical Bi 2 S 3 nanorod is shown in Figure b, which shows that the diameter of nanorod is 83 nm. High‐resolution TEM (HRTEM) image of a typical Bi 2 S 3 nanorod is shown in Figure c and the lattice fringes with a d ‐spacing of 0.35 nm are observed, corresponding to the (130) crystal plane of Bi 2 S 3 . Selected area electron diffraction (SAED) pattern (Figure d) also reflects the crystallinity of Bi 2 S 3 with bright rings corresponding to (240), (130), and (120) planes of binary Bi 2 S 3 .…”

Au‐Mediated Composite In2S3–Au–BiVO4 with Enhanced Photocatalytic Activity for Organic Pollutant Degradation

“…The calculated band positions of BiVO 4 and In 2 S 3 are summarized in Table . The band gaps of BiVO 4 and In 2 S 3 are consistent with the previous literatures ,…”