Amorphous WP‐Modified Hierarchical ZnIn₂S₄ Nanoflowers with Boosting Interfacial Charge Separation for Photocatalytic H₂ Evolution

Abstract

The morphology design and loading of cocatalyst are effective strategies to enhance the light absorption capacity and separation efficiency of photogenerated carriers. This work successfully fabricates amorphous tungsten phosphide (WP)/hierarchical ZnIn2S4 nanoflowers heterostructure (WP/ZnIn2S4) with boosting interfacial charge separation for photocatalytic H2 evolution. The maximum H2 production rate of 6178 µmol g–1 is achieved over 10% WP/ZnIn2S4 photocatalyst within 5 h, which is four times higher than that of pure ZnIn2S4. And a high photostability is also obtained. The enhanced photocatalytic hydrogen evolution activity can be attributed to the synergistic effect of amorphous WP and hierarchical ZnIn2S4 nanoflowers. Amorphous WP as a cocatalyst can rapidly capture photogenerated electrons on the surface of ZnIn2S4, improving the separation of photogenerated electron‐hole pairs. And the ZnIn2S4 microflower with ultrathin nanosheets structure exposes more surface sites to anchor amorphous WP nanoparticles, which provides more active sites for hydrogen evolution. Additionally, amorphous WP greatly increases the light absorption range and prolongs the fluorescence lifetime of ZnIn2S4. This work provides a new idea for designing an effective cocatalyst‐modified semiconductor to improve photocatalytic activity.

Ti3C2 MXene Induced Efficient Electron Transfer over Bimetallic Sulfides and Layered Double Hydroxides

“…The optical properties of the photocatalyst were understood by UV-vis diffuse reflectance spectroscopy (UV-vis-DRS) and the forbidden bandwidth of the photocatalyst was calculated by the equation 𝛼hv = A (hv−E g ) (n/2) (absorption coefficient (𝛼); Planck's constant (h); optical frequency (v); band gap energy (E g ); consistent (A); n is related to the material type). [57,58] As shown in Figure 7a, NA is consistent with literature reports, possessing three absorption bands, [59] and NAT possesses the same absorption bands as NA and has a more stable light absorption in the visible absorption range. After 530 nm, the light absorption intensity of ZCS is stable.…”

Construction of Double S‐Scheme ZIF‐67@GDY/CuI Heterojunction by Graphdiyne (g‐CnH2n−2) Nanosheets‐Coated ZIF‐67 on Synergized Charge Transfer for Enhanced Photocatalytic Hydrogen Evolution

“…In order to quantitatively describe the electron transfer in the sensitized system, the electron transfer rate ( k et ) was calculated by equationwhere k et is the electron transfer rate constant; τ F,s is the short lifetimes; τ F,l is the long lifetimes. [ 71 ]…”

“…where k et is the electron transfer rate constant; τ F,s is the short lifetimes; τ F,l is the long lifetimes. [71] The k et value of GZC-20 is 3.64 Â 10 9 s À1 , and the k et values of GDY, CuI, GDY/CuI, ZIF-67, ZIF-67/CuI-20, and ZIF-67@GDY-20 are 1.36, 1.45, 1.59, 2.48, 3.22, and 3.24 Â 10 9 s À1 , respectively. The k et value of GZC-20 is 1.5 times that of ZIF-67, which again confirms the existence of a fast charge transport channel between ZIF-67, GDY, and CuI, which effectively delays the recombination of the carrier and improves the photocatalytic activity of hydrogen evolution reaction.…”

Rational Construction of Electrostatic Self‐Assembly of Metallike MoP and ZnIn2S4 Based on Density Functional Theory to Form Schottky Junction for Photocatalytic Hydrogen Production

“…Therefore, when the particles can maintain good dispersion in solution, it also indicates that they have good stability. [ 37 ] Importantly, ZnIn 2 S 4 and MoP exhibit a positive and negative potential, providing the strongest evidence for electrostatic self‐assembly.…”