Immobilization of Metal–Organic Framework MIL-100(Fe) on the Surface of BiVO₄: A New Platform for Enhanced Visible-Light-Driven Water Oxidation

Abstract

The development of new dual functional photocatalysts is highly desirable for conversion and storage of solar energy. Herein, we first constructed hierarchical structure MIL-100(Fe)@BiVO 4 in situ growing MIL-100(Fe) nanoparticles (NPs) on the surface of decahedron BiVO 4 under mild hydrothermal conditions. The as-synthesized hybrid nanostructure is unambiguously determined using a series of characterization methods. These results demonstrate that the ultra-tiny MOF MIL-100(Fe) particles are immobilized on the surface of decahedron BiVO 4 and the composite exhibits a strong interaction between BiVO 4 and MIL-100(Fe). This hybrid material MIL-100(Fe)@BiVO 4 is employed as a photocatalyst for water oxidation reaction and demonstrates higher O 2 production activity in comparison with bare BiVO 4 . The best performance obtained at the optimal mass percentage of MIL-100(Fe) (8.0 wt %) reaches 333.3 μmol h −1 g −1 of the O 2 evolution rate irradiated with visible light, which is almost 4.3 times higher than bare BiVO 4 (77.3 μmol h −1 g −1 ). The enhanced water oxidation performance is due to the more efficient interfacial electron−hole transfer between MIL-100(Fe) and BiVO 4 , which is verified by the results of various photo-electrochemical characterizations. Moreover, the as-prepared composite MIL-100(Fe)@BiVO 4 also displays excellent stability for visible-light-driven water oxidation. This study affords a rational strategy for the controllable construction by loading metal−organic frameworks on a semiconductor surface, which is a good reference for other artificial photosystems.

Activation Strategy of WS2 as an Efficient Photocatalytic Hydrogen Evolution Cocatalyst through Co2+ Doping to Adjust the Highly Exposed Active (100) Facet

“…[ 33 ] The elemental mapping images of the 7% (Co–WS 2 )/CZS sample are shown in Figure 2d–i; Cd, Zn, S, W, and Co elements are homogeneous distribution over the entire area of the 7% (Co–WS 2 )/CZS sample, indicating the uniform loading of the CZS nanoparticles on the surface of Co–WS 2 and no other impurity substances existing in the composite. [ 34 ] The concentration of Co is 0.093 mg L −1 by inductively coupled plasma optical emission spectrometer (ICP–OES) measurement (Table S2, Supporting Information). In a word, all of the results suggest that CZS NPs with uniformly dispersed Co–WS 2 through the electrostatic self‐assembly method have high crystallinity and well‐defined morphology.…”

A Review of MOFs and Their Composites‐Based Photocatalysts: Synthesis and Applications

“…fabricated the MIL‐100(x)@BiVO 4 (x = Fe or Cr) composites photocatalysts for oxygen evolution. [ 297 ] The UV–vis diffuse reflectance spectra exhibited that the as‐prepared MIL‐100(Fe)@BiVO 4 photocatalyst has a wider visible light absorption range than MIL‐100(Cr)@BiVO 4 and BiVO 4 ( Figure a) suggesting the remarkable enhancement of the light absorption ability. As a result, the MIL‐100(Fe)@BiVO 4 photocatalyst also showed a higher photocatalytic O 2 evolution rate than other samples under the visible light irradiation (Figure 14b) due to the rapid photogenerated electron separation and transfer between BiVO 4 and MIL‐100(Fe) (Figure 14c).…”

Porous framework-based hybrid materials for solar-to-chemical energy conversion: from powder photocatalysts to photoelectrodes

“…Unlike for photocatalytic hydrogen production and CO2RR, there have been many studies about the application of MOFs as co-catalysts for photocatalytic water oxidation. For example, Han et al 155 reported the deposition of MIL-100 with different metal nodes (MIL-100(M), where M is Fe or Cr) on a porous BiVO 4 nanoparticle (x%-MIL-100(Fe) @BiVO 4 , where x is the weight percentage of the MOF and can be 2, 4, 8, or 12) (Fig. 13a).…”