Preparation of Heterojunction Catalysts for Photocatalysis byin‐situSynthesis: What We Should Do Next?

Abstract

The construction of heterojunction is one of the most effective ways to improve the activity of photocatalysts, while in‐situ synthesis technology can provide the most intimate interfacial contact during the preparation of heterojunction. Heterojunction photocatalysts prepared by in‐situ synthesis have shown excellent performance in solar energy conversion and environmental purification. The convenient preparation process is also suitable for large‐scale production. In this review, we summarize the common synthesis methods and characterization techniques for the in‐situ synthesis of heterojunctions, and list the applications of these catalysts in the photocatalytic field. Finally, we discuss the limitations of the current research on in‐situ synthesis and look forward to its great prospects.

Photocatalytic Conversion of CO2 to CO with a p–n Heterojunction Based on Core–Shell β-Ga2O3@CoGa2O4 Nanorods

“…In addition, it can avoid the agglomeration of nanoparticles, ensure their uniform dispersion, and preserve the original structure of the carrier to the greatest extent. 22 To understand the detailed formation process of the core−shell CG/GO heteronanorods, we have schematically illustrated the possible formation mechanism in Figure 1a. The phase composition and crystallinity of the synthesized samples were analyzed using XRD.…”

“…In situ synthesis technology, the synthesis strategy of the material directly epitaxial growth to the carrier, ensures that the epitaxial material nucleated and grown on the surface of the carrier has the best interface between the pollution-free and tight contact. In addition, it can avoid the agglomeration of nanoparticles, ensure their uniform dispersion, and preserve the original structure of the carrier to the greatest extent . To understand the detailed formation process of the core–shell CG/GO heteronanorods, we have schematically illustrated the possible formation mechanism in Figure a.…”

Enhanced Generation of Reactive Oxygen Species via Piezoelectrics based on p–n Heterojunctions with Built-In Electric Field

“…The BiOI/BiVO 4 interface displayed a high degree of crystalline lattice match, indicating strong coherence across the interface through the bridging effect of Bi 3+ . This closely coupled interface is widely used as a criterion for the formation of heterostructures . The binding energy of elements in heterostructures, including their photoluminescence spectra, often differs from that of independent components, which will be discussed in the following paragraphs.…”

In Situ Etching–Hydrolysis Strategy To Construct an In-Plane ZnIn2S4/In(OH)3 Heterojunction with Enhanced CO2 Photoreduction Performance

“…The in-plane 2D heterojunctions possess both a large specific surface area and a clearly defined linear interface within the plane. Generally, an intimate heterojunction interface is of great importance to improve the separation efficiency of photogenerated carriers. − Establishing precise atomic contacts at the interface will construct favorable electron transfer channels, thus facilitating charge transfer. − The in situ etching method is a top-down strategy for heterojunction preparation, which involves conversion of a portion of the material into other substances. − This method can generate lateral heterojunctions with seamlessly stitched interfaces via chemical bonding . However, creating a feasible synthesis approach to achieve in-plane epitaxial growth with a sub-nanometer-scale interface continues to be a considerable challenge …”