Advances in photochemical deposition for controllable synthesis of heterogeneous catalysts

Abstract

Photochemical deposition has been attracting increasing attention for preparing nano-catalysts due to its mild reaction conditions, simplicity, green and safe characteristics, and potential for various applications in photocatalysis, thermal catalysis,...

Light as an Orthogonal Synthetic Parameter in Metal Nanoparticle Growth

“…Such efforts to expand the scope of shape control in hot electron-driven metal nanoparticle growth may benefit from existing synthetic strategies in the well-studied field of photochemical metal nanoparticle deposition onto semiconductor materials, which often relies on careful control of surface adsorbates, defects, and charge carrier concentrations. 78,79 In contrast, for syntheses where the dominant LSPR-driven process is the oxidation of a surface-adsorbed reducing agent by hot holes and subsequent reduction of metal ions by resulting thermalized electrons, a broader scope of shape control has been achieved. In these cases, visible light illumination is an orthogonal parameter, serving to provide the energy necessary to overcome the activation barrier of a thermodynamically feasible but kinetically slow reaction between metal ions and a weak chemical reducing agent.…”

“…For example, the adsorption of molecules with hole-scavenging or electron-relay capabilities that are pH tunable and/or bind in a facet-specific manner could provide a mechanism of finely tuning metal ion reduction rates and thus nanoparticle shape. Such efforts to expand the scope of shape control in hot electron-driven metal nanoparticle growth may benefit from existing synthetic strategies in the well-studied field of photochemical metal nanoparticle deposition onto semiconductor materials, which often relies on careful control of surface adsorbates, defects, and charge carrier concentrations. , …”

A review on the photochemical synthesis of atomically dispersed catalysts

“…37 After decades of development, photodeposition has also been found to be useful for preparing supported catalysts for other reactions apart from just photocatalysis, as has been reviewed lately. 38–40 Due to its mild, simple, green, and safe reaction conditions, photodeposition methods can enable the simple, rapid, and scalable production of metal nanoparticles without deploying dangerous reagents or complex equipment, thereby exhibiting high potential for application purposes.…”

Fabrication of Ultra-Fine Ag NPs on TiO2 Thin Films by Alcohol-Assisted Photodeposition Process for Photocatalysis-Related Applications

“…Additional elements such as Schottky junctions, adsorption, and competing reactions also play a role in the photodeposition process [ 24 ]. Semiconductors not only generate charge carriers but also act as a platform for the nucleation and growth of metal nanoparticles [ 25 ]. The formation of Schottky and ohmic junctions between the metal and semiconductor can promote effective electron transfer, concentrating photogenerated electrons at the nucleation sites [ 26 ].…”