Praseodymium Oxide Improving the Activity of a Silver-Loaded Calcium Titanate Photocatalyst for Carbon Dioxide Reduction with Water

Abstract

Heterogeneous photocatalytic CO2 reduction with water has attracted great attention. Although the addition of Ag nanoparticles (NPs) as a cocatalyst on a semiconductor photocatalyst has been known to improve both the photocatalytic activity and reaction selectivity for CO2 reduction, the addition of Pr as Pr6O11 species on the surface of an Ag-loaded CaTiO3 (CTO) photocatalyst further improved the photocatalytic activity. The different calcination temperatures for the sample preparation changed the state of Pr species, and it strongly influenced the photocatalytic performance. The Pr6O11 species was found to be loaded between the CTO surface and Ag NPs on the Ag/Pr/CTO photocatalyst, proposing that it improves the electron migration from the CTO photocatalyst to Ag NPs via the Pr6O11 layer.

Strategies to Improve the Activity of Silver–loaded Calcium Titanate Crystal Photocatalyst for Photocatalytic Reduction of Carbon Dioxide with Water

“…2). [31] Construction of the electron transport path is an efficient method to increase the reductive reaction rate and also reduces recombination of electron hole pairs. Core-shell structure has been recognized to inhibit the reverse reaction on the core cocatalyst.…”

“…[A] The STEM and EDX line analysis about an Ag/Pr/CTO sample. Reprinted with permission from Ref [31]…”

Accelerating Charge Separation and CO2 Photoreduction in Aqueous Phase under Visible Light with Ru Nanoparticles Loaded on Ga-Doped NiTiO3 in a Batch Photoreactor

“…Heterogeneous photocatalytic CO 2 conversion can be a potential future pathway for producing large-scale storable solar fuels from renewable resources. − The development of photocatalysts with high activity and selectivity for CO 2 reduction under visible light and their compatibility with a nonsacrificial water solvent system is critical to the progress of such solar fuel technologies. In recent years, perovskite oxides have emerged as promising semiconductor-based photocatalytic materials owing to their versatile properties, functionality, and stability. − In particular, structurally stable titanate perovskites ATiO 3 (where A = Sr, Ca, Ba, Ni, and Pb) have been studied extensively as photocatalysts for the CO 2 reduction reaction (CO 2 RR). − However, existing ATiO 3 -type perovskites face three primary challenges. First, the wide band gap (E g ) of ATiO 3 -type perovskites limits light absorption at UV wavelengths.…”

Surface gallium oxide hydroxide species adsorbing carbon dioxide to enhance the photocatalytic activity of silver-loaded calcium titanate for carbon dioxide reduction with water

“…Especially, an Ag/CTO photocatalyst was demonstrated to promote CO 2 reduction with water to form CO selectively. 3,4 So far, we have developed some modification strategies, for example, modification of an Ag NP cocatalyst with other metal oxides such as Co 3 O 4 5 and addition of a Pr 6 O 11 layer, 6 where they interacted with the CTO photocatalyst and Ag NPs and contributed to the electron transfer or stabilization of Ag NPs, and modification with a Ga 2 O 3 photoabsorber to provide additional photoexcited carriers to the Ag/CTO photocatalyst. 7…”