Heterogeneous Hollow Multi‐Shelled Structures with Amorphous‐Crystalline Outer‐Shells for Sequential Photoreduction of CO₂

Abstract

Constructing delicate nano-/microreactors with tandem active sites in hierarchical architectures is a promising strategy for designing photocatalysts to realize the challenging but attractive CO 2 reduction. Herein, hollow multi-shelled structure (HoMS) based microreactors with spatial ordered hetero-shells are fabricated, which achieve two-step CO 2 -to-CH 4 photoreduction. The multiple inner CeO 2 shells increase the number of active catalytic sites to ensure efficient firststep reaction for generating CO, along with enriching the local CO concentration. The second-step CO-to-CH 4 reaction is consequently induced by amorphous TiO 2 (A-TiO 2 ) composites on the adjacent outer-most shell, thus realizing the CO 2 -to-CH 4 conversion capability using one CeO 2 @CeO 2 /A-TiO 2 HoMS. In-depth explorations in the microreactors provide compositional, structural, and interfacial guidance for engineering HoMS-based microreactors with temporally-spatially ordered shells toward efficient tandem catalysis.

Toward a Comprehensive Understanding of Amorphous Photocatalysts: Fundamental Hypotheses and Applications in CO2 Photoreduction

“…Wang et al produced carbondoped amorphous TiO 2 for efficient catalytic CO 2 conversion in another investigation. [103] The carbon dopant has the potential to reduce the band gap, leading to superior solar and visiblelight responsiveness. Stable CO 2 molecules can be adsorbed and chemically activated much more readily to the amorphous structure and large specific surface area.…”

Steering CO2electroreduction selectivity towards CH4and C2H4on a tannic acid-modified Cu electrode

“…are more desired with higher economic value since hydrocarbons such as CH 4 and C 2 H 4 are attractive due to their easy transport, convenient storage and high energy value. 13 However, it is difficult to tailor the selectivity of hydrocarbons because of multiple reaction pathways and the competing hydrogen evolution reaction (HER) in the CO 2 RR. In the process of the CO 2 RR on Cu catalysts, there are two significant factors having crucial effects on the selectivity of hydrocarbons.…”

Ag-doped Pd nano-dendritic for promoting the electrocatalytic oxidation of ethylene to ethylene glycol

“…[33][34][35][36] In this work, a simple electrochemical deposition method was used to construct a Pd nano-dendritic catalyst on carbon paper support, while the addition of AgNO 3 to the Pd electrodeposition solution was employed to incorporate Ag into Pd nano-dendritic catalyst. 37,38 The Pd-Ag catalyst shows improved catalytic performance in the electrochemical oxidation of ethylene to EG. Using density functional theory (DFT), we uncover that Ag as a dopant not only effectively reduces the reaction barrier but also facilitates the desorption of EG.…”