In Situ Grown Monolayer N‐Doped Graphene on CdS Hollow Spheres with Seamless Contact for Photocatalytic CO₂ Reduction

Abstract

Photocatalytic CO2 reduction is an effective way to simultaneously mitigate the greenhouse effect and the energy crisis. Herein, CdS hollow spheres, on which monolayer nitrogen‐doped graphene is in situ grown by chemical vapor deposition, are applied for realizing effective photocatalytic CO2 reduction. The constructed photocatalyst possesses a hollow interior for strengthening light absorption, a thin shell for shortening the electron migration distance, tight adhesion for facilitating separation and transfer of carriers, and a monolayer nitrogen‐doped graphene surface for adsorbing and activating CO2 molecules. Achieving seamless contact between a photocatalyst and a cocatalyst, which provides a pollution‐free and large‐area transport interface for carriers, is an effective strategy for improving the photocatalytic CO2 reduction performance. Therefore, the yield of CO and CH4, as dominating products, can be increased by four and five times than that of pristine CdS hollow spheres, respectively. This work emphasizes the importance of contact interface regulation between the photocatalyst and the cocatalyst and provides new ideas for the seamless and large‐area contact of heterojunctions.

Graphdiyne: A Brilliant Hole Accumulator for Stable and Efficient Planar Perovskite Solar Cells

“…Once they are combined, the electrons tend to transport from GDY to PSK, whereas the holes tend to transport from PSK to GDY. [ 24 ] Similarly, under illumination, the Fermi level of individual PSK further shifts down to −4.80 eV, whereas the Fermi level of individual GDY hardly changes (−4.59 eV). Therefore, the tendency of the hole transport from PSK to GDY becomes violent with the excitation of illumination.…”

Atomic‐Level Reactive Sites for Semiconductor‐Based Photocatalytic CO2 Reduction

“…The sulfur vacancy can also be introduced in ZnS crystal by doping with Ni and Cd . These sulfur vacancies can serve as CO 2 adsorption sites and photogenerated electrons trapping sites to facilitate charge separation and transfer …”

A Novel Earth‐Abundant W‐WC Heterojunction as Efficient Co‐Catalyst for Enhanced Photocatalytic H2 Evolution

“…So, exploring and developing earth-abundant co-catalysts with high efficiency and environmental friendly have become the research focus. [16][17][18][19][20][21][22][23][24] Tungsten carbide (WC) is a famous earth-abundant material with high hardness, high wear resistance, high melting point, and high catalytic activity, and has been widely used in cutting tools, electronics, medical equipment, catalysts and other fields. [25,26] At present, there are many methods for preparing WC, including ball milling, [27] microwave-assisted synthesis, [28] sol-gel, [29] hydrothermal [30] etc.…”