Polarization Induced by Chlorine Defect Engineering in High-Entropy Halide Perovskite to Promote CO Photomethanation.

The Coulomb electric field formed between positive and negative charges always restricts the generation and separation of photo-irradiated electrons and holes, resulting in the limited CO photoreduction performances of catalysts. Herein, the defect engineering and high-entropy strategies are used to regulate the crystallinity of CsNaInCl perovskite materials, thus resulting in an enhanced internal polarization electric field, which overcame the Coulomb electric field and promoting the separation process of charge carriers. Moreover, the CsNa{InPrSmGdTb}Cl with Cl vacancies is prepared using the low-temperature syntheses, which overcame the challenge of extremely high-temperature requirements for high entropy alloy preparation.

Surface-Integrating Oxygen Vacancy and CuO Nanodots Enabling Synergistic Electric Field and Dual Catalytic Sites Boosting CO Photoreduction.

High carrier separation efficiency and rapid surface catalytic reaction are crucial for enhancing catalytic CO photoreduction reaction. Herein, integrated surface decoration strategy with oxygen vacancies (Ov) and anchoring CuO (1 < x < 2) nanodots below 10 nm is realized on BiMoO for promoting CO photoreduction performance. The charge interaction between Ov and anchored CuO enables the formation of enhanced internal electric field, which provides a strong driving force for accelerating the separation of photocharge carriers on the surface of BiMoO (η ≈71%).

Selectivity regulation of CO photoreduction via the electron configuration of active sites on single-atom photocatalysts.

The major challenge in the photocatalytic reduction of CO is to achieve high conversion efficiency while maintaining selectivity for a single product. Photocatalysts containing single-metal Cu with 3d and Zn with 3d on g-CN were prepared using a high-energy ball mill. Single-atom Zn inner electron configuration is stable (3d) and the peripheral empty orbitals act as electron traps to trap photo-generated electrons and improve the efficiency of charge separation; Zn is an active site to enhance the adsorption and activation of CO.

A ball milling method for highly dispersed Ni atoms on g-CN to boost CO photoreduction.

Atomically dispersed active sites can effectively enhance the catalytic activity, but the synthesis of highly dispersed single-atom active sites remains challenging. Herein, we report for the fabrication of single-atom Ni on g-CN (CN) catalysts for photocatalytic CO reduction reaction (CORR) using a high-energy ball milling method. The uniformly loaded single-atomic Ni on the surface of the substrate suggests the improvement of synthetic methods.