ZnSe Nanorods–CsSnCl₃ Perovskite Heterojunction Composite for Photocatalytic CO₂ Reduction

Abstract

Utilizing sunlight to convert CO 2 into chemical fuels could simultaneously address the greenhouse effect and fossil fuel crisis. ZnSe nanocrystals are promising candidates for photocatalysis because of their low toxicity and excellent photoelectric properties. However, pristine ZnSe generally has low catalytic activities due to serious charge recombination and the lack of efficient catalytic sites for CO 2 reduction. Herein, a ZnSe nanorods−CsSnCl 3 perovskite (ZnSe−CsSnCl 3 ) type II heterojunction composite is designed and prepared for photocatalytic CO 2 reduction. The ZnSe−CsSnCl 3 type II heterojunction composite exhibits enhanced photocatalytic activity for CO 2 reduction with respect to pristine ZnSe nanorods. The experimental characterizations and theoretical calculations reveal that the efficient charge separation and lowered free energy of CO 2 reduction facilitate the CO 2 conversion on the ZnSe−CsSnCl 3 heterojunction composite. This work presents a type II heterojunction composite photocatalyst based on ecofriendly metal chalcogenides and metal halide perovskites. Our study has also promoted the understanding of the CO 2 reduction mechanisms on perovskite nanocrystals, which could be valuable for the development of metal halide perovskite photocatalysts.

Ni–Co Bimetallic Hydroxide Nanosheet Arrays Anchored on Graphene for Adsorption‐Induced Enhanced Photocatalytic CO2 Reduction

“…Furthermore, severe electron/hole recombination and slow surface reaction kinetics limit the photocatalytic performance. [5,6] Therefore, the focus of the current research is to design materials that can reduce the activation energy required for reduction reactions, increase the amount of photogenerated electrons, and accelerate the separation of electrons and holes to improve CO 2 reduction efficiency and product selectivity. [7,8] Among the developed photocatalysts, transition metal hydroxides, as noble-metal-free cocatalysts, are attractive because they are naturally abundant, cost effective, and have high CO 2 adsorption capacity.…”

Tailoring defect-type and ligand-vacancies in Zr(iv) frameworks for CO2 photoreduction

“…3b). 57 Meanwhile, the arc radius in the electrochemical impedance spectroscopy (EIS) Nyquist plots (Fig. 3c) changes with the ligand vacancy and defect nature in the MOFs, as UiO-66-NH 2 -ML-100 has the smallest semicircular radius, manifesting the lowest charge transfer resistance in defect MOFs.…”

Facile synthesis of compact CdS–CuS heterostructures for optimal CO2-to-syngas photoconversion

“…The reduced exciton lifetime confirmed accelerated photoexcitation dissociation in CdS, suggesting that electrons transported from CdS to CuS via a nonradiative quenching manner. 61,62 Additionally, the transient photocurrent response (Fig. S11 †) indicated that CdS-CuS-2 exhibited a higher photocurrent over CdS/CuS-2 and CuS, which suggested a superior carrier separation ability and more efficient charge transfer in CdS-CuS-2.…”