Boosted CO2 Photoreduction Performance by CdSe Nanoplatelets via Se Vacancy Engineering

Boosted CO2 Photoreduction Performance by CdSe Nanoplatelets via Se Vacancy Engineering

Abstract 2D metal‐chalcogenide nanoplatelets (NPLs) exhibit promising photocatalysis properties due to their ultrathin morphology, high surface‐to‐volume ratio, and enhanced in‐plane electron transport mobility. However, NPLs, especially cadmium chalcogenides, encounter challenges in CO2 photoreduct...

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Bibliographic Details
Main Authors: Huanhuan Luo, Xuanzhao Lu, Yue Cao, Zhaoyuan Lyu, Shichao Ding, Yuehe Lin, Yang Zhou, Wenlei Zhu, Yuanyuan Wang
Format: Article
Language:English
Published: Wiley 2025-03-01
Series:Advanced Science
Subjects:
CdSe NPLs
CO2 reduction
photocatalysis
Se vacancies
surface engineering
Online Access:https://doi.org/10.1002/advs.202413684
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Summary:Abstract 2D metal‐chalcogenide nanoplatelets (NPLs) exhibit promising photocatalysis properties due to their ultrathin morphology, high surface‐to‐volume ratio, and enhanced in‐plane electron transport mobility. However, NPLs, especially cadmium chalcogenides, encounter challenges in CO2 photoreduction due to insufficient solar energy utilization and fast recombination of photogenerated charge carriers. Defect engineering offers a potential solution but often encounters difficulties maintaining structural integrity, mechanical stability, and electrical conductivity. Herein, by taking two monolayers (2ML) CdSe NPLs as a model system, selenium (Se) vacancies confined in atomic layers can enhance charge separation and conductivity. A straightforward approach to create Se vacancies in various monolayers CdSe NPLs (2, 4, and 5ML) has been developed, enabling efficient CO2 photoreduction with a 4‐fold increase in CO generation compared to their defect‐free counterparts. Significantly, accounting for higher charge density and efficient carrier transport due to Se vacancies, defective 2ML CdSe NPLs (VSe‐2ML CdSe) exhibit CO evolution performance up to 2557.5 µmol g−¹ h−¹ with no significant decay over 5 h, which is an order of magnitude higher than that of common semiconductor catalysts. This study establishes a practical way to design advanced 2D semiconductor photocatalysts to achieve efficient CO2 photoreduction via defect engineering.
ISSN:2198-3844

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