Internal electric field modulation by copper vacancy concentration of cuprous sulfide nanosheets for enhanced selective CO2 photoreduction

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外文摘要：Although the internal electric field(IEF)of photocatalysts is acknowledged as a potent driving force for photocharge separation,modulating the IEF intensity to achieve enhanced photocatalytic performances remains a challenge.Herein,cuprous sulfide nanosheets with different Cu vacancy concentration were employed to study IEF modulation and corresponding direct charge transfer.Among the samples,Cu1.8S nanosheets possessed intensified IEF intensity compared with those of Cu2S and Cu1.95S nanosheets,suggesting that an enhanced IEF intensity could be achieved by introducing more Cu vacan-cies.This intensified IEF of Cui.8S nanosheets induced numerous photogenerated electrons to migrate to its surface,and the dissociative electrons were then captured by Cu vacancies,resulting in efficient charge separation spatially.In addition,the Cu vacancies on Cu1.8S nanosheets accumulated electrons as active sites to lower the energy barrier of rate-determining step of CO2 photoreduction,leading to the selective conversion of CO2 to CO.Herein,the manipulation of IEF intensity through Cu vacancy con-centration regulation of cuprous sulfide photocatalysts for efficient charge separation has been discussed,providing a scientific strategy to rationally improve photocatalytic performances for solar energy conversion.

外文关键词：

Internal electric field intensityCuprous sulfide photocatalystsCu vacanciesCharge separationSelective CO2 photoreduction

作者：

Xian Shi、Weidong Dai、Xiaoqian Li、Yang Bai、Qin Ren、Yao Lei、Xing'an Dong

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作者单位：

School of Chemistry and Environmental Engineering,Sichuan University of Science & Engineering,Zigong 643000,Sichuan,China

Research Center for Environmental and Energy Catalysis,Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,School of Oil & Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,Sichuan,China

Chongqing Key Laboratory of Photo-Electric Functional Materials,College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,Sichuan,China

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基金：

国家自然科学基金Open Project of Key Laboratory of Green Chemical Engineering Process of Ministry of EducationScientific Research and Innovation Team Program of Sichuan University of Science and Engineering

项目编号：

52200123GCP2022007SUSE652A014

出版年：

2024

DOI：

10.1016/j.jechem.2023.12.034

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.91(4)

参考文献量41