Z型电荷分离介导的0D/2D AgVO3/TiO2异质结用于增强光催化CO2还原

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中文摘要：合理利用Z型电荷调节机制是提高光催化CO2还原效率的有效策略.在本工作中,通过将AgVO3量子点(QDs)原位锚定在TiO2纳米片(NSs)上,从而构建了0D/2D AgVO3/TiO2直接Z型异质结光催化剂.TiO2 NSs抑制了AgVO3量子点自身的团聚,从而优化了体系的形貌结构.AgVO3 QDs增强了复合材料的光吸收能力,从而提高了对太阳光的利用效率.同时,两种单体之间匹配的能带结构和合适的内部界面电场(即(-)AgVO3/(+)TiO2)促进了直接Z型异质结的构建,从而显著促进了光生电子-空穴对的分离,并保持了体系中最高的氧化还原电位.优化后的AgVO3/TiO2复合材料在没有任何助催化剂的情况下,表现出具有竞争力的光催化CO2还原效率(CO,47.61 μmol h-1 g-1),是原始TiO2 NSs的20.97倍.本工作提出了一种直接Z型异质结的合理设计方法,为高效光催化CO2还原催化剂的开发提供了指导.

外文标题：Enhanced photocatalytic CO2 conversion over 0D/2D AgVO3/TiO2 heterojunctions assisted by Z-scheme charge separation

外文摘要：Rationally utilizing Z-scheme charge-regulated mechanisms is an effective strategy to improve photocatalytic CO2 reduction efficiency.Herein,AgVO3 quantum dots(QDs)are in-situ anchored on TiO2 nanosheets(NSs)to construct a 0D/2D AgVO3/TiO2 direct Z-scheme heterojunction(DZH).TiO2 NSs prevent the self-aggregation of AgVO3 QDs,thereby optimizing the morphological structure of the system.AgVO3 QDs enhance the optical absorption capacity of the nanohy-brids,thus improving the efficiency of sunlight utilization.Meanwhile,matched energy band structures and the suitable internal interfacial electric field(-)AgVO3/(+)TiO2 facilitate the construction of a DZH,significantly boosting the separa-tion of photogenerated electron-hole pairs and maintaining the highest redox potential in the system.The optimized AgVO3/TiO2 nanohybrid exhibits competitive photocatalytic CO2 reduction efficiency(47.61 pmol h-1 g-1 for CO),without any cocatalyst,which is 20.97 times higher than pristine TiO2 NSs.This work presents a rational design for a DZH and guides efficient photocatalytic CO2 reduction catalyst ex-ploration.

外文关键词：

photocatalytic CO2 reductiondirect Z-scheme het-erojunctioninternal interfacial electric fieldTiO2 nanosheetsAgVO3 quantum dots

作者：

王鋙葶、蒋娟、姚楠、左淦丞、朱文磊、郭秀云、鲜啟鸣

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作者单位：

State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing 210023,China

Jiangsu Engineering Lab of Water and Soil Eco-Remediation,School of Environment,Nanjing Normal University,Nanjing 210023,China

Key Laboratory of Chinese Cuisine Intangible Cultural Heritage Technology Inheritance,School of Tourism and Cuisine,Yangzhou University,Yangzhou 225127,China

关键词：

photocatalytic CO2 reduction direct Z-scheme het-erojunction internal interfacial electric field TiO2 nanosheets AgVO3 quantum dots

基金：

National Natural science Foundation of ChinaNational Natural science Foundation of ChinaFundamental Research Funds for the Central UniversitiesNatural Science Research Major Project of Jiangsu Higher Education Institutions of ChinaState Key Laboratory of Pollution Control and Resource Reuse FoundationOpen Fund of Key Laboratory of Green Chemical Technology of Fujian Province UniversityChina Postdoctoral Science FoundationJiangsu Funding Program for Excellent Postdoctoral Talent

项目编号：

2210607242177356202230030122KJA610003PCRRF21032WYKF-GCT2022-32022M7215552023ZB081

出版年：

2024

DOI：

10.1007/s40843-024-2907-9

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(6)