Z型电荷分离介导的0D/2D AgVO_(3)/TiO_(2)异质结用于增强光催化CO_(2)还原  

Enhanced photocatalytic CO_(2) conversion over 0D/2D AgVO_(3)/TiO_(2) heterojunctions assisted by Z-scheme charge separation

作　　者：王鋙葶 蒋娟 姚楠 左淦丞 朱文磊 郭秀云 鲜啟鸣 Yuting Wang;Juan Jiang;Nan Yao;Gancheng Zuo;Wenlei Zhu;Xiuyun Guo;Qiming Xian(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)

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing 210023,China [2]Jiangsu Engineering Lab of Water and Soil Eco-Remediation,School of Environment,Nanjing Normal University,Nanjing 210023,China [3]Key Laboratory of Chinese Cuisine Intangible Cultural Heritage Technology Inheritance,School of Tourism and Cuisine,Yangzhou University,Yangzhou 225127,China

出　　处：《Science China Materials》2024年第6期1820-1829,共10页中国科学（材料科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China (22106072 and 42177356);the Fundamental Research Funds for the Central Universities (2022300301);the Natural Science Research Major Project of Jiangsu Higher Education Institutions of China (22KJA610003);the State Key Laboratory of Pollution Control and Resource Reuse Foundation (PCRRF21032);the Open Fund of Key Laboratory of Green Chemical Technology of Fujian Province University (WYKFGCT2022-3);China Postdoctoral Science Foundation (2022M721555);Jiangsu Funding Program for Excellent Postdoctoral Talent (2023ZB081)。

摘　　要：合理利用Z型电荷调节机制是提高光催化CO_(2)还原效率的有效策略.在本工作中,通过将AgVO_(3)量子点(QDs)原位锚定在TiO_(2)纳米片(NSs)上,从而构建了0D/2D AgVO_(3)/TiO_(2)直接Z型异质结光催化剂.TiO_(2)NSs抑制了AgVO_(3)量子点自身的团聚,从而优化了体系的形貌结构.AgVO_(3)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(-)AgVO_(3)/(+)TiO_(2))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AgVO_(3)/TiO_(2)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CO_(2)还原效率(CO,47.61μmol h-1g-1),是原始TiO_(2)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CO_(2)还原催化剂的开发提供了指导.Rationally utilizing Z-scheme charge-regulated mechanisms is an effective strategy to improve photocatalytic CO_(2) reduction efficiency.Herein,AgVO_(3) quantum dots(QDs)are in-situ anchored on TiO_(2) nanosheets(NSs)to construct a 0D/2D AgVO_(3)/TiO_(2) direct Z-scheme heterojunction(DZH).TiO_(2) NSs prevent the self-aggregation of AgVO_(3) QDs,thereby optimizing the morphological structure of the system.AgVO_(3) 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(-)AgVO_(3)/(+)TiO_(2) 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 AgVO_(3)/TiO_(2) nanohybrid exhibits competitive photocatalytic CO_(2) reduction efficiency(47.61μmol h-1 g-1 for CO),without any cocatalyst,which is 20.97 times higher than pristine TiO_(2) NSs.This work presents a rational design for a DZH and guides efficient photocatalytic CO_(2) reduction catalyst ex-ploration.

关 键 词：photocatalytic CO_(2)reduction direct Z-scheme het-erojunction internal interfacial electric field TiO2 nanosheets AgVO_(3)quantum dots 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]