无表面活性剂定向一维/二维NiZn-LDH异质结实现100%高效选择性光催化CO_(2)还原  

Surfactant-free synthesis of ordered 1D/2D NiZn-LDH heterostructure through oriented attachment for efficient photocatalytic CO_(2)reduction with nearly 100%CO selectivity

作　　者：张庭士 赵鑫 林铭雄 杨碧霞 颜家伟 庄赞勇 于岩 Tingshi Zhang;Xin Zhao;Mingxiong Lin;Bixia Yang;Jiawei Yan;Zanyong Zhuang;Yan Yu(College of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China;Key Laboratory of Advanced Materials Technologies,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]College of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China [2]Key Laboratory of Advanced Materials Technologies,Fuzhou University,Fuzhou 350108,China

出　　处：《Science China Materials》2023年第6期2308-2316,共9页中国科学（材料科学（英文版）

基　　金：financially supported by the National Key Research and Development Program/Key Scientific Issues of Transformative Technology(2020YFA0710303);the National Natural Science Foundation of China(U1905215 and 52072076);Fujian Natural Science Foundation(2022J01554);the Key Project of Science and Technology Innovation of Fujian Provincial Department of Education(2022G02002)。

摘　　要：构建高度定向、有序的一维/二维异质结催化材料是解决能源和环境危机的重要途径.本工作报道了在不添加表面活性剂条件下,纳米层状双金属氢氧化物(NiZn-LDHs)可以在生长过程中自发调控其生长晶面,并通过一种非经典取向结合生长机制,形成高度定向、有序的一维/二维异质结构.定向、有序异质结结构的形成源于一维NiZn-LDH纳米针的(101)面和二维NiZn-LDH纳米片的(100)面之间的晶格匹配.定向、有序异质结结构促使一维基元在二维基元上高度分散,而高度分散的一维NiZn-LDH富含缺陷,具有较强的CO_(2)吸附和活化能力.定向一维/二维异质结强化了一维和二维基元之间的相互作用,可加速光生电子从二维基元向含活性位点一维基元的定向传输,赋予催化材料优异的可见光光催化还原CO_(2)性能(C O的产出速率达16,950μmol g^(-1)h^(-1);CO选择性高达100%).本工作展示了各向异性纳米结构材料可以自发调控其生长行为,为高效、定向、有序的异质结催化材料的设计提供了新的思路.Ordered assembly of anisotropic one-dimensional(1D)and 2D nanomaterials is necessary for preparing delicate heterostructures with close contact to alleviate the energy and environmental crisis.Here,we exploited oriented attachment,a non-classical growth mechanism,as a tool for preparing ordered 1D/2D NiZn layered double hydroxide(NiZn LDH)heterostructures beyond the use of surfactants.Lattice matching between the(101)plane of 1D nanoneedles(NNs)and the(100)plane of 2D nanosheets(NSs)drives the spontaneous ordered assembly of 1D NiZn-LDH NNs on 2D NiZn-LDH NSs.Accordingly,the oxygen-deficient 1D NiZnLDH capable of CO_(2)adsorption is,therefore,well dispersed on the 2D platform.The oriented assembly generates strong and intimate interactions between the 1D and 2D units,enabling the efficient transfer of photogenerated electrons from2D to 1D NiZn-LDH.The oriented 1D/2D NiZn-LDH heterostructure demonstrates superior CO_(2)photoreduction performance under visible light irradiation,with a CO yield rate of 16,950μmol g^(-1)h^(-1)and a 100%CO selectivity.The findings demonstrate that the growth of anisotropic nanomaterials can be tailored for advanced heterostructure design through oriented attachment alone.

关 键 词：纳米结构材料 催化材料 可见光光催化 晶格匹配 异质结 光生电子 生长行为 纳米针 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]