Generalized assembly of sandwich-like 0D/2D/0D heterostructures with highly exposed surfaces toward superior electrochemical performances  

作　　者：Shuqing Xue Guanhong Wu Mingzhong Li Zihan Liu Yuwei Deng Wenqian Han Xuanyu Lv Siyu Wan Xiangyun Xi Dong Yang Angang Dong 

机构地区：[1]State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science,Fudan University,Shanghai 200438,China [2]Collaborative Innovation Center of Chemistry for Energy Materials,Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,Department of Chemistry,Fudan University,Shanghai 200438,China

出　　处：《Nano Research》2022年第1期255-263,共9页纳米研究（英文版）

基　　金：support from the National Natural Science Foundation of China(NSFC)(Nos.22025501,21872038,21733003,51773042,and 51973040);the National Key R&D Program of China(Nos.2020YFB1505803 and 2017YFA0207303);Foshan Science and Technology Innovation Program(No.2017IT100121).

摘　　要：Heterostructures composed of two-dimensional(2D)nanosheets and zero-dimensional(0D)nanoparticles(NPs)have attracted increasing attention because of the synergy arising from the coupling interactions between the two mixed-dimensional components.Despite recent advances,it remains a challenge to fabricate 2D/0D heterostructures with clean and accessible surfaces,which is highly desirable for the diversity of catalytic,sensing,and energy storage applications.Herein,we report a generalized methodology that enables the facile assembly of sandwich-like 0D/2D/0D heterostructures with facilitated mass-transport channels and exposed surface active sites.A ligand-exchange strategy with HBF4 is employed to strip off the surface-coating ligands of colloidal NPs,rendering them positively charged and dispersible in polar solvents.This allows subsequent electrostatic assembly of NPs with oppositely charged 2D nanosheets to afford sandwich-like 0D/2D/0D heterostructures.The barely covered surfaces and the advantageous architectures of such sandwich-like 0D/2D/0D heterostructures induce the desired synergistic effect,making them particularly suitable for electrochemical energy storage and conversion.We demonstrate this by employing MXene/NiFe_(2)O_(4) and MXene/Fe3O4 heterostructures for high-performance electrocatalytic oxygen evolution and supercapacitors,respectively.

关 键 词：ASSEMBLY HETEROSTRUCTURES LIGAND-EXCHANGE MXene oxygen evolution SUPERCAPACITOR 

分 类 号：TB383[一般工业技术—材料科学与工程]