Research Article

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2022, 15(1): 255–263

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https://doi.org/10.1007/s12274-021-3468-y

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

Shuqing Xue1,§, Guanhong Wu2,§, Mingzhong Li2, Zihan Liu2, Yuwei Deng2, Wenqian Han2, Xuanyu Lv1, Siyu Wan2, Xiangyun Xi1, Dong Yang1 (✉), and Angang Dong2 (✉)

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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
§ Shuqing Xue and Guanhong Wu contributed equally to this work.

Keywords: assembly, heterostructures, ligand-exchange, MXene, oxygen evolution, supercapacitor
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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/NiFe2O4 and MXene/Fe3O4 heterostructures for high-performance electrocatalytic oxygen evolution and supercapacitors, respectively.
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Generalized assembly of sandwich-like 0D/2D/0D heterostructures with highly exposed surfaces toward superior electrochemical performances. Nano Res. 2022, 15(1): 255–263 https://doi.org/10.1007/s12274-021-3468-y

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