95 / 2019-11-01 22:03:33

CARBON-BASED HETEROSTRUCTURES FOR ENERGY STORAGE AND CONVERSION: ARCHITECTURE DESIGN AND IN-SITU SYNTHESIS

CARBON,HETEROSTRUCTURES,ENERGY STORAGE,ENERGY CONVERSION

Heterostructures exhibit fascinating synergistic effect compared to their singular components. However, the structure of substrate and foreign material of the heterostructures show important influence on properties. In this study, we have successfully developed convenient and straightforward methods to prepare of various heterostructures including carbon-based nano-composites. Single atoms, atom dimers[1-3] and nanocrystals (NC)[4] were anchored on 2D graphene/MoS2 as catalysts for electrochemical energy conversion. Besides, MnO@Mn3O4 core@shell nanoparticles embedded in N-doped porous carbon frameworks (MnO@Mn3O4/NPCFs)[5], novel nitrogen-doped few-layered graphene-wrapped TiO2 hierarchical porous hybrid nanosheets (TiO2@NFG HPHNSs) [6] and N, P-Codoped Porous Carbon Sheets/CoP Hybrids [7] were used as anode materials for Lithium, Sodium and Potassium batteries, respectively. These materials were determined by conducting high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and electron energy loss spectroscopy (EELS) valence-state analyses. Moreover, Aberration corrected TEM was also adopted to study the atomic scale in-situ nucleation and growth behavior of twinned NCs and network metallic materials. The process of nucleation was directly observed and amorphous clusters derived growth mechanism was proposed. We believe our work will motivate the rational creation of novel composite structures with elevated properties for a variety of applications.
Our work will motivate the rational creation of novel composite structures on energy storage and conversion.